Commit 14244b7c authored by Grzegorz Jaszczyk's avatar Grzegorz Jaszczyk Committed by Wim Van Sebroeck
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watchdog: imx2_wdg: notify wdog core to stop ping worker on suspend 



Suspend routine disables wdog clk. Nevertheless, the watchdog subsystem
is not aware of that and can still try to ping wdog through
watchdog_ping_work. In order to prevent such condition and therefore
prevent from system hang (caused by the wdog register access issued
while the wdog clock is disabled) notify watchdog core that the ping
worker should be canceled during watchdog core suspend and restored
during resume.

Signed-off-by: default avatarMichal Koziel <michal.koziel@emlogic.no>
Signed-off-by: default avatarGrzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20210618195033.3209598-3-grzegorz.jaszczyk@linaro.org


Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@linux-watchdog.org>
parent 60bcd91a

drivers/watchdog/imx2_wdt.c

+1 −0
Original line number Diff line number Diff line
@@ -317,6 +317,7 @@ static int __init imx2_wdt_probe(struct platform_device *pdev) 
	watchdog_set_nowayout(wdog, nowayout);

	watchdog_set_restart_priority(wdog, 128);

	watchdog_init_timeout(wdog, timeout, dev);

	watchdog_stop_ping_on_suspend(wdog);



	if (imx2_wdt_is_running(wdev)) {

		imx2_wdt_set_timeout(wdog, wdog->timeout);