netdev - sock_hold and sock

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Message-ID: <CAGZFCEHHXbnsSoBaTUdxqwoQ75hN5BTBXJMEXp0dkwQbFSEkRw@mail.gmail.com>
Date:	Wed, 24 Jun 2015 14:47:35 +0530
From:	ratheesh kannoth <ratheesh.ksz@...il.com>
To:	netdev <netdev@...r.kernel.org>,
	linux-newbie <linux-newbie@...r.kernel.org>
Subject: sock_hold and sock_put

Hi list,

There is a comment on sock_hold() function -

561 /* Grab socket reference count. This operation is valid only
562    when sk is ALREADY grabbed f.e. it is found in hash table
563    or a list and the lookup is made under lock preventing hash table
564    modifications.
565  */

But i could see instances of sock hold() in kernel  without any locks.

How  the race between sock_hold() and sock_put() is prevented in  smp ?

note: I would like to use sock_hold() and sock_put() in
netdev_notifier chain call back functions.

-Ratheesh
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