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virtio-net: on tx, only call napi_disable if tx napi is on

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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 <jasowang@redhat.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn 2017-04-25 15:59:17 -04:00 committed by David S. Miller
parent 1f7fe5d492
commit 78a57b482a
1 changed files with 8 additions and 2 deletions
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10
drivers/net/virtio_net.c
View file

@ -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);
}
}
}