From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752566AbaJFMbp (ORCPT ); Mon, 6 Oct 2014 08:31:45 -0400 Received: from mail-la0-f47.google.com ([209.85.215.47]:63012 "EHLO mail-la0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752109AbaJFMbl (ORCPT ); Mon, 6 Oct 2014 08:31:41 -0400 Message-ID: <54328BAC.2000501@cogentembedded.com> Date: Mon, 06 Oct 2014 16:31:40 +0400 From: Sergei Shtylyov User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.1.2 MIME-Version: 1.0 To: "Michael S. Tsirkin" CC: linux-kernel@vger.kernel.org, Rusty Russell , virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Subject: Re: [PATCH 09/16] virtio-net: drop config_mutex References: <1412525038-15871-1-git-send-email-mst@redhat.com> <1412525038-15871-10-git-send-email-mst@redhat.com> <54328107.5090400@cogentembedded.com> <20141006115636.GA26184@redhat.com> <54328604.30403@cogentembedded.com> <20141006122215.GA26790@redhat.com> In-Reply-To: <20141006122215.GA26790@redhat.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/6/2014 4:22 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 >>>>> --- >>>>> 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 > If I don't add it, gcc generates a compiler warning: it does not like > labels at the end of functions. Ahh... nevermind then. WBR, Sergei