[SCSI] SCSI core: fix leakage of scsi_cmnd's
[linux-2.6] / drivers / scsi / ide-scsi.c
1 /*
2  * linux/drivers/scsi/ide-scsi.c        Version 0.9             Jul   4, 1999
3  *
4  * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
5  */
6
7 /*
8  * Emulation of a SCSI host adapter for IDE ATAPI devices.
9  *
10  * With this driver, one can use the Linux SCSI drivers instead of the
11  * native IDE ATAPI drivers.
12  *
13  * Ver 0.1   Dec  3 96   Initial version.
14  * Ver 0.2   Jan 26 97   Fixed bug in cleanup_module() and added emulation
15  *                        of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
16  *                        to Janos Farkas for pointing this out.
17  *                       Avoid using bitfields in structures for m68k.
18  *                       Added Scatter/Gather and DMA support.
19  * Ver 0.4   Dec  7 97   Add support for ATAPI PD/CD drives.
20  *                       Use variable timeout for each command.
21  * Ver 0.5   Jan  2 98   Fix previous PD/CD support.
22  *                       Allow disabling of SCSI-6 to SCSI-10 transformation.
23  * Ver 0.6   Jan 27 98   Allow disabling of SCSI command translation layer
24  *                        for access through /dev/sg.
25  *                       Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
26  * Ver 0.7   Dec 04 98   Ignore commands where lun != 0 to avoid multiple
27  *                        detection of devices with CONFIG_SCSI_MULTI_LUN
28  * Ver 0.8   Feb 05 99   Optical media need translation too. Reverse 0.7.
29  * Ver 0.9   Jul 04 99   Fix a bug in SG_SET_TRANSFORM.
30  * Ver 0.91  Jun 10 02   Fix "off by one" error in transforms
31  * Ver 0.92  Dec 31 02   Implement new SCSI mid level API
32  */
33
34 #define IDESCSI_VERSION "0.92"
35
36 #include <linux/module.h>
37 #include <linux/config.h>
38 #include <linux/types.h>
39 #include <linux/string.h>
40 #include <linux/kernel.h>
41 #include <linux/mm.h>
42 #include <linux/ioport.h>
43 #include <linux/blkdev.h>
44 #include <linux/errno.h>
45 #include <linux/hdreg.h>
46 #include <linux/slab.h>
47 #include <linux/ide.h>
48 #include <linux/scatterlist.h>
49 #include <linux/delay.h>
50
51 #include <asm/io.h>
52 #include <asm/bitops.h>
53 #include <asm/uaccess.h>
54
55 #include <scsi/scsi.h>
56 #include <scsi/scsi_cmnd.h>
57 #include <scsi/scsi_device.h>
58 #include <scsi/scsi_host.h>
59 #include <scsi/scsi_tcq.h>
60 #include <scsi/sg.h>
61
62 #define IDESCSI_DEBUG_LOG               0
63
64 typedef struct idescsi_pc_s {
65         u8 c[12];                               /* Actual packet bytes */
66         int request_transfer;                   /* Bytes to transfer */
67         int actually_transferred;               /* Bytes actually transferred */
68         int buffer_size;                        /* Size of our data buffer */
69         struct request *rq;                     /* The corresponding request */
70         u8 *buffer;                             /* Data buffer */
71         u8 *current_position;                   /* Pointer into the above buffer */
72         struct scatterlist *sg;                 /* Scatter gather table */
73         int b_count;                            /* Bytes transferred from current entry */
74         struct scsi_cmnd *scsi_cmd;             /* SCSI command */
75         void (*done)(struct scsi_cmnd *);       /* Scsi completion routine */
76         unsigned long flags;                    /* Status/Action flags */
77         unsigned long timeout;                  /* Command timeout */
78 } idescsi_pc_t;
79
80 /*
81  *      Packet command status bits.
