Re: [PATCH 09/16] virtio-net: drop config_mutex

[Sergei Shtylyov]

On 10/6/2014 3:56 PM, Michael S. Tsirkin wrote:

> > > config_mutex served two purposes: prevent multiple concurrent config
> > > change handlers, and synchronize access to config_enable flag.

> > > Since commit dbf2576e37da0fcc7aacbfbb9fd5d3de7888a3c1
> > >      workqueue: make all workqueues non-reentrant
> > > all workqueues are non-reentrant, and config_enable
> > > is now gone.

> > > Get rid of the unnecessary lock.

> > > Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
> > > ---
> > >   drivers/net/virtio_net.c | 7 +------
> > >   1 file changed, 1 insertion(+), 6 deletions(-)

> > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> > > index fa17afa..d80fef4 100644
> > > --- a/drivers/net/virtio_net.c
> > > +++ b/drivers/net/virtio_net.c
> > [...]
> > > @@ -1430,7 +1426,7 @@ static void virtnet_config_changed_work(struct work_struct *work)
> > >   		netif_tx_stop_all_queues(vi->dev);
> > >   	}
> > >   done:
> > > -	mutex_unlock(&vi->config_lock);
> > > +	return;

> >     There's no need for this *return*.

> I know - it's removed by the follow-up patch.

   Yeah, I saw.

> It's formatted like this to make diff smaller
> and make review easier.

   Don't understand how adding this line makes diff smaller though...
You first need to add it and then to delete it, where's the save?

WBR, Sergei

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