netdev - Re: [PATCH 1/2] genl: Fix genl dumpit() locking.

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Message-ID: <CALnjE+qgZ_UZ4GdiZ4UCzfTLn-OveoHtE28uQZokz2kPD4srXQ@mail.gmail.com>
Date:	Thu, 22 Aug 2013 10:42:01 -0700
From:	Pravin Shelar <pshelar@...ira.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	netdev <netdev@...r.kernel.org>, Jesse Gross <jesse@...ira.com>
Subject: Re: [PATCH 1/2] genl: Fix genl dumpit() locking.

On Thu, Aug 22, 2013 at 12:36 AM, Johannes Berg
<johannes@...solutions.net> wrote:
> On Wed, 2013-08-21 at 20:58 -0700, Pravin B Shelar wrote:
>> In case of genl-family with parallel ops off, dumpif() callback
>> is expected to run under genl_lock, But commit def3117493eafd9df
>> (genl: Allow concurrent genl callbacks.) changed this behaviour
>> where only first dumpit() op was called under genl-lock.
>> For subsequent dump, only nlk->cb_lock was taken.
>> Following patch fixes it by defining locked dumpit() and done()
>> callback which takes care of genl-locking.
>
> As I've commented over in the other thread, I really think this is the
> wrong thing to do. It was never the case that dumpit() was actually
> locked under genl_lock(), and adding it doesn't really help anyone.
>
If you look at commit def3117493eafd9df , it removes assignment of
cb_mutex to genl_mutex. Thats how genl-dump operation was called under
genl_mutex.
This patch simply restores that locking.
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