82  */
83 #define PC_DMA_IN_PROGRESS              0       /* 1 while DMA in progress */
84 #define PC_WRITING                      1       /* Data direction */
85 #define PC_TRANSFORM                    2       /* transform SCSI commands */
86 #define PC_TIMEDOUT                     3       /* command timed out */
87 #define PC_DMA_OK                       4       /* Use DMA */
88
89 /*
90  *      SCSI command transformation layer
91  */
92 #define IDESCSI_TRANSFORM               0       /* Enable/Disable transformation */
93 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
94
95 /*
96  *      Log flags
97  */
98 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
99
100 typedef struct ide_scsi_obj {
101         ide_drive_t             *drive;
102         ide_driver_t            *driver;
103         struct gendisk          *disk;
104         struct Scsi_Host        *host;
105
106         idescsi_pc_t *pc;                       /* Current packet command */
107         unsigned long flags;                    /* Status/Action flags */
108         unsigned long transform;                /* SCSI cmd translation layer */
109         unsigned long log;                      /* log flags */
110 } idescsi_scsi_t;
111
112 static DECLARE_MUTEX(idescsi_ref_sem);
113
114 #define ide_scsi_g(disk) \
115         container_of((disk)->private_data, struct ide_scsi_obj, driver)
116
117 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
118 {
119         struct ide_scsi_obj *scsi = NULL;
120
121         down(&idescsi_ref_sem);
122         scsi = ide_scsi_g(disk);
123         if (scsi)
124                 scsi_host_get(scsi->host);
125         up(&idescsi_ref_sem);
126         return scsi;
127 }
128
129 static void ide_scsi_put(struct ide_scsi_obj *scsi)
130 {
131         down(&idescsi_ref_sem);
132         scsi_host_put(scsi->host);
133         up(&idescsi_ref_sem);
134 }
135
136 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
137 {
138         return (idescsi_scsi_t*) (&host[1]);
139 }
140
141 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
142 {
143         return scsihost_to_idescsi(ide_drive->driver_data);
144 }
145
146 /*
147  *      Per ATAPI device status bits.
148  */
149 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
150
151 /*
152  *      ide-scsi requests.
153  */
154 #define IDESCSI_PC_RQ                   90
155
156 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
157 {
158         while (bcount--)
159                 (void) HWIF(drive)->INB(IDE_DATA_REG);
160 }
161
162 static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
163 {
164         while (bcount--)
165                 HWIF(drive)->OUTB(0, IDE_DATA_REG);
166 }
167
168 /*
169  *      PIO data transfer routines using the scatter gather table.
170  */
171 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
172 {
173         int count;
174         char *buf;
175
176         while (bcount) {
177                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
178                         printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
179                         idescsi_discard_data (drive, bcount);
180                         return;
181                 }
182                 count = min(pc->sg->length - pc->b_count, bcount);
183                 if (PageHighMem(pc->sg->page)) {
184                         unsigned long flags;
185
186                         local_irq_save(flags);
187                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) + pc->sg->offset;
188                         drive->hwif->atapi_input_bytes(drive, buf + pc->b_count, count);
189                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
190                         local_irq_restore(flags);
191                 } else {
192                         buf = page_address(pc->sg->page) + pc->sg->offset;
193                         drive->hwif->atapi_input_bytes(drive, buf + pc->b_count, count);
194                 }
195                 bcount -= count; pc->b_count += count;
196                 if (pc->b_count == pc->sg->length) {
197                         pc->sg++;
198                         pc->b_count = 0;
199                 }
200         }
201 }
202
203 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
204 {
205         int count;
206         char *buf;
207
208         while (bcount) {
209                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
210                         printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
211                         idescsi_output_zeros (drive, bcount);
212                         return;
213                 }
214                 count = min(pc->sg->length - pc->b_count, bcount);
215                 if (PageHighMem(pc->sg->page)) {
216                         unsigned long flags;
217
218                         local_irq_save(flags);
219                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) + pc->sg->offset;
220                         drive->hwif->atapi_output_bytes(drive, buf + pc->b_count, count);
221                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
222                         local_irq_restore(flags);
223                 } else {
224                         buf = page_address(pc->sg->page) + pc->sg->offset;
225                         drive->hwif->atapi_output_bytes(drive, buf + pc->b_count, count);
226                 }
227                 bcount -= count; pc->b_count += count;
228                 if (pc->b_count == pc->sg->length) {
229                         pc->sg++;
230                         pc->b_count = 0;
231                 }
232         }
233 }
234
235 /*
236  *      Most of the SCSI commands are supported directly by ATAPI devices.
237  *      idescsi_transform_pc handles the few exceptions.
