From: Wenliang Wang wangwenliang.1995@bytedance.com
[ Upstream commit f8bb5104394560e29017c25bcade4c6b7aabd108 ]
For multi-queue and large ring-size use case, the following error occurred when free_unused_bufs: rcu: INFO: rcu_sched self-detected stall on CPU.
Fixes: 986a4f4d452d ("virtio_net: multiqueue support") Signed-off-by: Wenliang Wang wangwenliang.1995@bytedance.com Acked-by: Michael S. Tsirkin mst@redhat.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/virtio_net.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index cff3e2a7ce7fc..9f2d691908b42 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -2844,12 +2844,14 @@ static void free_unused_bufs(struct virtnet_info *vi) struct virtqueue *vq = vi->sq[i].vq; while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) virtnet_sq_free_unused_buf(vq, buf); + cond_resched(); }
for (i = 0; i < vi->max_queue_pairs; i++) { struct virtqueue *vq = vi->rq[i].vq; while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) virtnet_rq_free_unused_buf(vq, buf); + cond_resched(); } }