[PATCH] Remove redundant NULL checks before [kv]free - in drivers/
[linux-2.6] / drivers / char / agp / alpha-agp.c
1 #include <linux/module.h>
2 #include <linux/pci.h>
3 #include <linux/init.h>
4 #include <linux/agp_backend.h>
5 #include <linux/mm.h>
6 #include <linux/slab.h>
7
8 #include <asm/machvec.h>
9 #include <asm/agp_backend.h>
10 #include "../../../arch/alpha/kernel/pci_impl.h"
11
12 #include "agp.h"
13
14 static struct page *alpha_core_agp_vm_nopage(struct vm_area_struct *vma,
15                                              unsigned long address,
16                                              int *type)
17 {
18         alpha_agp_info *agp = agp_bridge->dev_private_data;
19         dma_addr_t dma_addr;
20         unsigned long pa;
21         struct page *page;
22
23         dma_addr = address - vma->vm_start + agp->aperture.bus_base;
24         pa = agp->ops->translate(agp, dma_addr);
25
26         if (pa == (unsigned long)-EINVAL)
27                 return NULL;    /* no translation */
28
29         /*
30          * Get the page, inc the use count, and return it
31          */
32         page = virt_to_page(__va(pa));
33         get_page(page);
34         if (type)
35                 *type = VM_FAULT_MINOR;
36         return page;
37 }
38
39 static struct aper_size_info_fixed alpha_core_agp_sizes[] =
40 {
41         { 0, 0, 0 }, /* filled in by alpha_core_agp_setup */
42 };
43
44 struct vm_operations_struct alpha_core_agp_vm_ops = {
45         .nopage = alpha_core_agp_vm_nopage,
46 };
47
48
49 static int alpha_core_agp_fetch_size(void)
50 {
51         return alpha_core_agp_sizes[0].size;
52 }
53
54 static int alpha_core_agp_configure(void)
55 {
56         alpha_agp_info *agp = agp_bridge->dev_private_data;
57         agp_bridge->gart_bus_addr = agp->aperture.bus_base;
58         return 0;
59 }
60
61 static void alpha_core_agp_cleanup(void)
62 {
63         alpha_agp_info *agp = agp_bridge->dev_private_data;
64
65         agp->ops->cleanup(agp);
66 }
67
68 static void alpha_core_agp_tlbflush(struct agp_memory *mem)
69 {
70         alpha_agp_info *agp = agp_bridge->dev_private_data;
71         alpha_mv.mv_pci_tbi(agp->hose, 0, -1);
72 }
73
74 static void alpha_core_agp_enable(struct agp_bridge_data *bridge, u32 mode)
75 {
76         alpha_agp_info *agp = bridge->dev_private_data;
77
78         agp->mode.lw = agp_collect_device_status(bridge, mode,
79                                         agp->capability.lw);
80
81         agp->mode.bits.enable = 1;
82         agp->ops->configure(agp);
83
84         agp_device_command(agp->mode.lw, 0);
85 }
86
87 static int alpha_core_agp_insert_memory(struct agp_memory *mem, off_t pg_start,
88                                         int type)
89 {
90         alpha_agp_info *agp = agp_bridge->dev_private_data;
91         int num_entries, status;
92         void *temp;
93
94         temp = agp_bridge->current_size;
95         num_entries = A_SIZE_FIX(temp)->num_entries;
96         if ((pg_start + mem->page_count) > num_entries)
97                 return -EINVAL;
98
99         status = agp->ops->bind(agp, pg_start, mem);
100         mb();
101         alpha_core_agp_tlbflush(mem);
102
103         return status;
104 }
105
106 static int alpha_core_agp_remove_memory(struct agp_memory *mem, off_t pg_start,
107                                         int type)
108 {
109         alpha_agp_info *agp = agp_bridge->dev_private_data;
110         int status;
111
112         status = agp->ops->unbind(agp, pg_start, mem);
113         alpha_core_agp_tlbflush(mem);
114         return status;
115 }
116
117 static int alpha_core_agp_create_free_gatt_table(struct agp_bridge_data *a)