238  */
239 static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
240 {
241         u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd;
242         char *atapi_buf;
243
244         if (!test_bit(PC_TRANSFORM, &pc->flags))
245                 return;
246         if (drive->media == ide_cdrom || drive->media == ide_optical) {
247                 if (c[0] == READ_6 || c[0] == WRITE_6) {
248                         c[8] = c[4];            c[5] = c[3];            c[4] = c[2];
249                         c[3] = c[1] & 0x1f;     c[2] = 0;               c[1] &= 0xe0;
250                         c[0] += (READ_10 - READ_6);
251                 }
252                 if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
253                         unsigned short new_len;
254                         if (!scsi_buf)
255                                 return;
256                         if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL)
257                                 return;
258                         memset(atapi_buf, 0, pc->buffer_size + 4);
259                         memset (c, 0, 12);
260                         c[0] = sc[0] | 0x40;
261                         c[1] = sc[1];
262                         c[2] = sc[2];
263                         new_len = sc[4] + 4;
264                         c[8] = new_len;
265                         c[7] = new_len >> 8;
266                         c[9] = sc[5];
267                         if (c[0] == MODE_SELECT_10) {
268                                 atapi_buf[1] = scsi_buf[0];     /* Mode data length */
269                                 atapi_buf[2] = scsi_buf[1];     /* Medium type */
270                                 atapi_buf[3] = scsi_buf[2];     /* Device specific parameter */
271                                 atapi_buf[7] = scsi_buf[3];     /* Block descriptor length */
272                                 memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4);
273                         }
274                         pc->buffer = atapi_buf;
275                         pc->request_transfer += 4;
276                         pc->buffer_size += 4;
277                 }
278         }
279 }
280
281 static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
282 {
283         u8 *atapi_buf = pc->buffer;
284         u8 *sc = pc->scsi_cmd->cmnd;
285         u8 *scsi_buf = pc->scsi_cmd->request_buffer;
286
287         if (!test_bit(PC_TRANSFORM, &pc->flags))
288                 return;
289         if (drive->media == ide_cdrom || drive->media == ide_optical) {
290                 if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) {
291                         scsi_buf[0] = atapi_buf[1];             /* Mode data length */
292                         scsi_buf[1] = atapi_buf[2];             /* Medium type */
293                         scsi_buf[2] = atapi_buf[3];             /* Device specific parameter */
294                         scsi_buf[3] = atapi_buf[7];             /* Block descriptor length */
295                         memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8);
296                 }
297                 if (pc->c[0] == INQUIRY) {
298                         scsi_buf[2] |= 2;                       /* ansi_revision */
299                         scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */
300                 }
301         }
302         if (atapi_buf && atapi_buf != scsi_buf)
303                 kfree(atapi_buf);
304 }
305
306 static void hexdump(u8 *x, int len)
307 {
308         int i;
309
310         printk("[ ");
311         for (i = 0; i < len; i++)
312                 printk("%x ", x[i]);
313         printk("]\n");
314 }
315
316 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
317 {
318         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
319         idescsi_pc_t   *pc;
320         struct request *rq;
321         u8             *buf;
322
323         /* stuff a sense request in front of our current request */
324         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
325         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
326         buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
327         if (pc == NULL || rq == NULL || buf == NULL) {
328                 if (pc) kfree(pc);
329                 if (rq) kfree(rq);
330                 if (buf) kfree(buf);
331                 return -ENOMEM;
332         }
333         memset (pc, 0, sizeof (idescsi_pc_t));
334         memset (buf, 0, SCSI_SENSE_BUFFERSIZE);
335         ide_init_drive_cmd(rq);
336         rq->special = (char *) pc;
337         pc->rq = rq;
338         pc->buffer = buf;
339         pc->c[0] = REQUEST_SENSE;
340         pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
341         rq->flags = REQ_SENSE;
342         pc->timeout = jiffies + WAIT_READY;
343         /* NOTE! Save the failed packet command in "rq->buffer" */
344         rq->buffer = (void *) failed_command->special;
345         pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
346         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
347                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
348                 hexdump(pc->c, 6);
349         }
350         rq->rq_disk = scsi->disk;
351         return ide_do_drive_cmd(drive, rq, ide_preempt);
352 }
353
354 static int idescsi_end_request(ide_drive_t *, int, int);
355
356 static ide_startstop_t
357 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
358 {
359         if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
360                 /* force an abort */
361                 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
362
363         rq->errors++;
364
365         idescsi_end_request(drive, 0, 0);
366
367         return ide_stopped;
368 }
369
370 static ide_startstop_t
371 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
372 {
373 #if IDESCSI_DEBUG_LOG
374         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
375                         ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
376 #endif
377         rq->errors |= ERROR_MAX;
378
379         idescsi_end_request(drive, 0, 0);
380
381         return ide_stopped;
382 }
383
384 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
385 {
386         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
387         struct request *rq = HWGROUP(drive)->rq;
388         idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
389         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
390         struct Scsi_Host *host;
391         u8 *scsi_buf;
392         unsigned long flags;
