From: Rafael J. Wysocki <rjw@sisk.pl>
Date: Wed, 11 Jun 2008 20:09:45 +0000 (+0200)
Subject: snapshot: Use pm_mutex for mutual exclusion
X-Git-Tag: v2.6.27-rc1~1050^2~57
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=25f2f3daadaf0768a61d02ee3ed3d9a21e9dc46c;p=pandora-kernel.git

snapshot: Use pm_mutex for mutual exclusion

We can avoid taking the BKL in snapshot_ioctl() if pm_mutex is used to prevent
the ioctls from being executed concurrently.

In addition, although it is only possible to open /dev/snapshot once, the task
which has done that may spawn a child that will inherit the open descriptor,
so in theory they can call snapshot_write(), snapshot_read() and
snapshot_release() concurrently.  pm_mutex can also be used for mutual
exclusion in such cases.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Len Brown <len.brown@intel.com>
---

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