git.oblomov.eu Git - linux-2.6/blob - drivers/scsi/scsi_devinfo.c

   1
   2 #include <linux/blkdev.h>
   3 #include <linux/init.h>
   4 #include <linux/kernel.h>
   5 #include <linux/module.h>
   6 #include <linux/moduleparam.h>
   7 #include <linux/proc_fs.h>
   8 #include <linux/seq_file.h>
   9
  10 #include <scsi/scsi_device.h>
  11 #include <scsi/scsi_devinfo.h>
  12
  13 #include "scsi_priv.h"
  14
  15
  16 /*
  17  * scsi_dev_info_list: structure to hold black/white listed devices.
  18  */
  19 struct scsi_dev_info_list {
  20         struct list_head dev_info_list;
  21         char vendor[8];
  22         char model[16];
  23         unsigned flags;
  24         unsigned compatible; /* for use with scsi_static_device_list entries */
  25 };
  26
  27
  28 static const char spaces[] = "                "; /* 16 of them */
  29 static unsigned scsi_default_dev_flags;
  30 static LIST_HEAD(scsi_dev_info_list);
  31 static char scsi_dev_flags[256];
  32
  33 /*
  34  * scsi_static_device_list: deprecated list of devices that require
  35  * settings that differ from the default, includes black-listed (broken)
  36  * devices. The entries here are added to the tail of scsi_dev_info_list
  37  * via scsi_dev_info_list_init.
  38  *
  39  * Do not add to this list, use the command line or proc interface to add
  40  * to the scsi_dev_info_list. This table will eventually go away.
  41  */
  42 static struct {
  43         char *vendor;
  44         char *model;
  45         char *revision; /* revision known to be bad, unused */
  46         unsigned flags;
  47 } scsi_static_device_list[] __initdata = {
  48         /*
  49          * The following devices are known not to tolerate a lun != 0 scan
  50          * for one reason or another. Some will respond to all luns,
  51          * others will lock up.
  52          */
  53         {"Aashima", "IMAGERY 2400SP", "1.03", BLIST_NOLUN},     /* locks up */
  54         {"CHINON", "CD-ROM CDS-431", "H42", BLIST_NOLUN},       /* locks up */
  55         {"CHINON", "CD-ROM CDS-535", "Q14", BLIST_NOLUN},       /* locks up */
  56         {"DENON", "DRD-25X", "V", BLIST_NOLUN},                 /* locks up */
  57         {"HITACHI", "DK312C", "CM81", BLIST_NOLUN},     /* responds to all lun */
  58         {"HITACHI", "DK314C", "CR21", BLIST_NOLUN},     /* responds to all lun */
  59         {"IBM", "2104-DU3", NULL, BLIST_NOLUN},         /* locks up */
  60         {"IBM", "2104-TU3", NULL, BLIST_NOLUN},         /* locks up */
  61         {"IMS", "CDD521/10", "2.06", BLIST_NOLUN},      /* locks up */
  62         {"MAXTOR", "XT-3280", "PR02", BLIST_NOLUN},     /* locks up */
  63         {"MAXTOR", "XT-4380S", "B3C", BLIST_NOLUN},     /* locks up */
  64         {"MAXTOR", "MXT-1240S", "I1.2", BLIST_NOLUN},   /* locks up */
  65         {"MAXTOR", "XT-4170S", "B5A", BLIST_NOLUN},     /* locks up */
  66         {"MAXTOR", "XT-8760S", "B7B", BLIST_NOLUN},     /* locks up */
  67         {"MEDIAVIS", "RENO CD-ROMX2A", "2.03", BLIST_NOLUN},    /* responds to all lun */
  68         {"MICROTEK", "ScanMakerIII", "2.30", BLIST_NOLUN},      /* responds to all lun */
  69         {"NEC", "CD-ROM DRIVE:841", "1.0", BLIST_NOLUN},/* locks up */
  70         {"PHILIPS", "PCA80SC", "V4-2", BLIST_NOLUN},    /* responds to all lun */
  71         {"RODIME", "RO3000S", "2.33", BLIST_NOLUN},     /* locks up */
  72         {"SUN", "SENA", NULL, BLIST_NOLUN},             /* responds to all luns */
  73         /*
  74          * The following causes a failed REQUEST SENSE on lun 1 for
  75          * aha152x controller, which causes SCSI code to reset bus.
