drm/virtio: fix lock context imbalance
When virtio_gpu_free_vbufs exits due to list empty, it does not
drop the free_vbufs lock that it took.
list empty is not expected to happen anyway, but it can't hurt to fix
this and drop the lock.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 974f941..abfc54a 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -109,8 +109,10 @@ void virtio_gpu_free_vbufs(struct virtio_gpu_device *vgdev)
spin_lock(&vgdev->free_vbufs_lock);
for (i = 0; i < count; i++) {
- if (WARN_ON(list_empty(&vgdev->free_vbufs)))
+ if (WARN_ON(list_empty(&vgdev->free_vbufs))) {
+ spin_unlock(&vgdev->free_vbufs_lock);
return;
+ }
vbuf = list_first_entry(&vgdev->free_vbufs,
struct virtio_gpu_vbuffer, list);
list_del(&vbuf->list);