watchdog: Only disable/enable watchdog if neccessary

Don't take any action on an unsuccessful write to /proc.
Signed-off-by: NMandeep Singh Baines <msb@chromium.org>
Cc: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/1306127423-3347-2-git-send-email-msb@chromium.orgSigned-off-by: NIngo Molnar <mingo@elte.hu>

kernel/watchdog.c

@@ -507,15 +507,19 @@ static void watchdog_disable_all_cpus(void)
 int proc_dowatchdog_enabled(struct ctl_table *table, int write,
 		     void __user *buffer, size_t *length, loff_t *ppos)
 {
-	proc_dointvec(table, write, buffer, length, ppos);
+	int ret;
+
+	ret = proc_dointvec(table, write, buffer, length, ppos);
+	if (ret || !write)
+		goto out;
 
-	if (write) {
 	if (watchdog_enabled)
 		watchdog_enable_all_cpus();
 	else
 		watchdog_disable_all_cpus();
-	}
-	return 0;
+
+out:
+	return ret;
 }
 
 int proc_dowatchdog_thresh(struct ctl_table *table, int write,