From: Alexander Usyskin alexander.usyskin@intel.com
commit 740c0a57b8f1e36301218bf549f3c9cc833a60be upstream.
The MEI bus has a special behavior on suspend it destroys all the attached devices, this is due to the fact that also firmware context is not persistent across power flows.
If watchdog on MEI bus is ticking before suspending the firmware times out and reports that the OS is missing watchdog tick. Send the stop command to the firmware on watchdog unregistered to eliminate the false event on suspend. This does not make the things worse from the user-space perspective as a user-space should re-open watchdog device after suspending before this patch.
Cc: stable@vger.kernel.org Signed-off-by: Alexander Usyskin alexander.usyskin@intel.com Signed-off-by: Tomas Winkler tomas.winkler@intel.com Reviewed-by: Guenter Roeck linux@roeck-us.net Link: https://lore.kernel.org/r/20210124114938.373885-1-tomas.winkler@intel.com Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Wim Van Sebroeck wim@linux-watchdog.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/watchdog/mei_wdt.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/watchdog/mei_wdt.c +++ b/drivers/watchdog/mei_wdt.c @@ -382,6 +382,7 @@ static int mei_wdt_register(struct mei_w
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) {