drm: rename dev->count_lock to dev->buf_lock

Since really that's all it protects - legacy horror stories in
drm_bufs.c. Since I don't want to waste any more time on this I didn't
bother to actually look at what it protects in there, but it's at
least contained now.

v2: Move the spurious hunk to the right patch (Thierry).

Cc: Thierry Reding <thierry.reding@gmail.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

3 files changed, 18 insertions, 18 deletions

diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c
index edec31fe3fed..ef7f0199a0f1 100644
--- a/drivers/gpu/drm/drm_bufs.c
+++ b/drivers/gpu/drm/drm_bufs.c
@@ -656,13 +656,13 @@ int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
                 DRM_DEBUG("zone invalid\n");
                 return -EINVAL;
         }
-        spin_lock(&dev->count_lock);
+        spin_lock(&dev->buf_lock);
         if (dev->buf_use) {
-                spin_unlock(&dev->count_lock);
+                spin_unlock(&dev->buf_lock);
                 return -EBUSY;
         }
         atomic_inc(&dev->buf_alloc);
-        spin_unlock(&dev->count_lock);
+        spin_unlock(&dev->buf_lock);
 
         mutex_lock(&dev->struct_mutex);
         entry = &dma->bufs[order];
@@ -805,13 +805,13 @@ int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
         total = PAGE_SIZE << page_order;
 
-        spin_lock(&dev->count_lock);
+        spin_lock(&dev->buf_lock);
         if (dev->buf_use) {
-                spin_unlock(&dev->count_lock);
+                spin_unlock(&dev->buf_lock);
                 return -EBUSY;
         }
         atomic_inc(&dev->buf_alloc);
-        spin_unlock(&dev->count_lock);
+        spin_unlock(&dev->buf_lock);
 
         mutex_lock(&dev->struct_mutex);
         entry = &dma->bufs[order];
@@ -1015,13 +1015,13 @@ static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request
         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
                 return -EINVAL;
 
-        spin_lock(&dev->count_lock);
+        spin_lock(&dev->buf_lock);
         if (dev->buf_use) {
-                spin_unlock(&dev->count_lock);
+                spin_unlock(&dev->buf_lock);
                 return -EBUSY;
         }
         atomic_inc(&dev->buf_alloc);
-        spin_unlock(&dev->count_lock);
+        spin_unlock(&dev->buf_lock);
 
         mutex_lock(&dev->struct_mutex);
         entry = &dma->bufs[order];
@@ -1175,7 +1175,7 @@ int drm_addbufs(struct drm_device *dev, void *data,
  * \param arg pointer to a drm_buf_info structure.
  * \return zero on success or a negative number on failure.
  *
- * Increments drm_device::buf_use while holding the drm_device::count_lock
+ * Increments drm_device::buf_use while holding the drm_device::buf_lock
  * lock, preventing of allocating more buffers after this call. Information
  * about each requested buffer is then copied into user space.
  */
@@ -1196,13 +1196,13 @@ int drm_infobufs(struct drm_device *dev, void *data,
         if (!dma)
                 return -EINVAL;
 
-        spin_lock(&dev->count_lock);
+        spin_lock(&dev->buf_lock);
         if (atomic_read(&dev->buf_alloc)) {
-                spin_unlock(&dev->count_lock);
+                spin_unlock(&dev->buf_lock);
                 return -EBUSY;
         }
         ++dev->buf_use;         /* Can't allocate more after this call */
-        spin_unlock(&dev->count_lock);
+        spin_unlock(&dev->buf_lock);
 
         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
                 if (dma->bufs[i].buf_count)
@@ -1381,13 +1381,13 @@ int drm_mapbufs(struct drm_device *dev, void *data,
         if (!dma)
                 return -EINVAL;
 
-        spin_lock(&dev->count_lock);
+        spin_lock(&dev->buf_lock);
         if (atomic_read(&dev->buf_alloc)) {
-                spin_unlock(&dev->count_lock);
+                spin_unlock(&dev->buf_lock);
                 return -EBUSY;
         }
         dev->buf_use++;         /* Can't allocate more after this call */
-        spin_unlock(&dev->count_lock);
+        spin_unlock(&dev->buf_lock);
 
         if (request->count >= dma->buf_count) {
                 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
diff --git a/drivers/gpu/drm/drm_stub.c b/drivers/gpu/drm/drm_stub.c
index 4c24c3ac1efa..5394b201c3d0 100644
--- a/drivers/gpu/drm/drm_stub.c
+++ b/drivers/gpu/drm/drm_stub.c
@@ -569,7 +569,7 @@ struct drm_device *drm_dev_alloc(struct drm_driver *driver,
         INIT_LIST_HEAD(&dev->maplist);
         INIT_LIST_HEAD(&dev->vblank_event_list);
 
-        spin_lock_init(&dev->count_lock);
+        spin_lock_init(&dev->buf_lock);
         spin_lock_init(&dev->event_lock);
         mutex_init(&dev->struct_mutex);
         mutex_init(&dev->ctxlist_mutex);
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index a20d882ca265..85682d959c7e 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1069,7 +1069,6 @@ struct drm_device {
 
         /** \name Locks */
         /*@{ */
-        spinlock_t count_lock;          /**< For inuse, drm_device::open_count, drm_device::buf_use */
         struct mutex struct_mutex;      /**< For others */
         struct mutex master_mutex;      /**< For drm_minor::master and drm_file::is_master */
         /*@} */
@@ -1077,6 +1076,7 @@ struct drm_device {
         /** \name Usage Counters */
         /*@{ */
         int open_count;                 /**< Outstanding files open, protected by drm_global_mutex. */
+        spinlock_t buf_lock;            /**< For drm_device::buf_use and a few other things. */
         int buf_use;                    /**< Buffers in use -- cannot alloc */
         atomic_t buf_alloc;             /**< Buffer allocation in progress */
         /*@} */