From: Eliad Peller <eliad@wizery.com>
Date: Sun, 9 Sep 2012 11:43:51 +0000 (+0300)
Subject: mac80211: use call_rcu() on sta deletion
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~47^2~31^2^2~67^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b22cfcfcae5b2c1e9b43543b6a23e5ef517de8f8;p=pandora-kernel.git

mac80211: use call_rcu() on sta deletion

mac80211 calls synchronize_rcu() on sta deletion,
which increase the roaming time significantly.

Convert it into a call_rcu() mechanism, in order
to avoid blocking. Since some of the cleanup
functions might sleep, schedule from the call_rcu
callback a new work that will do the actual cleanup.

In order to make sure the cleanup occurs before
the interface went down, flush local->workqueue
on ieee80211_do_stop().

Signed-off-by: Yoni Divinsky <yoni.divinsky@ti.com>
Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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