linux-kernel - Re: [PATCH 09/16] virtio-net: drop config

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Date:	Mon, 6 Oct 2014 13:56:10 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 09/16] virtio-net: drop config_mutex

On Sun, 5 Oct 2014 19:07:16 +0300
"Michael S. Tsirkin" <mst@...hat.com> 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@...hat.com>
> ---
>  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;
>  }
> 
>  static void virtnet_config_changed(struct virtio_device *vdev)

I'd probably return directly in the remaining 'goto done;' cases, but still

Reviewed-by: Cornelia Huck <cornelia.huck@...ibm.com>

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