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| author | Marc van der Wal <x0r+kernel@x0r.fr> | 2014-03-06 10:36:59 +0100 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2014-03-31 13:33:55 +0200 |
| commit | 0bcd0b6a47431d9895dc2dd6a8c4185008849131 (patch) | |
| tree | f75055beb1a08be642e491595e44bbeaa381e46d /Documentation/watchdog | |
| parent | 5e82ec94ac5d2d941414861654032543a75cf823 (diff) | |
| download | lwn-0bcd0b6a47431d9895dc2dd6a8c4185008849131.tar.gz lwn-0bcd0b6a47431d9895dc2dd6a8c4185008849131.zip | |
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.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/watchdog/watchdog-parameters.txt b/Documentation/watchdog/watchdog-parameters.txt index b39f35596ba2..692791cc674c 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 |