From mboxrd@z Thu Jan 1 00:00:00 1970 From: Willem de Bruijn Subject: [PATCH net-next] virtio-net: on tx, only call napi_disable if tx napi is on Date: Tue, 25 Apr 2017 15:59:17 -0400 Message-ID: <20170425195917.54209-1-willemdebruijn.kernel@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Willem de Bruijn , virtualization@lists.linux-foundation.org, davem@davemloft.net, mst@redhat.com To: netdev@vger.kernel.org Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org List-Id: netdev.vger.kernel.org From: Willem de Bruijn As of tx napi, device down (`ip link set dev $dev down`) hangs unless tx napi is enabled. Else napi_enable is not called, so napi_disable will spin on test_and_set_bit NAPI_STATE_SCHED. Only call napi_disable if tx napi is enabled. Fixes: 5a719c2552ca ("virtio-net: transmit napi") Reported-by: Jason Wang Signed-off-by: Willem de Bruijn --- drivers/net/virtio_net.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 003143835766..82f1c3a73345 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -997,6 +997,12 @@ static void virtnet_napi_tx_enable(struct virtnet_info *vi, return virtnet_napi_enable(vq, napi); } +static void virtnet_napi_tx_disable(struct napi_struct *napi) +{ + if (napi->weight) + napi_disable(napi); +} + static void refill_work(struct work_struct *work) { struct virtnet_info *vi = @@ -1445,7 +1451,7 @@ static int virtnet_close(struct net_device *dev) for (i = 0; i < vi->max_queue_pairs; i++) { napi_disable(&vi->rq[i].napi); - napi_disable(&vi->sq[i].napi); + virtnet_napi_tx_disable(&vi->sq[i].napi); } return 0; @@ -1803,7 +1809,7 @@ static void virtnet_freeze_down(struct virtio_device *vdev) if (netif_running(vi->dev)) { for (i = 0; i < vi->max_queue_pairs; i++) { napi_disable(&vi->rq[i].napi); - napi_disable(&vi->sq[i].napi); + virtnet_napi_tx_disable(&vi->sq[i].napi); } } } -- 2.13.0.rc0.306.g87b477812d-goog