393
394         if (!(rq->flags & (REQ_SPECIAL|REQ_SENSE))) {
395                 ide_end_request(drive, uptodate, nrsecs);
396                 return 0;
397         }
398         ide_end_drive_cmd (drive, 0, 0);
399         if (rq->flags & REQ_SENSE) {
400                 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
401                 if (log) {
402                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
403                         hexdump(pc->buffer,16);
404                 }
405                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
406                 kfree(pc->buffer);
407                 kfree(pc);
408                 kfree(rq);
409                 pc = opc;
410                 rq = pc->rq;
411                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
412                                         ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
413         } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
414                 if (log)
415                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
416                                         drive->name, pc->scsi_cmd->serial_number);
417                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
418         } else if (rq->errors >= ERROR_MAX) {
419                 pc->scsi_cmd->result = DID_ERROR << 16;
420                 if (log)
421                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
422         } else if (rq->errors) {
423                 if (log)
424                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
425                 if (!idescsi_check_condition(drive, rq))
426                         /* we started a request sense, so we'll be back, exit for now */
427                         return 0;
428                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
429         } else {
430                 pc->scsi_cmd->result = DID_OK << 16;
431                 idescsi_transform_pc2 (drive, pc);
432                 if (log) {
433                         printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number);
434                         if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) {
435                                 printk(", rst = ");
436                                 scsi_buf = pc->scsi_cmd->request_buffer;
437                                 hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen));
438                         } else printk("\n");
439                 }
440         }
441         host = pc->scsi_cmd->device->host;
442         spin_lock_irqsave(host->host_lock, flags);
443         pc->done(pc->scsi_cmd);
444         spin_unlock_irqrestore(host->host_lock, flags);
445         kfree(pc);
446         kfree(rq);
447         scsi->pc = NULL;
448         return 0;
449 }
450
451 static inline unsigned long get_timeout(idescsi_pc_t *pc)
452 {
453         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
454 }
455
456 static int idescsi_expiry(ide_drive_t *drive)
457 {
458         idescsi_scsi_t *scsi = drive->driver_data;
459         idescsi_pc_t   *pc   = scsi->pc;
460
461 #if IDESCSI_DEBUG_LOG
462         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
463 #endif
464         set_bit(PC_TIMEDOUT, &pc->flags);
465
466         return 0;                                       /* we do not want the ide subsystem to retry */
467 }
468
469 /*
470  *      Our interrupt handler.
471  */
472 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
473 {
474         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
475         idescsi_pc_t *pc=scsi->pc;
476         struct request *rq = pc->rq;
477         atapi_bcount_t bcount;
478         atapi_status_t status;
479         atapi_ireason_t ireason;
480         atapi_feature_t feature;
481
482         unsigned int temp;
483
484 #if IDESCSI_DEBUG_LOG
485         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
486 #endif /* IDESCSI_DEBUG_LOG */
487
488         if (test_bit(PC_TIMEDOUT, &pc->flags)){
489 #if IDESCSI_DEBUG_LOG
490                 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet  %lu at %lu\n",
491                                 pc->scsi_cmd->serial_number, jiffies);
492 #endif
493                 /* end this request now - scsi should retry it*/
494                 idescsi_end_request (drive, 1, 0);
495                 return ide_stopped;
496         }
497         if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
498 #if IDESCSI_DEBUG_LOG
499                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
500 #endif /* IDESCSI_DEBUG_LOG */
501                 pc->actually_transferred=pc->request_transfer;
502                 (void) HWIF(drive)->ide_dma_end(drive);
503         }
504
505         feature.all = 0;
506         /* Clear the interrupt */
507         status.all = HWIF(drive)->INB(IDE_STATUS_REG);
508
509         if (!status.b.drq) {
510                 /* No more interrupts */
511                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
512                         printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
513                 local_irq_enable();
514                 if (status.b.check)
515                         rq->errors++;
516                 idescsi_end_request (drive, 1, 0);
517                 return ide_stopped;
518         }
519         bcount.b.low    = HWIF(drive)->INB(IDE_BCOUNTL_REG);
520         bcount.b.high   = HWIF(drive)->INB(IDE_BCOUNTH_REG);
521         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
522
523         if (ireason.b.cod) {
524                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
525                 return ide_do_reset (drive);
526         }
527         if (ireason.b.io) {
528                 temp = pc->actually_transferred + bcount.all;
529                 if (temp > pc->request_transfer) {
530                         if (temp > pc->buffer_size) {
531                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
532                                         "send us more data than expected "
533                                         "- discarding data\n");
534                                 temp = pc->buffer_size - pc->actually_transferred;
535                                 if (temp) {
536                                         clear_bit(PC_WRITING, &pc->flags);
537                                         if (pc->sg)
538                                                 idescsi_input_buffers(drive, pc, temp);
539                                         else
540                                                 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
