From 0b7dff4faed07f55be2a98dd0eafc02623174236 Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Wed, 5 Dec 2012 09:49:14 +0100
Subject: [PATCH] mac80211: cancel work instead of waiting for it to do nothing

If the sdata work is pending while the interface is stopped,
we currently flush it. If it's not running this means waiting
for it to run, which could take a while if the workqueue is
backlogged. However, the work exits right away if it starts
to run while the interface is already stopping. There's no
point in waiting for that, so use cancel_work_sync() instead.

Reported-by: Ben Greear <greearb@candelatech.com>
Tested-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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