From f862e60f8d52dae33c9f72afc20fab691a89f0bd Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Mon, 5 Dec 2016 22:36:56 +0200 Subject: [PATCH] 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 --- 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 974f9410474b..abfc54a18f1a 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); -- 2.39.5