From: Daniel Drake <dsd@laptop.org>
Date: Tue, 11 Jun 2013 19:40:20 +0000 (-0400)
Subject: Bluetooth: btmrvl: fix thread stopping race
X-Git-Tag: v3.10~13^2~34^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ea05fea9042620ac3b8ab9a3e5e4d2ed80c89244;p=pandora-kernel.git

Bluetooth: btmrvl: fix thread stopping race

There is currently a race condition in the btmrvl_remove_card() which
is causing hangs on suspend for OLPC. When the race occurs,
kthread_stop() never returns.

The problem is that btmrvl_service_main_thread() calls kthread_should_stop()
and then does a fair number of things before restarting the loop and
sleeping.

If the thread gets stopped after kthread_should_stop() is checked, but
before the sleep happens, the thread will go to sleep and won't necessarily
be woken up.

Move the kthread_should_stop() check into a race-free place.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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