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SubjectRe: [PATCH 09/16] virtio-net: drop config_mutex
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 <mst@redhat.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;

>>>> 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



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