netdev - Re: [PATCH 1/2] ipv6 mcast: use del_timer_sync instead of del_timer in ipv6_mc

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Date:	Thu, 5 Sep 2013 10:20:52 -0700
From:	Salam Noureddine <noureddine@...stanetworks.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] ipv6 mcast: use del_timer_sync instead of del_timer
 in ipv6_mc_down

On Thu, Sep 5, 2013 at 7:30 AM, Ben Hutchings <bhutchings@...arflare.com> wrote:
>> diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
>> index 99cd65c..5c8d49d 100644
>> --- a/net/ipv6/mcast.c
>> +++ b/net/ipv6/mcast.c
>> @@ -2277,12 +2277,12 @@ void ipv6_mc_down(struct inet6_dev *idev)
>>
>>       read_lock_bh(&idev->lock);
>>       idev->mc_ifc_count = 0;
>> -     if (del_timer(&idev->mc_ifc_timer))
>> +     if (del_timer_sync(&idev->mc_ifc_timer))
>
> Are you sure this doesn't introduce a potential deadlock?  Have you
> tested this with lockdep enabled?
>
> Ben.

I will test with lockdep enabled and get back to you.

Thanks,

Salam
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