  76          */
  77         {"SANYO", "CRD-250S", "1.20", BLIST_NOLUN},
  78         /*
  79          * The following causes a failed REQUEST SENSE on lun 1 for
  80          * aha152x controller, which causes SCSI code to reset bus.
  81          */
  82         {"SEAGATE", "ST157N", "\004|j", BLIST_NOLUN},
  83         {"SEAGATE", "ST296", "921", BLIST_NOLUN},       /* responds to all lun */
  84         {"SEAGATE", "ST1581", "6538", BLIST_NOLUN},     /* responds to all lun */
  85         {"SONY", "CD-ROM CDU-541", "4.3d", BLIST_NOLUN},
  86         {"SONY", "CD-ROM CDU-55S", "1.0i", BLIST_NOLUN},
  87         {"SONY", "CD-ROM CDU-561", "1.7x", BLIST_NOLUN},
  88         {"SONY", "CD-ROM CDU-8012", NULL, BLIST_NOLUN},
  89         {"SONY", "SDT-5000", "3.17", BLIST_SELECT_NO_ATN},
  90         {"TANDBERG", "TDC 3600", "U07", BLIST_NOLUN},   /* locks up */
  91         {"TEAC", "CD-R55S", "1.0H", BLIST_NOLUN},       /* locks up */
  92         /*
  93          * The following causes a failed REQUEST SENSE on lun 1 for
  94          * seagate controller, which causes SCSI code to reset bus.
  95          */
  96         {"TEAC", "CD-ROM", "1.06", BLIST_NOLUN},
  97         {"TEAC", "MT-2ST/45S2-27", "RV M", BLIST_NOLUN},        /* responds to all lun */
  98         /*
  99          * The following causes a failed REQUEST SENSE on lun 1 for
 100          * seagate controller, which causes SCSI code to reset bus.
 101          */
 102         {"HP", "C1750A", "3226", BLIST_NOLUN},          /* scanjet iic */
 103         {"HP", "C1790A", "", BLIST_NOLUN},              /* scanjet iip */
 104         {"HP", "C2500A", "", BLIST_NOLUN},              /* scanjet iicx */
 105         {"MEDIAVIS", "CDR-H93MV", "1.31", BLIST_NOLUN}, /* locks up */
 106         {"MICROTEK", "ScanMaker II", "5.61", BLIST_NOLUN},      /* responds to all lun */
 107         {"MITSUMI", "CD-R CR-2201CS", "6119", BLIST_NOLUN},     /* locks up */
 108         {"NEC", "D3856", "0009", BLIST_NOLUN},
 109         {"QUANTUM", "LPS525S", "3110", BLIST_NOLUN},    /* locks up */
 110         {"QUANTUM", "PD1225S", "3110", BLIST_NOLUN},    /* locks up */
 111         {"QUANTUM", "FIREBALL ST4.3S", "0F0C", BLIST_NOLUN},    /* locks up */
 112         {"RELISYS", "Scorpio", NULL, BLIST_NOLUN},      /* responds to all lun */
 113         {"SANKYO", "CP525", "6.64", BLIST_NOLUN},       /* causes failed REQ SENSE, extra reset */
 114         {"TEXEL", "CD-ROM", "1.06", BLIST_NOLUN},
 115         {"transtec", "T5008", "0001", BLIST_NOREPORTLUN },
 116         {"YAMAHA", "CDR100", "1.00", BLIST_NOLUN},      /* locks up */
 117         {"YAMAHA", "CDR102", "1.00", BLIST_NOLUN},      /* locks up */
 118         {"YAMAHA", "CRW8424S", "1.0", BLIST_NOLUN},     /* locks up */
 119         {"YAMAHA", "CRW6416S", "1.0c", BLIST_NOLUN},    /* locks up */
 120         {"", "Scanner", "1.80", BLIST_NOLUN},   /* responds to all lun */
 121
 122         /*
 123          * Other types of devices that have special flags.
 124          * Note that all USB devices should have the BLIST_INQUIRY_36 flag.
