Hi, On Thu, Jan 07, 2021 at 09:57:30PM +0200, Tomas Winkler wrote: > From: Alexander Usyskin <alexander.usyskin@xxxxxxxxx> > > Send the stop command to the firmware on watchdog unregister > to eleminate false event on suspend. > Normally the watchdog driver would not be expected to unregister during suspend, only when the driver is manually unloaded. To support suspend/resume, other watchdog drivers implement suspend/resume functions to stop the watchdog on suspend and to restart it on resume. Unloading a watchdog driver on suspend would also have odd implications for userspace watchdog daemons. On top of that, it should not actually be possible to unregister a watchdog while it is in use (because it is open in that case and should be marked as busy). watchdog_stop_on_unregister() only serves as backup in case someone actually manages to unload the driver while the watchdog is running. The function was implemented to avoid calls to stop the watchdog in the remove function because I can not mathematically prove that there are no situations where the watchdog is unloaded while running. However, I have not actually been able to do that. Are you sure this patch is doing what you expect it to do ? Thanks, Guenter > Cc: <stable@xxxxxxxxxxxxxxx> > Signed-off-by: Alexander Usyskin <alexander.usyskin@xxxxxxxxx> > Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx> > --- > drivers/watchdog/mei_wdt.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/watchdog/mei_wdt.c b/drivers/watchdog/mei_wdt.c > index 5391bf3e6b11..c5967d8b4256 100644 > --- a/drivers/watchdog/mei_wdt.c > +++ b/drivers/watchdog/mei_wdt.c > @@ -382,6 +382,7 @@ static int mei_wdt_register(struct mei_wdt *wdt) > > watchdog_set_drvdata(&wdt->wdd, wdt); > watchdog_stop_on_reboot(&wdt->wdd); > + watchdog_stop_on_unregister(&wdt->wdd); > > ret = watchdog_register_device(&wdt->wdd); > if (ret) > -- > 2.26.2 >
