In case you boot with the watchdog disabled, i.e., nowatchdog, then,
if you try to disable it via /proc/sys/kernel/watchdog, you get
a kernel crash. The reason is that you are trying to cancel a hrtimer
which has never been initialized.
This patch fixes this by skipping execution of
watchdog_disable_all_cpus() when the watchdog is marked
disabled from boot.
Signed-off-by: Stephane Eranian <eran...@google.com>
--
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 69a3d44..f335067 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -473,6 +473,9 @@ static void watchdog_disable_all_cpus(void)
{
int cpu;
+ if (no_watchdog)
+ return;
+
for_each_online_cpu(cpu)
watchdog_disable(cpu);
------------------------------------------------------------------------------
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