 125          */
 126         {"3PARdata", "VV", NULL, BLIST_REPORTLUN2},
 127         {"ADAPTEC", "AACRAID", NULL, BLIST_FORCELUN},
 128         {"ADAPTEC", "Adaptec 5400S", NULL, BLIST_FORCELUN},
 129         {"AFT PRO", "-IX CF", "0.0>", BLIST_FORCELUN},
 130         {"BELKIN", "USB 2 HS-CF", "1.95",  BLIST_FORCELUN | BLIST_INQUIRY_36},
 131         {"BROWNIE", "1600U3P", NULL, BLIST_NOREPORTLUN},
 132         {"CANON", "IPUBJD", NULL, BLIST_SPARSELUN},
 133         {"CBOX3", "USB Storage-SMC", "300A", BLIST_FORCELUN | BLIST_INQUIRY_36},
 134         {"CMD", "CRA-7280", NULL, BLIST_SPARSELUN},     /* CMD RAID Controller */
 135         {"CNSI", "G7324", NULL, BLIST_SPARSELUN},       /* Chaparral G7324 RAID */
 136         {"CNSi", "G8324", NULL, BLIST_SPARSELUN},       /* Chaparral G8324 RAID */
 137         {"COMPAQ", "ARRAY CONTROLLER", NULL, BLIST_SPARSELUN | BLIST_LARGELUN |
 138                 BLIST_MAX_512 | BLIST_REPORTLUN2},      /* Compaq RA4x00 */
 139         {"COMPAQ", "LOGICAL VOLUME", NULL, BLIST_FORCELUN | BLIST_MAX_512}, /* Compaq RA4x00 */
 140         {"COMPAQ", "CR3500", NULL, BLIST_FORCELUN},
 141         {"COMPAQ", "MSA1000", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
 142         {"COMPAQ", "MSA1000 VOLUME", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
 143         {"COMPAQ", "HSV110", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
 144         {"DDN", "SAN DataDirector", "*", BLIST_SPARSELUN},
 145         {"DEC", "HSG80", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
 146         {"DELL", "PV660F", NULL, BLIST_SPARSELUN},
 147         {"DELL", "PV660F   PSEUDO", NULL, BLIST_SPARSELUN},
 148         {"DELL", "PSEUDO DEVICE .", NULL, BLIST_SPARSELUN},     /* Dell PV 530F */
 149         {"DELL", "PV530F", NULL, BLIST_SPARSELUN},
 150         {"DELL", "PERCRAID", NULL, BLIST_FORCELUN},
 151         {"DGC", "RAID", NULL, BLIST_SPARSELUN}, /* Dell PV 650F, storage on LUN 0 */
 152         {"DGC", "DISK", NULL, BLIST_SPARSELUN}, /* Dell PV 650F, no storage on LUN 0 */
 153         {"EMC", "SYMMETRIX", NULL, BLIST_SPARSELUN | BLIST_LARGELUN | BLIST_FORCELUN},
 154         {"EMULEX", "MD21/S2     ESDI", NULL, BLIST_SINGLELUN},
 155         {"FSC", "CentricStor", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
 156         {"Generic", "USB SD Reader", "1.00", BLIST_FORCELUN | BLIST_INQUIRY_36},
 157         {"Generic", "USB Storage-SMC", "0180", BLIST_FORCELUN | BLIST_INQUIRY_36},
 158         {"Generic", "USB Storage-SMC", "0207", BLIST_FORCELUN | BLIST_INQUIRY_36},
 159         {"HITACHI", "DF400", "*", BLIST_SPARSELUN},
 160         {"HITACHI", "DF500", "*", BLIST_SPARSELUN},
 161         {"HITACHI", "DF600", "*", BLIST_SPARSELUN},
 162         {"HITACHI", "DISK-SUBSYSTEM", "*", BLIST_ATTACH_PQ3 | BLIST_SPARSELUN | BLIST_LARGELUN},
 163         {"HITACHI", "OPEN-E", "*", BLIST_ATTACH_PQ3 | BLIST_SPARSELUN | BLIST_LARGELUN},
 164         {"HP", "A6189A", NULL, BLIST_SPARSELUN | BLIST_LARGELUN},       /* HP VA7400 */
 165         {"HP", "OPEN-", "*", BLIST_SPARSELUN | BLIST_LARGELUN}, /* HP XP Arrays */
 166         {"HP", "NetRAID-4M", NULL, BLIST_FORCELUN},
 167         {"HP", "HSV100", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
 168         {"HP", "C1557A", NULL, BLIST_FORCELUN},
 169         {"HP", "C3323-300", "4269", BLIST_NOTQ},
 170         {"HP", "C5713A", NULL, BLIST_NOREPORTLUN},
 171         {"IBM", "AuSaV1S2", NULL, BLIST_FORCELUN},
 172         {"IBM", "ProFibre 4000R", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
 173         {"IBM", "2105", NULL, BLIST_RETRY_HWERROR},
 174         {"iomega", "jaz 1GB", "J.86", BLIST_NOTQ | BLIST_NOLUN},
