[PATCH net] virtio-net: Keep stop() to follow mirror sequence of open()

[PATCH net] virtio-net: Keep stop() to follow mirror sequence of open()

[Parav Pandit]

Cited commit in fixes tag frees rxq xdp info while RQ NAPI is
still enabled and packet processing may be ongoing.

Follow the mirror sequence of open() in the stop() callback.
This ensures that when rxq info is unregistered, no rx
packet processing is ongoing.

Fixes: 754b8a21a96d ("virtio_net: setup xdp_rxq_info")
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Parav Pandit <parav@nvidia.com>
---
 drivers/net/virtio_net.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 7e1a98430190..b7d0b54c3bb0 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2279,8 +2279,8 @@ static int virtnet_close(struct net_device *dev)
 	cancel_delayed_work_sync(&vi->refill);
 
 	for (i = 0; i < vi->max_queue_pairs; i++) {
-		xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
 		napi_disable(&vi->rq[i].napi);
+		xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
 		virtnet_napi_tx_disable(&vi->sq[i].napi);
 	}
 
-- 
2.26.2

Re: [PATCH net] virtio-net: Keep stop() to follow mirror sequence of open()

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Thu, 2 Feb 2023 18:35:16 +0200 you wrote:
> Cited commit in fixes tag frees rxq xdp info while RQ NAPI is
> still enabled and packet processing may be ongoing.
> 
> Follow the mirror sequence of open() in the stop() callback.
> This ensures that when rxq info is unregistered, no rx
> packet processing is ongoing.
> 
> [...]

Here is the summary with links:
  - [net] virtio-net: Keep stop() to follow mirror sequence of open()
    https://git.kernel.org/netdev/net/c/63b114042d8a

You are awesome, thank you!
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