From 5d63c13415db2819590bba975dd023eaa593ddc3 Mon Sep 17 00:00:00 2001
From: Timur Tabi <timur@freescale.com>
Date: Fri, 3 Dec 2010 10:51:43 -0600
Subject: [PATCH] watchdog: add CONFIG_WATCHDOG_NOWAYOUT support to PowerPC
 Book-E watchdog driver

Normally, the watchdog is disabled when dev/watchdog is closed, but if
CONFIG_WATCHDOG_NOWAYOUT is defined, then it means that the watchdog should
remain enabled.  So we should disable it only if CONFIG_WATCHDOG_NOWAYOUT is
not defined.

Also ensure that /dev/watchdog is only opened by one process at a time.  That
way, a second process can't accidentally disable the watchdog while the first
process has it open.  There shouldn't be any need for more than one process to
open /dev/watchdog anyway.

Signed-off-by: Timur Tabi <timur@freescale.com>
Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
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