 175         {"IOMEGA", "Io20S         *F", NULL, BLIST_KEY},
 176         {"INSITE", "Floptical   F*8I", NULL, BLIST_KEY},
 177         {"INSITE", "I325VM", NULL, BLIST_KEY},
 178         {"iRiver", "iFP Mass Driver", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
 179         {"LASOUND", "CDX7405", "3.10", BLIST_MAX5LUN | BLIST_SINGLELUN},
 180         {"MATSHITA", "PD-1", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 181         {"MATSHITA", "DMC-LC5", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
 182         {"MATSHITA", "DMC-LC40", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
 183         {"Medion", "Flash XL  MMC/SD", "2.6D", BLIST_FORCELUN},
 184         {"MegaRAID", "LD", NULL, BLIST_FORCELUN},
 185         {"MICROP", "4110", NULL, BLIST_NOTQ},
 186         {"MYLEX", "DACARMRB", "*", BLIST_REPORTLUN2},
 187         {"nCipher", "Fastness Crypto", NULL, BLIST_FORCELUN},
 188         {"NAKAMICH", "MJ-4.8S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 189         {"NAKAMICH", "MJ-5.16S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 190         {"NEC", "PD-1 ODX654P", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 191         {"NRC", "MBR-7", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 192         {"NRC", "MBR-7.4", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 193         {"PIONEER", "CD-ROM DRM-600", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 194         {"PIONEER", "CD-ROM DRM-602X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 195         {"PIONEER", "CD-ROM DRM-604X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 196         {"PIONEER", "CD-ROM DRM-624X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 197         {"REGAL", "CDC-4X", NULL, BLIST_MAX5LUN | BLIST_SINGLELUN},
 198         {"SanDisk", "ImageMate CF-SD1", NULL, BLIST_FORCELUN},
 199         {"SEAGATE", "ST34555N", "0930", BLIST_NOTQ},    /* Chokes on tagged INQUIRY */
 200         {"SEAGATE", "ST3390N", "9546", BLIST_NOTQ},
 201         {"SGI", "RAID3", "*", BLIST_SPARSELUN},
 202         {"SGI", "RAID5", "*", BLIST_SPARSELUN},
 203         {"SGI", "TP9100", "*", BLIST_REPORTLUN2},
 204         {"SGI", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
 205         {"IBM", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
 206         {"SMSC", "USB 2 HS-CF", NULL, BLIST_SPARSELUN | BLIST_INQUIRY_36},
 207         {"SONY", "CD-ROM CDU-8001", NULL, BLIST_BORKEN},
 208         {"SONY", "TSL", NULL, BLIST_FORCELUN},          /* DDS3 & DDS4 autoloaders */
 209         {"ST650211", "CF", NULL, BLIST_RETRY_HWERROR},
 210         {"SUN", "T300", "*", BLIST_SPARSELUN},
 211         {"SUN", "T4", "*", BLIST_SPARSELUN},
 212         {"TEXEL", "CD-ROM", "1.06", BLIST_BORKEN},
 213         {"TOSHIBA", "CDROM", NULL, BLIST_ISROM},
 214         {"TOSHIBA", "CD-ROM", NULL, BLIST_ISROM},
 215         {"USB2.0", "SMARTMEDIA/XD", NULL, BLIST_FORCELUN | BLIST_INQUIRY_36},
 216         {"WangDAT", "Model 2600", "01.7", BLIST_SELECT_NO_ATN},
 217         {"WangDAT", "Model 3200", "02.2", BLIST_SELECT_NO_ATN},
 218         {"WangDAT", "Model 1300", "02.4", BLIST_SELECT_NO_ATN},
 219         {"WDC WD25", "00JB-00FUA0", NULL, BLIST_NOREPORTLUN},
 220         {"XYRATEX", "RS", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
 221         {"Zzyzx", "RocketStor 500S", NULL, BLIST_SPARSELUN},
 222         {"Zzyzx", "RocketStor 2000", NULL, BLIST_SPARSELUN},
 223         { NULL, NULL, NULL, 0 },
 224 };
 225
 226 /*
 227  * scsi_strcpy_devinfo: called from scsi_dev_info_list_add to copy into
 228  * devinfo vendor and model strings.