118 {
119         return 0;
120 }
121
122 struct agp_bridge_driver alpha_core_agp_driver = {
123         .owner                  = THIS_MODULE,
124         .aperture_sizes         = alpha_core_agp_sizes,
125         .num_aperture_sizes     = 1,
126         .size_type              = FIXED_APER_SIZE,
127         .cant_use_aperture      = 1,
128         .masks                  = NULL,
129
130         .fetch_size             = alpha_core_agp_fetch_size,
131         .configure              = alpha_core_agp_configure,
132         .agp_enable             = alpha_core_agp_enable,
133         .cleanup                = alpha_core_agp_cleanup,
134         .tlb_flush              = alpha_core_agp_tlbflush,
135         .mask_memory            = agp_generic_mask_memory,
136         .cache_flush            = global_cache_flush,
137         .create_gatt_table      = alpha_core_agp_create_free_gatt_table,
138         .free_gatt_table        = alpha_core_agp_create_free_gatt_table,
139         .insert_memory          = alpha_core_agp_insert_memory,
140         .remove_memory          = alpha_core_agp_remove_memory,
141         .alloc_by_type          = agp_generic_alloc_by_type,
142         .free_by_type           = agp_generic_free_by_type,
143         .agp_alloc_page         = agp_generic_alloc_page,
144         .agp_destroy_page       = agp_generic_destroy_page,
145 };
146
147 struct agp_bridge_data *alpha_bridge;
148
149 int __init
150 alpha_core_agp_setup(void)
151 {
152         alpha_agp_info *agp = alpha_mv.agp_info();
153         struct pci_dev *pdev;   /* faked */
154         struct aper_size_info_fixed *aper_size;
155
156         if (!agp)
157                 return -ENODEV;
158         if (agp->ops->setup(agp))
159                 return -ENODEV;
160
161         /*
162          * Build the aperture size descriptor
163          */
164         aper_size = alpha_core_agp_sizes;
165         aper_size->size = agp->aperture.size / (1024 * 1024);
166         aper_size->num_entries = agp->aperture.size / PAGE_SIZE;
167         aper_size->page_order = __ffs(aper_size->num_entries / 1024);
168
169         /*
170          * Build a fake pci_dev struct
171          */
172         pdev = kmalloc(sizeof(struct pci_dev), GFP_KERNEL);
173         if (!pdev)
174                 return -ENOMEM;
175         pdev->vendor = 0xffff;
176         pdev->device = 0xffff;
177         pdev->sysdata = agp->hose;
178
179         alpha_bridge = agp_alloc_bridge();
180         if (!alpha_bridge)
181                 goto fail;
182
183         alpha_bridge->driver = &alpha_core_agp_driver;
184         alpha_bridge->vm_ops = &alpha_core_agp_vm_ops;
185         alpha_bridge->current_size = aper_size; /* only 1 size */
186         alpha_bridge->dev_private_data = agp;
187         alpha_bridge->dev = pdev;
188         alpha_bridge->mode = agp->capability.lw;
189
190         printk(KERN_INFO PFX "Detected AGP on hose %d\n", agp->hose->index);
191         return agp_add_bridge(alpha_bridge);
192
193  fail:
194         kfree(pdev);
195         return -ENOMEM;
196 }
197
198 static int __init agp_alpha_core_init(void)
199 {
200         if (agp_off)
201                 return -EINVAL;
202         if (alpha_mv.agp_info)
203                 return alpha_core_agp_setup();
204         return -ENODEV;
205 }
206
207 static void __exit agp_alpha_core_cleanup(void)
208 {
209         agp_remove_bridge(alpha_bridge);
210         agp_put_bridge(alpha_bridge);
211 }
212
213 module_init(agp_alpha_core_init);
214 module_exit(agp_alpha_core_cleanup);
215
216 MODULE_AUTHOR("Jeff Wiedemeier <Jeff.Wiedemeier@hp.com>");
217 MODULE_LICENSE("GPL and additional rights");