From: Jan Kiszka Date: Sun, 1 Aug 2021 07:56:25 +0000 (+0200) Subject: watchdog: Start watchdog in watchdog_set_last_hw_keepalive only if appropriate X-Git-Tag: v5.15-rc1~64^2~2 X-Git-Url: https://repo.jachan.dev/linux.git/commitdiff_plain/dbe80cf471f940db3063197b7adb1169f89be9ed watchdog: Start watchdog in watchdog_set_last_hw_keepalive only if appropriate We must not pet a running watchdog when handle_boot_enabled is off because this will kick off automatic triggering before userland is running, defeating the purpose of the handle_boot_enabled control. Furthermore, don't ping in case watchdog_set_last_hw_keepalive was called incorrectly when the hardware watchdog is actually not running. Fixed: cef9572e9af3 ("watchdog: add support for adjusting last known HW keepalive time") Signed-off-by: Jan Kiszka Reviewed-by: Guenter Roeck Link: https://lore.kernel.org/r/93d56386-6e37-060b-55ce-84de8cde535f@web.de Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c index 597cf16ea4ba..3a3d8b5c7ad5 100644 --- a/drivers/watchdog/watchdog_dev.c +++ b/drivers/watchdog/watchdog_dev.c @@ -1173,7 +1173,10 @@ int watchdog_set_last_hw_keepalive(struct watchdog_device *wdd, wd_data->last_hw_keepalive = ktime_sub(now, ms_to_ktime(last_ping_ms)); - return __watchdog_ping(wdd); + if (watchdog_hw_running(wdd) && handle_boot_enabled) + return __watchdog_ping(wdd); + + return 0; } EXPORT_SYMBOL_GPL(watchdog_set_last_hw_keepalive);