 229  */
 230 static void scsi_strcpy_devinfo(char *name, char *to, size_t to_length,
 231                                 char *from, int compatible)
 232 {
 233         size_t from_length;
 234
 235         from_length = strlen(from);
 236         strncpy(to, from, min(to_length, from_length));
 237         if (from_length < to_length) {
 238                 if (compatible) {
 239                         /*
 240                          * NUL terminate the string if it is short.
 241                          */
 242                         to[from_length] = '\0';
 243                 } else {
 244                         /*
 245                          * space pad the string if it is short.
 246                          */
 247                         strncpy(&to[from_length], spaces,
 248                                 to_length - from_length);
 249                 }
 250         }
 251         if (from_length > to_length)
 252                  printk(KERN_WARNING "%s: %s string '%s' is too long\n",
 253                         __FUNCTION__, name, from);
 254 }
 255
 256 /**
 257  * scsi_dev_info_list_add: add one dev_info list entry.
 258  * @vendor:     vendor string
 259  * @model:      model (product) string
 260  * @strflags:   integer string
 261  * @flag:       if strflags NULL, use this flag value
 262  *
 263  * Description:
 264  *      Create and add one dev_info entry for @vendor, @model, @strflags or
 265  *      @flag. If @compatible, add to the tail of the list, do not space
 266  *      pad, and set devinfo->compatible. The scsi_static_device_list entries
 267  *      are added with @compatible 1 and @clfags NULL.
 268  *
 269  * Returns: 0 OK, -error on failure.
 270  **/
 271 static int scsi_dev_info_list_add(int compatible, char *vendor, char *model,
 272                             char *strflags, int flags)
 273 {
 274         struct scsi_dev_info_list *devinfo;
 275
 276         devinfo = kmalloc(sizeof(*devinfo), GFP_KERNEL);
 277         if (!devinfo) {
 278                 printk(KERN_ERR "%s: no memory\n", __FUNCTION__);
 279                 return -ENOMEM;
 280         }
 281
 282         scsi_strcpy_devinfo("vendor", devinfo->vendor, sizeof(devinfo->vendor),
 283                             vendor, compatible);
 284         scsi_strcpy_devinfo("model", devinfo->model, sizeof(devinfo->model),
 285                             model, compatible);
 286
 287         if (strflags)
 288                 devinfo->flags = simple_strtoul(strflags, NULL, 0);
 289         else
 290                 devinfo->flags = flags;
 291
 292         devinfo->compatible = compatible;
 293
 294         if (compatible)
 295                 list_add_tail(&devinfo->dev_info_list, &scsi_dev_info_list);
 296         else
 297                 list_add(&devinfo->dev_info_list, &scsi_dev_info_list);
 298
 299         return 0;
 300 }
 301
 302 /**
 303  * scsi_dev_info_list_add_str: parse dev_list and add to the
 304  * scsi_dev_info_list.
 305  * @dev_list:   string of device flags to add
 306  *
 307  * Description:
 308  *      Parse dev_list, and add entries to the scsi_dev_info_list.
 309  *      dev_list is of the form "vendor:product:flag,vendor:product:flag".
 310  *      dev_list is modified via strsep. Can be called for command line
 311  *      addition, for proc or mabye a sysfs interface.
 312  *
 313  * Returns: 0 if OK, -error on failure.
 314  **/
 315 static int scsi_dev_info_list_add_str(char *dev_list)
 316 {
 317         char *vendor, *model, *strflags, *next;
 318         char *next_check;
 319         int res = 0;
 320
 321         next = dev_list;
 322         if (next && next[0] == '"') {
 323                 /*
 324                  * Ignore both the leading and trailing quote.
 325                  */
 326                 next++;
 327                 next_check = ",\"";
 328         } else {
 329                 next_check = ",";
 330         }
 331
 332         /*
 333          * For the leading and trailing '"' case, the for loop comes
 334          * through the last time with vendor[0] == '\0'.
