From: Johannes Berg <johannes@sipsolutions.net>
Date: Sun, 11 Oct 2009 09:47:57 +0000 (+0200)
Subject: mac80211: fix ibss race
X-Git-Tag: v2.6.32-rc5~13^2~7^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=51f98f1313d2fc4b1d3a3e1f4db7cf4925b29df6;p=pandora-kernel.git

mac80211: fix ibss race

When a scan completes, we call ieee80211_sta_find_ibss(),
which is also called from other places. When the scan was
done in software, there's no problem as both run from the
single-threaded mac80211 workqueue and are thus serialised
against each other, but with hardware scan the completion
can be in a different context and race against callers of
this function from the workqueue (e.g. due to beacon RX).
So instead of calling ieee80211_sta_find_ibss() directly,
just arm the timer and have it fire, scheduling the work,
which will invoke ieee80211_sta_find_ibss() (if that is
appropriate in the current state).

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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