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path: root/drivers/char/drm/drm_auth.c
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Diffstat (limited to 'drivers/char/drm/drm_auth.c')
-rw-r--r--drivers/char/drm/drm_auth.c68
1 files changed, 35 insertions, 33 deletions
diff --git a/drivers/char/drm/drm_auth.c b/drivers/char/drm/drm_auth.c
index dd140bca8f71..a47b502bc7cc 100644
--- a/drivers/char/drm/drm_auth.c
+++ b/drivers/char/drm/drm_auth.c
@@ -1,5 +1,5 @@
1/** 1/**
2 * \file drm_auth.h 2 * \file drm_auth.c
3 * IOCTLs for authentication 3 * IOCTLs for authentication
4 * 4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com> 5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
@@ -46,7 +46,7 @@
46 */ 46 */
47static int drm_hash_magic(drm_magic_t magic) 47static int drm_hash_magic(drm_magic_t magic)
48{ 48{
49 return magic & (DRM_HASH_SIZE-1); 49 return magic & (DRM_HASH_SIZE - 1);
50} 50}
51 51
52/** 52/**
@@ -59,11 +59,11 @@ static int drm_hash_magic(drm_magic_t magic)
59 * the one with matching magic number, while holding the drm_device::struct_sem 59 * the one with matching magic number, while holding the drm_device::struct_sem
60 * lock. 60 * lock.
61 */ 61 */
62static drm_file_t *drm_find_file(drm_device_t *dev, drm_magic_t magic) 62static drm_file_t *drm_find_file(drm_device_t * dev, drm_magic_t magic)
63{ 63{
64 drm_file_t *retval = NULL; 64 drm_file_t *retval = NULL;
65 drm_magic_entry_t *pt; 65 drm_magic_entry_t *pt;
66 int hash = drm_hash_magic(magic); 66 int hash = drm_hash_magic(magic);
67 67
68 down(&dev->struct_sem); 68 down(&dev->struct_sem);
69 for (pt = dev->magiclist[hash].head; pt; pt = pt->next) { 69 for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {
@@ -78,7 +78,7 @@ static drm_file_t *drm_find_file(drm_device_t *dev, drm_magic_t magic)
78 78
79/** 79/**
80 * Adds a magic number. 80 * Adds a magic number.
81 * 81 *
82 * \param dev DRM device. 82 * \param dev DRM device.
83 * \param priv file private data. 83 * \param priv file private data.
84 * \param magic magic number. 84 * \param magic magic number.
@@ -87,28 +87,30 @@ static drm_file_t *drm_find_file(drm_device_t *dev, drm_magic_t magic)
87 * associated the magic number hash key in drm_device::magiclist, while holding 87 * associated the magic number hash key in drm_device::magiclist, while holding
88 * the drm_device::struct_sem lock. 88 * the drm_device::struct_sem lock.
89 */ 89 */
90static int drm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic) 90static int drm_add_magic(drm_device_t * dev, drm_file_t * priv,
91 drm_magic_t magic)
91{ 92{
92 int hash; 93 int hash;
93 drm_magic_entry_t *entry; 94 drm_magic_entry_t *entry;
94 95
95 DRM_DEBUG("%d\n", magic); 96 DRM_DEBUG("%d\n", magic);
96 97
97 hash = drm_hash_magic(magic); 98 hash = drm_hash_magic(magic);
98 entry = drm_alloc(sizeof(*entry), DRM_MEM_MAGIC); 99 entry = drm_alloc(sizeof(*entry), DRM_MEM_MAGIC);
99 if (!entry) return -ENOMEM; 100 if (!entry)
101 return -ENOMEM;
100 memset(entry, 0, sizeof(*entry)); 102 memset(entry, 0, sizeof(*entry));
101 entry->magic = magic; 103 entry->magic = magic;
102 entry->priv = priv; 104 entry->priv = priv;
103 entry->next = NULL; 105 entry->next = NULL;
104 106
105 down(&dev->struct_sem); 107 down(&dev->struct_sem);
106 if (dev->magiclist[hash].tail) { 108 if (dev->magiclist[hash].tail) {
107 dev->magiclist[hash].tail->next = entry; 109 dev->magiclist[hash].tail->next = entry;
108 dev->magiclist[hash].tail = entry; 110 dev->magiclist[hash].tail = entry;
109 } else { 111 } else {
110 dev->magiclist[hash].head = entry; 112 dev->magiclist[hash].head = entry;
111 dev->magiclist[hash].tail = entry; 113 dev->magiclist[hash].tail = entry;
112 } 114 }
113 up(&dev->struct_sem); 115 up(&dev->struct_sem);
114 116
@@ -117,19 +119,18 @@ static int drm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic)
117 119
118/** 120/**
119 * Remove a magic number. 121 * Remove a magic number.