 335          */
 336         for (vendor = strsep(&next, ":"); vendor && (vendor[0] != '\0')
 337              && (res == 0); vendor = strsep(&next, ":")) {
 338                 strflags = NULL;
 339                 model = strsep(&next, ":");
 340                 if (model)
 341                         strflags = strsep(&next, next_check);
 342                 if (!model || !strflags) {
 343                         printk(KERN_ERR "%s: bad dev info string '%s' '%s'"
 344                                " '%s'\n", __FUNCTION__, vendor, model,
 345                                strflags);
 346                         res = -EINVAL;
 347                 } else
 348                         res = scsi_dev_info_list_add(0 /* compatible */, vendor,
 349                                                      model, strflags, 0);
 350         }
 351         return res;
 352 }
 353
 354 /**
 355  * get_device_flags - get device specific flags from the dynamic device
 356  * list. Called during scan time.
 357  * @vendor:     vendor name
 358  * @model:      model name
 359  *
 360  * Description:
 361  *     Search the scsi_dev_info_list for an entry matching @vendor and
 362  *     @model, if found, return the matching flags value, else return
 363  *     the host or global default settings.
 364  **/
 365 int scsi_get_device_flags(struct scsi_device *sdev,
 366                           const unsigned char *vendor,
 367                           const unsigned char *model)
 368 {
 369         struct scsi_dev_info_list *devinfo;
 370         unsigned int bflags;
 371
 372         bflags = sdev->sdev_bflags;
 373         if (!bflags)
 374                 bflags = scsi_default_dev_flags;
 375
 376         list_for_each_entry(devinfo, &scsi_dev_info_list, dev_info_list) {
 377                 if (devinfo->compatible) {
 378                         /*
 379                          * Behave like the older version of get_device_flags.
 380                          */
 381                         size_t max;
 382                         /*
 383                          * XXX why skip leading spaces? If an odd INQUIRY
 384                          * value, that should have been part of the
 385                          * scsi_static_device_list[] entry, such as "  FOO"
 386                          * rather than "FOO". Since this code is already
 387                          * here, and we don't know what device it is
 388                          * trying to work with, leave it as-is.
 389                          */
 390                         max = 8;        /* max length of vendor */
 391                         while ((max > 0) && *vendor == ' ') {
 392                                 max--;
 393                                 vendor++;
 394                         }
 395                         /*
 396                          * XXX removing the following strlen() would be
 397                          * good, using it means that for a an entry not in
 398                          * the list, we scan every byte of every vendor
 399                          * listed in scsi_static_device_list[], and never match
 400                          * a single one (and still have to compare at
 401                          * least the first byte of each vendor).
 402                          */
 403                         if (memcmp(devinfo->vendor, vendor,
 404                                     min(max, strlen(devinfo->vendor))))
 405                                 continue;
 406                         /*
 407                          * Skip spaces again.
 408                          */
 409                         max = 16;       /* max length of model */
 410                         while ((max > 0) && *model == ' ') {
 411                                 max--;
 412                                 model++;
 413                         }
 414                         if (memcmp(devinfo->model, model,
 415                                    min(max, strlen(devinfo->model))))
 416                                 continue;
 417                         return devinfo->flags;
 418                 } else {
 419                         if (!memcmp(devinfo->vendor, vendor,
 420                                      sizeof(devinfo->vendor)) &&
 421                              !memcmp(devinfo->model, model,
 422                                       sizeof(devinfo->model)))
 423                                 return devinfo->flags;
 424                 }
 425         }
 426         return bflags;
 427 }
 428
 429 #ifdef CONFIG_SCSI_PROC_FS
 430 /*
 431  * proc_scsi_dev_info_read: dump the scsi_dev_info_list via
 432  * /proc/scsi/device_info
 433  */
 434 static int proc_scsi_devinfo_read(char *buffer, char **start,
 435                                   off_t offset, int length)
 436 {
 437         struct scsi_dev_info_list *devinfo;
 438         int size, len = 0;
 439         off_t begin = 0;
 440         off_t pos = 0;
 441
 442         list_for_each_entry(devinfo, &scsi_dev_info_list, dev_info_list) {
 443                 size = sprintf(buffer + len, "'%.8s' '%.16s' 0x%x\n",
 444                         devinfo->vendor, devinfo->model, devinfo->flags);
 445                 len += size;
 446                 pos = begin + len;
 447                 if (pos < offset) {
 448                         len = 0;
 449                         begin = pos;
 450                 }
 451                 if (pos > offset + length)
 452                         goto stop_output;
 453         }
 454
 455 stop_output:
 456         *start = buffer + (offset - begin);     /* Start of wanted data */
 457         len -= (offset - begin);        /* Start slop */
 458         if (len > length)
 459                 len = length;   /* Ending slop */
 460         return (len);
 461 }
 462
 463 /*
 464  * proc_scsi_dev_info_write: allow additions to the scsi_dev_info_list via
 465  * /proc.
