From: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Date: Fri, 22 Sep 2006 17:17:29 +0000 (-0700)
Subject: pciehp - add missing locking
X-Git-Tag: v2.6.19-rc3~125^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dd5619cb4407e830a8921a93c949be37c81105b5;p=pandora-kernel.git

pciehp - add missing locking

This patch fixes the problem that system will panic if multiple power
on/off operations are issued to the same slot in parallel. This
problem can be easily reproduced by commands below.

    # while true; do echo 1 > power; echo 0 > power; done &
    # while true; do echo 1 > power; echo 0 > power; done &

The cause is lack of locking for enable/disable operations. This patch
fixes this problem.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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