541                                         printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
542                                 }
543                                 pc->actually_transferred += temp;
544                                 pc->current_position += temp;
545                                 idescsi_discard_data(drive, bcount.all - temp);
546                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
547                                 return ide_started;
548                         }
549 #if IDESCSI_DEBUG_LOG
550                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
551 #endif /* IDESCSI_DEBUG_LOG */
552                 }
553         }
554         if (ireason.b.io) {
555                 clear_bit(PC_WRITING, &pc->flags);
556                 if (pc->sg)
557                         idescsi_input_buffers(drive, pc, bcount.all);
558                 else
559                         HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
560         } else {
561                 set_bit(PC_WRITING, &pc->flags);
562                 if (pc->sg)
563                         idescsi_output_buffers (drive, pc, bcount.all);
564                 else
565                         HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
566         }
567         /* Update the current position */
568         pc->actually_transferred += bcount.all;
569         pc->current_position += bcount.all;
570
571         /* And set the interrupt handler again */
572         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
573         return ide_started;
574 }
575
576 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
577 {
578         ide_hwif_t *hwif = drive->hwif;
579         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
580         idescsi_pc_t *pc = scsi->pc;
581         atapi_ireason_t ireason;
582         ide_startstop_t startstop;
583
584         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
585                 printk(KERN_ERR "ide-scsi: Strange, packet command "
586                         "initiated yet DRQ isn't asserted\n");
587                 return startstop;
588         }
589         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
590         if (!ireason.b.cod || ireason.b.io) {
591                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
592                                 "issuing a packet command\n");
593                 return ide_do_reset (drive);
594         }
595         if (HWGROUP(drive)->handler != NULL)
596                 BUG();
597         /* Set the interrupt routine */
598         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
599         /* Send the actual packet */
600         drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
601         if (test_bit (PC_DMA_OK, &pc->flags)) {
602                 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
603                 hwif->dma_start(drive);
604         }
605         return ide_started;
606 }
607
608 static inline int idescsi_set_direction(idescsi_pc_t *pc)
609 {
610         switch (pc->c[0]) {
611                 case READ_6: case READ_10: case READ_12:
612                         clear_bit(PC_WRITING, &pc->flags);
613                         return 0;
614                 case WRITE_6: case WRITE_10: case WRITE_12:
615                         set_bit(PC_WRITING, &pc->flags);
616                         return 0;
617                 default:
618                         return 1;
619         }
620 }
621
622 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
623 {
624         ide_hwif_t *hwif = drive->hwif;
625         struct scatterlist *sg, *scsi_sg;
626         int segments;
627
628         if (!pc->request_transfer || pc->request_transfer % 1024)
629                 return 1;
630
631         if (idescsi_set_direction(pc))
632                 return 1;
633
634         sg = hwif->sg_table;
635         scsi_sg = pc->scsi_cmd->request_buffer;
636         segments = pc->scsi_cmd->use_sg;
637
638         if (segments > hwif->sg_max_nents)
639                 return 1;
640
641         if (!segments) {
642                 hwif->sg_nents = 1;
643                 sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer);
644         } else {
645                 hwif->sg_nents = segments;
646                 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
647         }
648
649         return 0;
650 }
651
652 /*
653  *      Issue a packet command
654  */
655 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
656 {
657         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
658         ide_hwif_t *hwif = drive->hwif;
659         atapi_feature_t feature;
660         atapi_bcount_t bcount;
661
662         scsi->pc=pc;                                                    /* Set the current packet command */
663         pc->actually_transferred=0;                                     /* We haven't transferred any data yet */
664         pc->current_position=pc->buffer;
665         bcount.all = min(pc->request_transfer, 63 * 1024);              /* Request to transfer the entire buffer at once */
666
667         feature.all = 0;
668         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
669                 hwif->sg_mapped = 1;
670                 feature.b.dma = !hwif->dma_setup(drive);
671                 hwif->sg_mapped = 0;
672         }
673
674         SELECT_DRIVE(drive);
675         if (IDE_CONTROL_REG)
676                 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
677
678         HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
679         HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
680         HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
681
682         if (feature.b.dma)
683                 set_bit(PC_DMA_OK, &pc->flags);
684
685         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
686                 if (HWGROUP(drive)->handler != NULL)
687                         BUG();
688                 ide_set_handler(drive, &idescsi_transfer_pc,
689                                 get_timeout(pc), idescsi_expiry);
690                 /* Issue the packet command */
691                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
692                 return ide_started;
693         } else {
694                 /* Issue the packet command */
695                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
696                 return idescsi_transfer_pc(drive);
697         }
698 }
699
700 /*
701  *      idescsi_do_request is our request handling function.
