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>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index 06def708b014..a8d18bcae7db 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -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;
 }