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authorMarc van der Wal <x0r+kernel@x0r.fr>2014-03-06 09:36:59 (GMT)
committerWim Van Sebroeck <wim@iguana.be>2014-03-31 11:33:55 (GMT)
commit0bcd0b6a47431d9895dc2dd6a8c4185008849131 (patch)
treef75055beb1a08be642e491595e44bbeaa381e46d /Documentation/watchdog
parent5e82ec94ac5d2d941414861654032543a75cf823 (diff)
watchdog: it87_wdt: Work around non-working CIR interrupts
On some hardware platforms, the it87_wdt watchdog resets the machine despite the watchdog daemon running and writing to /dev/watchdog. This is due to Consumer IR buffer underrun interrupts being used as triggers to reset the timer. On some buggy hardware implementations such as the iEi AFL-12A-N270 single-board computer, this method does not work. However, resetting the timer by writing its original timeout value in its configuration register over and over again suppresses the unwanted reboots. Add a module option (nocir), 0 by default in order not to break existing setups. Setting it to 1 enables the workaround. Fixes bug #42801 <https://bugzilla.kernel.org/show_bug.cgi?id=42801>. Tested primarily on Linux 3.5.7, applies cleanly on Linux 3.13.5. Signed-off-by: Marc van der Wal <x0r+kernel@x0r.fr> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'Documentation/watchdog')
-rw-r--r--Documentation/watchdog/watchdog-parameters.txt2
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/watchdog/watchdog-parameters.txt b/Documentation/watchdog/watchdog-parameters.txt
index b39f355..692791c 100644
--- a/Documentation/watchdog/watchdog-parameters.txt
+++ b/Documentation/watchdog/watchdog-parameters.txt
@@ -150,6 +150,8 @@ nowayout: Disable watchdog shutdown on close
-------------------------------------------------
it87_wdt:
nogameport: Forbid the activation of game port, default=0
+nocir: Forbid the use of CIR (workaround for some buggy setups); set to 1 if
+system resets despite watchdog daemon running, default=0
exclusive: Watchdog exclusive device open, default=1
timeout: Watchdog timeout in seconds, default=60
testmode: Watchdog test mode (1 = no reboot), default=0

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