 466  *
 467  * Use: echo "vendor:model:flag" > /proc/scsi/device_info
 468  *
 469  * To add a black/white list entry for vendor and model with an integer
 470  * value of flag to the scsi device info list.
 471  */
 472 static int proc_scsi_devinfo_write(struct file *file, const char __user *buf,
 473                                    unsigned long length, void *data)
 474 {
 475         char *buffer;
 476         int err = length;
 477
 478         if (!buf || length>PAGE_SIZE)
 479                 return -EINVAL;
 480         if (!(buffer = (char *) __get_free_page(GFP_KERNEL)))
 481                 return -ENOMEM;
 482         if (copy_from_user(buffer, buf, length)) {
 483                 err =-EFAULT;
 484                 goto out;
 485         }
 486
 487         if (length < PAGE_SIZE)
 488                 buffer[length] = '\0';
 489         else if (buffer[PAGE_SIZE-1]) {
 490                 err = -EINVAL;
 491                 goto out;
 492         }
 493
 494         scsi_dev_info_list_add_str(buffer);
 495
 496 out:
 497         free_page((unsigned long)buffer);
 498         return err;
 499 }
 500 #endif /* CONFIG_SCSI_PROC_FS */
 501
 502 module_param_string(dev_flags, scsi_dev_flags, sizeof(scsi_dev_flags), 0);
 503 MODULE_PARM_DESC(dev_flags,
 504          "Given scsi_dev_flags=vendor:model:flags[,v:m:f] add black/white"
 505          " list entries for vendor and model with an integer value of flags"
 506          " to the scsi device info list");
 507
 508 module_param_named(default_dev_flags, scsi_default_dev_flags, int, S_IRUGO|S_IWUSR);
 509 MODULE_PARM_DESC(default_dev_flags,
 510                  "scsi default device flag integer value");
 511
 512 /**
 513  * scsi_dev_info_list_delete: called from scsi.c:exit_scsi to remove
 514  *      the scsi_dev_info_list.
 515  **/
 516 void scsi_exit_devinfo(void)
 517 {
 518         struct list_head *lh, *lh_next;
 519         struct scsi_dev_info_list *devinfo;
 520
 521 #ifdef CONFIG_SCSI_PROC_FS
 522         remove_proc_entry("scsi/device_info", NULL);
 523 #endif
 524
 525         list_for_each_safe(lh, lh_next, &scsi_dev_info_list) {
 526                 devinfo = list_entry(lh, struct scsi_dev_info_list,
 527                                      dev_info_list);
 528                 kfree(devinfo);
 529         }
 530 }
 531
 532 /**
 533  * scsi_dev_list_init: set up the dynamic device list.
 534  * @dev_list:   string of device flags to add
 535  *
 536  * Description:
 537  *      Add command line @dev_list entries, then add
 538  *      scsi_static_device_list entries to the scsi device info list.
 539  **/
 540 int __init scsi_init_devinfo(void)
 541 {
 542 #ifdef CONFIG_SCSI_PROC_FS
 543         struct proc_dir_entry *p;
 544 #endif
 545         int error, i;
 546
 547         error = scsi_dev_info_list_add_str(scsi_dev_flags);
 548         if (error)
 549                 return error;
 550
 551         for (i = 0; scsi_static_device_list[i].vendor; i++) {
 552                 error = scsi_dev_info_list_add(1 /* compatibile */,
 553                                 scsi_static_device_list[i].vendor,
 554                                 scsi_static_device_list[i].model,
 555                                 NULL,
 556                                 scsi_static_device_list[i].flags);
 557                 if (error)
 558                         goto out;
 559         }
 560
 561 #ifdef CONFIG_SCSI_PROC_FS
 562         p = create_proc_entry("scsi/device_info", 0, NULL);
 563         if (!p) {
 564                 error = -ENOMEM;
 565                 goto out;
 566         }
 567
 568         p->owner = THIS_MODULE;
 569         p->get_info = proc_scsi_devinfo_read;
 570         p->write_proc = proc_scsi_devinfo_write;
 571 #endif /* CONFIG_SCSI_PROC_FS */
 572
 573  out:
 574         if (error)
 575                 scsi_exit_devinfo();
 576         return error;
 577 }