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authorGrzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>2021-06-18 22:50:33 +0300
committerWim Van Sebroeck <wim@linux-watchdog.org>2021-08-22 11:28:08 +0300
commit14244b7c04d6611388e9312059df11b9c39a4f6c (patch)
treed6f8b4c189cd9e2baf5c4256cb457378981ee971 /drivers/watchdog/imx2_wdt.c
parent60bcd91aafd22ef62cef9ae2037fa2e1d4da2fb3 (diff)
downloadlinux-14244b7c04d6611388e9312059df11b9c39a4f6c.tar.xz
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: Michal Koziel <michal.koziel@emlogic.no> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20210618195033.3209598-3-grzegorz.jaszczyk@linaro.org Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'drivers/watchdog/imx2_wdt.c')
-rw-r--r--drivers/watchdog/imx2_wdt.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
index cc86018c5eb5..51bfb796898b 100644
--- a/drivers/watchdog/imx2_wdt.c
+++ b/drivers/watchdog/imx2_wdt.c
@@ -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);