On 2016年05月26日 14:27, wangyunjian wrote:
In function virtnet_open() and virtnet_probe(), func try_fill_recv()
will be executed at the same time. VQ in virtqueue_add() is not protected
well and BUG_ON will be triggered when virito_net.ko being removed.
Signed-off-by: Yunjian Wang <wangyunj...@huawei.com>
---
drivers/net/virtio_net.c | 18 ++----------------
1 file changed, 2 insertions(+), 16 deletions(-)
The patch is needed for stable.
Acked-by: Jason Wang <jasow...@redhat.com>
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 49d84e5..e0638e5 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);
--
1.7.12.4
