From: Pravin B Shelar <pshelar@nicira.com>
Date: Tue, 23 Apr 2013 07:48:30 +0000 (+0000)
Subject: genl: Allow concurrent genl callbacks.
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~65^2~32
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=def3117493eafd9dfa1f809d861e0031b2cc8a07;p=pandora-kernel.git

genl: Allow concurrent genl callbacks.

All genl callbacks are serialized by genl-mutex. This can become
bottleneck in multi threaded case.
Following patch adds an parameter to genl_family so that a
particular family can get concurrent netlink callback without
genl_lock held.
New rw-sem is used to protect genl callback from genl family unregister.
in case of parallel_ops genl-family read-lock is taken for callbacks and
write lock is taken for register or unregistration for any family.
In case of locked genl family semaphore and gel-mutex is locked for
any openration.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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