702  */
703 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
704 {
705 #if IDESCSI_DEBUG_LOG
706         printk (KERN_INFO "rq_status: %d, dev: %s, cmd: %x, errors: %d\n",rq->rq_status, rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
707         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
708 #endif /* IDESCSI_DEBUG_LOG */
709
710         if (rq->flags & (REQ_SPECIAL|REQ_SENSE)) {
711                 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
712         }
713         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
714         idescsi_end_request (drive, 0, 0);
715         return ide_stopped;
716 }
717
718 static void idescsi_add_settings(ide_drive_t *drive)
719 {
720         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
721
722 /*
723  *                      drive   setting name    read/write      ioctl   ioctl           data type       min     max     mul_factor      div_factor      data pointer            set function
724  */
725         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
726         ide_add_setting(drive,  "bios_head",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
727         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
728         ide_add_setting(drive,  "transform",    SETTING_RW,     -1,     -1,             TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
729         ide_add_setting(drive,  "log",          SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
730 }
731
732 /*
733  *      Driver initialization.
734  */
735 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
736 {
737         if (drive->id && (drive->id->config & 0x0060) == 0x20)
738                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
739         set_bit(IDESCSI_TRANSFORM, &scsi->transform);
740         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
741 #if IDESCSI_DEBUG_LOG
742         set_bit(IDESCSI_LOG_CMD, &scsi->log);
743 #endif /* IDESCSI_DEBUG_LOG */
744         idescsi_add_settings(drive);
745 }
746
747 static int ide_scsi_remove(struct device *dev)
748 {
749         ide_drive_t *drive = to_ide_device(dev);
750         struct Scsi_Host *scsihost = drive->driver_data;
751         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
752         struct gendisk *g = scsi->disk;
753
754         ide_unregister_subdriver(drive, scsi->driver);
755
756         ide_unregister_region(g);
757
758         drive->driver_data = NULL;
759         g->private_data = NULL;
760         put_disk(g);
761
762         scsi_remove_host(scsihost);
763         ide_scsi_put(scsi);
764
765         return 0;
766 }
767
768 static int ide_scsi_probe(struct device *);
769
770 #ifdef CONFIG_PROC_FS
771 static ide_proc_entry_t idescsi_proc[] = {
772         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
773         { NULL, 0, NULL, NULL }
774 };
775 #else
776 # define idescsi_proc   NULL
777 #endif
778
779 static ide_driver_t idescsi_driver = {
780         .owner                  = THIS_MODULE,
781         .gen_driver = {
782                 .name           = "ide-scsi",
783                 .bus            = &ide_bus_type,
784                 .probe          = ide_scsi_probe,
785                 .remove         = ide_scsi_remove,
786         },
787         .version                = IDESCSI_VERSION,
788         .media                  = ide_scsi,
789         .supports_dsc_overlap   = 0,
790         .proc                   = idescsi_proc,
791         .do_request             = idescsi_do_request,
792         .end_request            = idescsi_end_request,
793         .error                  = idescsi_atapi_error,
794         .abort                  = idescsi_atapi_abort,
795 };
796
797 static int idescsi_ide_open(struct inode *inode, struct file *filp)
798 {
799         struct gendisk *disk = inode->i_bdev->bd_disk;
800         struct ide_scsi_obj *scsi;
801         ide_drive_t *drive;
802
803         if (!(scsi = ide_scsi_get(disk)))
804                 return -ENXIO;
805
806         drive = scsi->drive;
807
808         drive->usage++;
809
810         return 0;
811 }
812
813 static int idescsi_ide_release(struct inode *inode, struct file *filp)
814 {
815         struct gendisk *disk = inode->i_bdev->bd_disk;
816         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
817         ide_drive_t *drive = scsi->drive;
818
819         drive->usage--;
820
821         ide_scsi_put(scsi);
822
823         return 0;
824 }
825
826 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
827                         unsigned int cmd, unsigned long arg)
828 {
829         struct block_device *bdev = inode->i_bdev;
830         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
831         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
832 }
833
834 static struct block_device_operations idescsi_ops = {
835         .owner          = THIS_MODULE,
836         .open           = idescsi_ide_open,
837         .release        = idescsi_ide_release,
838         .ioctl          = idescsi_ide_ioctl,
839 };
840
841 static int idescsi_slave_configure(struct scsi_device * sdp)
842 {
843         /* Configure detected device */
844         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
845         return 0;
846 }
847
848 static const char *idescsi_info (struct Scsi_Host *host)
849 {
850         return "SCSI host adapter emulation for IDE ATAPI devices";
851 }
852
853 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
854 {
855         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
856
857         if (cmd == SG_SET_TRANSFORM) {
858                 if (arg)
859                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
860                 else
861                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
862                 return 0;
863         } else if (cmd == SG_GET_TRANSFORM)
864                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
865         return -EINVAL;
