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authorJan Kiszka <jan.kiszka@siemens.com>2021-08-01 10:56:25 +0300
committerWim Van Sebroeck <wim@linux-watchdog.org>2021-08-22 11:28:12 +0300
commitdbe80cf471f940db3063197b7adb1169f89be9ed (patch)
treebc2ba2cc5a2addc328106ceab06ef7a9387645fa
parent585ba602b1ff76dd6e7fbd488a8c5921ae422305 (diff)
downloadlinux-dbe80cf471f940db3063197b7adb1169f89be9ed.tar.xz
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 <jan.kiszka@siemens.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/93d56386-6e37-060b-55ce-84de8cde535f@web.de Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
-rw-r--r--drivers/watchdog/watchdog_dev.c5
1 files changed, 4 insertions, 1 deletions
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);