Commit f8bb5104 authored by Wenliang Wang's avatar Wenliang Wang Committed by David S. Miller
Browse files

virtio_net: suppress cpu stall when free_unused_bufs 



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: 986a4f4d ("virtio_net: multiqueue support")
Signed-off-by: default avatarWenliang Wang <wangwenliang.1995@bytedance.com>
Acked-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9f699b71

drivers/net/virtio_net.c

+2 −0
Original line number Diff line number Diff line
@@ -3560,12 +3560,14 @@ 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();

	}

}