drm/i915: Correct locking in the modesetting failure path, fixing a BUG_ON.

Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 7bfded5e90bb..281faca3e37c 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1405,7 +1405,9 @@ static int i915_load_modeset_init(struct drm_device *dev,
         return 0;
 
 destroy_ringbuffer:
+        mutex_lock(&dev->struct_mutex);
         i915_gem_cleanup_ringbuffer(dev);
+        mutex_unlock(&dev->struct_mutex);
 out:
         return ret;
 }