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Subject[PATCH] virtio_net: suppress cpu stall when free_unused_bufs
Date
For multi-queue and large rx-ring-size use case, the following error
occurred when free_unused_bufs:
rcu: INFO: rcu_sched self-detected stall on CPU.

Signed-off-by: Wenliang Wang <wangwenliang.1995@bytedance.com>
---
drivers/net/virtio_net.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index ea1bd4bb326d..21d8382fd2c7 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -3565,6 +3565,7 @@ static void free_unused_bufs(struct virtnet_info *vi)
struct virtqueue *vq = vi->rq[i].vq;
while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
virtnet_rq_free_unused_buf(vq, buf);
+ schedule();
}
}

--
2.20.1
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