Thread (1 message) flat view 1 message, 1 author, 2016-12-07

Re: [PATCH 03/10] drm/virtio: fix lock context imbalance

From: Jason Wang <hidden>
Date: 2016-12-07 04:13:57
Also in: dri-devel, lkml


On 2016年12月06日 23:40, Michael S. Tsirkin wrote:
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(-)
Reviewed-by: Jason Wang <redacted>
quoted hunk
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);
_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help