From f00e35e259948b995aa1f3ee7fddb05f34a50157 Mon Sep 17 00:00:00 2001 From: wangyunjian Date: Tue, 31 May 2016 11:52:43 +0800 Subject: [PATCH] virtio_net: fix virtnet_open and virtnet_probe competing for try_fill_recv In function virtnet_open() and virtnet_probe(), func try_fill_recv() may be executed at the same time. VQ in virtqueue_add() has not been protected well and BUG_ON will be triggered when virito_net.ko being removed. Signed-off-by: Yunjian Wang Acked-by: Jason Wang Acked-by: Michael S. Tsirkin Signed-off-by: David S. Miller --- drivers/net/virtio_net.c | 18 ++---------------- 1 file changed, 2 insertions(+), 16 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 49d84e540343..e0638e556fe7 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -1925,24 +1925,11 @@ static int virtnet_probe(struct virtio_device *vdev) virtio_device_ready(vdev); - /* Last of all, set up some receive buffers. */ - for (i = 0; i < vi->curr_queue_pairs; i++) { - try_fill_recv(vi, &vi->rq[i], GFP_KERNEL); - - /* If we didn't even get one input buffer, we're useless. */ - if (vi->rq[i].vq->num_free == - virtqueue_get_vring_size(vi->rq[i].vq)) { - free_unused_bufs(vi); - err = -ENOMEM; - goto free_recv_bufs; - } - } - vi->nb.notifier_call = &virtnet_cpu_callback; err = register_hotcpu_notifier(&vi->nb); if (err) { pr_debug("virtio_net: registering cpu notifier failed\n"); - goto free_recv_bufs; + goto free_unregister_netdev; } /* Assume link up if device can't report link status, @@ -1960,10 +1947,9 @@ static int virtnet_probe(struct virtio_device *vdev) return 0; -free_recv_bufs: +free_unregister_netdev: vi->vdev->config->reset(vdev); - free_receive_bufs(vi); unregister_netdev(dev); free_vqs: cancel_delayed_work_sync(&vi->refill); -- 2.30.2