Hi Guenter, > On Tue, May 28, 2013 at 10:10:53AM +0200, Johannes Thumshirn wrote: > > On Mon, May 27, 2013 at 08:25:54PM +0200, Wim Van Sebroeck wrote: > > [...] > > > > + watchdog_set_drvdata(&a21_wdt, drv); > > > > > > I am missing the initialisation of the watchdog's timeout value here... > > > > This watchdog only knows two timeout values, 1s and 30s with the constraint > > that you can't go back to 30s once your in a 1s timeout without a reset of the > > CPLD. I could initially set it to 30s but that would be redundant. > > > I wonder - why bother with supporting one-second timeouts ? > > Is this realistic, ie can you guarantee that the watchdog will be pinged fast > enough to keep the system alive under all load conditions ? As far as I know > you can not even configure the watchdog application for less than 1 second > ping intervals. that's why certain drivers use a timer to keep kicking the watchdog at a rate of 0.5s (do a grep on HZ/2) untill userspace times out. (example: drivers/watchdog/pika_wdt.c or drivers/watchdog/pcwd.c). Kind regards, Wim. -- To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
