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drm/radeon/kms: take vram mutex pointer before derefing object. 

since derefing the object might free it.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2010-04-29 18:37:59 +10:00
parent 539d241817
commit f4b7fb94c5
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/radeon/radeon_object.c
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@ -168,13 +168,15 @@ void radeon_bo_kunmap(struct radeon_bo *bo)
void radeon_bo_unref(struct radeon_bo **bo)
{
struct ttm_buffer_object *tbo;
struct radeon_device *rdev;
if ((*bo) == NULL)
return;
rdev = (*bo)->rdev;
tbo = &((*bo)->tbo);
mutex_lock(&(*bo)->rdev->vram_mutex);
mutex_lock(&rdev->vram_mutex);
ttm_bo_unref(&tbo);
mutex_unlock(&(*bo)->rdev->vram_mutex);
mutex_unlock(&rdev->vram_mutex);
if (tbo == NULL)
*bo = NULL;
}