Messages in this thread Patch in this message | | | Date | Tue, 6 Dec 2016 17:40:42 +0200 | From | "Michael S. Tsirkin" <> | Subject | [PATCH 03/10] drm/virtio: fix lock context imbalance |
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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> --- drivers/gpu/drm/virtio/virtgpu_vq.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c index 5a0f8a7..2f0c2f9 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); -- MST
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