866 }
867
868 static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd)
869 {
870         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
871
872         /* this was a layering violation and we can't support it
873            anymore, sorry. */
874 #if 0
875         struct gendisk *disk = cmd->request->rq_disk;
876
877         if (disk) {
878                 struct Scsi_Device_Template **p = disk->private_data;
879                 if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
880                         return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
881         }
882 #endif
883         return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
884 }
885
886 static int idescsi_queue (struct scsi_cmnd *cmd,
887                 void (*done)(struct scsi_cmnd *))
888 {
889         struct Scsi_Host *host = cmd->device->host;
890         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
891         ide_drive_t *drive = scsi->drive;
892         struct request *rq = NULL;
893         idescsi_pc_t *pc = NULL;
894
895         if (!drive) {
896                 printk (KERN_ERR "ide-scsi: drive id %d not present\n", cmd->device->id);
897                 goto abort;
898         }
899         scsi = drive_to_idescsi(drive);
900         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
901         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
902         if (rq == NULL || pc == NULL) {
903                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
904                 goto abort;
905         }
906
907         memset (pc->c, 0, 12);
908         pc->flags = 0;
909         pc->rq = rq;
910         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
911         if (cmd->use_sg) {
912                 pc->buffer = NULL;
913                 pc->sg = cmd->request_buffer;
914         } else {
915                 pc->buffer = cmd->request_buffer;
916                 pc->sg = NULL;
917         }
918         pc->b_count = 0;
919         pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
920         pc->scsi_cmd = cmd;
921         pc->done = done;
922         pc->timeout = jiffies + cmd->timeout_per_command;
923
924         if (should_transform(drive, cmd))
925                 set_bit(PC_TRANSFORM, &pc->flags);
926         idescsi_transform_pc1 (drive, pc);
927
928         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
929                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
930                 hexdump(cmd->cmnd, cmd->cmd_len);
931                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
932                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
933                         hexdump(pc->c, 12);
934                 }
935         }
936
937         ide_init_drive_cmd (rq);
938         rq->special = (char *) pc;
939         rq->flags = REQ_SPECIAL;
940         spin_unlock_irq(host->host_lock);
941         rq->rq_disk = scsi->disk;
942         (void) ide_do_drive_cmd (drive, rq, ide_end);
943         spin_lock_irq(host->host_lock);
944         return 0;
945 abort:
946         if (pc) kfree (pc);
947         if (rq) kfree (rq);
948         cmd->result = DID_ERROR << 16;
949         done(cmd);
950         return 0;
951 }
952
953 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
954 {
955         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
956         ide_drive_t    *drive = scsi->drive;
957         int             busy;
958         int             ret   = FAILED;
959
960         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
961
962         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
963                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
964
965         if (!drive) {
966                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
967                 WARN_ON(1);
968                 goto no_drive;
969         }
970
971         /* First give it some more time, how much is "right" is hard to say :-( */
972
973         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
974         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
975                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
976
977         spin_lock_irq(&ide_lock);
978
979         /* If there is no pc running we're done (our interrupt took care of it) */
980         if (!scsi->pc) {
981                 ret = SUCCESS;
982                 goto ide_unlock;
983         }
984
985         /* It's somewhere in flight. Does ide subsystem agree? */
986         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
987             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
988                 /*
989                  * FIXME - not sure this condition can ever occur
990                  */
991                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
992
993                 if (scsi->pc->rq->flags & REQ_SENSE)
994                         kfree(scsi->pc->buffer);
995                 kfree(scsi->pc->rq);
996                 kfree(scsi->pc);
997                 scsi->pc = NULL;
998
999                 ret = SUCCESS;
1000         }
1001
1002 ide_unlock:
1003         spin_unlock_irq(&ide_lock);
1004 no_drive:
1005         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1006                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
1007
1008         return ret;
1009 }
1010
1011 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
1012 {
1013         struct request *req;
1014         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
1015         ide_drive_t    *drive = scsi->drive;
1016         int             ready = 0;
1017         int             ret   = SUCCESS;
1018
1019         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
1020
1021         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1022                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
1023
1024         if (!drive) {