120 * 122 *
121 * \param dev DRM device. 123 * \param dev DRM device.
122 * \param magic magic number. 124 * \param magic magic number.
123 * 125 *
124 * Searches and unlinks the entry in drm_device::magiclist with the magic 126 * Searches and unlinks the entry in drm_device::magiclist with the magic
125 * number hash key, while holding the drm_device::struct_sem lock. 127 * number hash key, while holding the drm_device::struct_sem lock.
126 */ 128 */
127static int drm_remove_magic(drm_device_t *dev, drm_magic_t magic) 129static int drm_remove_magic(drm_device_t * dev, drm_magic_t magic)
128{ 130{
129 drm_magic_entry_t *prev = NULL; 131 drm_magic_entry_t *prev = NULL;
130 drm_magic_entry_t *pt; 132 drm_magic_entry_t *pt;
131 int hash; 133 int hash;
132
133 134
134 DRM_DEBUG("%d\n", magic); 135 DRM_DEBUG("%d\n", magic);
135 hash = drm_hash_magic(magic); 136 hash = drm_hash_magic(magic);
@@ -171,21 +172,22 @@ static int drm_remove_magic(drm_device_t *dev, drm_magic_t magic)
171 * filp. 172 * filp.
172 */ 173 */
173int drm_getmagic(struct inode *inode, struct file *filp, 174int drm_getmagic(struct inode *inode, struct file *filp,
174 unsigned int cmd, unsigned long arg) 175 unsigned int cmd, unsigned long arg)
175{ 176{
176 static drm_magic_t sequence = 0; 177 static drm_magic_t sequence = 0;
177 static DEFINE_SPINLOCK(lock); 178 static DEFINE_SPINLOCK(lock);
178 drm_file_t *priv = filp->private_data; 179 drm_file_t *priv = filp->private_data;
179 drm_device_t *dev = priv->head->dev; 180 drm_device_t *dev = priv->head->dev;
180 drm_auth_t auth; 181 drm_auth_t auth;
181 182
182 /* Find unique magic */ 183 /* Find unique magic */
183 if (priv->magic) { 184 if (priv->magic) {
184 auth.magic = priv->magic; 185 auth.magic = priv->magic;
185 } else { 186 } else {
186 do { 187 do {
187 spin_lock(&lock); 188 spin_lock(&lock);
188 if (!sequence) ++sequence; /* reserve 0 */ 189 if (!sequence)
190 ++sequence; /* reserve 0 */
189 auth.magic = sequence++; 191 auth.magic = sequence++;
190 spin_unlock(&lock); 192 spin_unlock(&lock);
191 } while (drm_find_file(dev, auth.magic)); 193 } while (drm_find_file(dev, auth.magic));
@@ -194,7 +196,7 @@ int drm_getmagic(struct inode *inode, struct file *filp,
194 } 196 }
195 197
196 DRM_DEBUG("%u\n", auth.magic); 198 DRM_DEBUG("%u\n", auth.magic);
197 if (copy_to_user((drm_auth_t __user *)arg, &auth, sizeof(auth))) 199 if (copy_to_user((drm_auth_t __user *) arg, &auth, sizeof(auth)))
198 return -EFAULT; 200 return -EFAULT;
199 return 0; 201 return 0;
200} 202}
@@ -211,14 +213,14 @@ int drm_getmagic(struct inode *inode, struct file *filp,
211 * Checks if \p filp is associated with the magic number passed in \arg. 213 * Checks if \p filp is associated with the magic number passed in \arg.
212 */ 214 */
213int drm_authmagic(struct inode *inode, struct file *filp, 215int drm_authmagic(struct inode *inode, struct file *filp,
214 unsigned int cmd, unsigned long arg) 216 unsigned int cmd, unsigned long arg)
215{ 217{
216 drm_file_t *priv = filp->private_data; 218 drm_file_t *priv = filp->private_data;
217 drm_device_t *dev = priv->head->dev; 219 drm_device_t *dev = priv->head->dev;
218 drm_auth_t auth; 220 drm_auth_t auth;
219 drm_file_t *file; 221 drm_file_t *file;
220 222
221 if (copy_from_user(&auth, (drm_auth_t __user *)arg, sizeof(auth))) 223 if (copy_from_user(&auth, (drm_auth_t __user *) arg, sizeof(auth)))
222 return -EFAULT; 224 return -EFAULT;
223 DRM_DEBUG("%u\n", auth.magic); 225 DRM_DEBUG("%u\n", auth.magic);
224 if ((file = drm_find_file(dev, auth.magic))) { 226 if ((file = drm_find_file(dev, auth.magic))) {