1025                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
1026                 WARN_ON(1);
1027                 return FAILED;
1028         }
1029
1030         spin_lock_irq(cmd->device->host->host_lock);
1031         spin_lock(&ide_lock);
1032
1033         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
1034                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
1035                 spin_unlock(&ide_lock);
1036                 spin_unlock_irq(cmd->device->host->host_lock);
1037                 return FAILED;
1038         }
1039
1040         /* kill current request */
1041         blkdev_dequeue_request(req);
1042         end_that_request_last(req);
1043         if (req->flags & REQ_SENSE)
1044                 kfree(scsi->pc->buffer);
1045         kfree(scsi->pc);
1046         scsi->pc = NULL;
1047         kfree(req);
1048
1049         /* now nuke the drive queue */
1050         while ((req = elv_next_request(drive->queue))) {
1051                 blkdev_dequeue_request(req);
1052                 end_that_request_last(req);
1053         }
1054
1055         HWGROUP(drive)->rq = NULL;
1056         HWGROUP(drive)->handler = NULL;
1057         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
1058         spin_unlock(&ide_lock);
1059
1060         ide_do_reset(drive);
1061
1062         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
1063
1064         do {
1065                 spin_unlock_irq(cmd->device->host->host_lock);
1066                 msleep(50);
1067                 spin_lock_irq(cmd->device->host->host_lock);
1068         } while ( HWGROUP(drive)->handler );
1069
1070         ready = drive_is_ready(drive);
1071         HWGROUP(drive)->busy--;
1072         if (!ready) {
1073                 printk (KERN_ERR "ide-scsi: reset failed!\n");
1074                 ret = FAILED;
1075         }
1076
1077         spin_unlock_irq(cmd->device->host->host_lock);
1078         return ret;
1079 }
1080
1081 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
1082                 sector_t capacity, int *parm)
1083 {
1084         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
1085         ide_drive_t *drive = idescsi->drive;
1086
1087         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
1088                 parm[0] = drive->bios_head;
1089                 parm[1] = drive->bios_sect;
1090                 parm[2] = drive->bios_cyl;
1091         }
1092         return 0;
1093 }
1094
1095 static struct scsi_host_template idescsi_template = {
1096         .module                 = THIS_MODULE,
1097         .name                   = "idescsi",
1098         .info                   = idescsi_info,
1099         .slave_configure        = idescsi_slave_configure,
1100         .ioctl                  = idescsi_ioctl,
1101         .queuecommand           = idescsi_queue,
1102         .eh_abort_handler       = idescsi_eh_abort,
1103         .eh_host_reset_handler  = idescsi_eh_reset,
1104         .bios_param             = idescsi_bios,
1105         .can_queue              = 40,
1106         .this_id                = -1,
1107         .sg_tablesize           = 256,
1108         .cmd_per_lun            = 5,
1109         .max_sectors            = 128,
1110         .use_clustering         = DISABLE_CLUSTERING,
1111         .emulated               = 1,
1112         .proc_name              = "ide-scsi",
1113 };
1114
1115 static int ide_scsi_probe(struct device *dev)
1116 {
1117         ide_drive_t *drive = to_ide_device(dev);
1118         idescsi_scsi_t *idescsi;
1119         struct Scsi_Host *host;
1120         struct gendisk *g;
1121         static int warned;
1122         int err = -ENOMEM;
1123
1124         if (!warned && drive->media == ide_cdrom) {
1125                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1126                 warned = 1;
1127         }
1128
1129         if (!strstr("ide-scsi", drive->driver_req) ||
1130             !drive->present ||
1131             drive->media == ide_disk ||
1132             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1133                 return -ENODEV;
1134
1135         g = alloc_disk(1 << PARTN_BITS);
1136         if (!g)
1137                 goto out_host_put;
1138
1139         ide_init_disk(g, drive);
1140
1141         host->max_id = 1;
1142
1143 #if IDESCSI_DEBUG_LOG
1144         if (drive->id->last_lun)
1145                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1146 #endif
1147         if ((drive->id->last_lun & 0x7) != 7)
1148                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1149         else
1150                 host->max_lun = 1;
1151
1152         drive->driver_data = host;
1153         idescsi = scsihost_to_idescsi(host);
1154         idescsi->drive = drive;
1155         idescsi->driver = &idescsi_driver;
1156         idescsi->host = host;
1157         idescsi->disk = g;
1158         g->private_data = &idescsi->driver;
1159         ide_register_subdriver(drive, &idescsi_driver);
1160         err = 0;
1161         idescsi_setup(drive, idescsi);
1162         g->fops = &idescsi_ops;
1163         ide_register_region(g);
1164         err = scsi_add_host(host, &drive->gendev);
1165         if (!err) {
1166                 scsi_scan_host(host);
1167                 return 0;
1168         }
1169         /* fall through on error */
1170         ide_unregister_region(g);
1171         ide_unregister_subdriver(drive, &idescsi_driver);
1172
1173         put_disk(g);
1174 out_host_put:
1175         scsi_host_put(host);
1176         return err;
1177 }
1178
1179 static int __init init_idescsi_module(void)
1180 {
1181         return driver_register(&idescsi_driver.gen_driver);
1182 }
1183
1184 static void __exit exit_idescsi_module(void)
1185 {
1186         driver_unregister(&idescsi_driver.gen_driver);
1187 }
1188
1189 module_init(init_idescsi_module);
1190 module_exit(exit_idescsi_module);
1191 MODULE_LICENSE("GPL");