Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

[platform/kernel/linux-rpi.git] / kernel / watchdog.c

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index d4b0fa0..63177be 100644 (file)
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -49,6 +49,8 @@ unsigned long *watchdog_cpumask_bits = cpumask_bits(&watchdog_cpumask);
 #define for_each_watchdog_cpu(cpu) \
        for_each_cpu_and((cpu), cpu_online_mask, &watchdog_cpumask)
 
+atomic_t watchdog_park_in_progress = ATOMIC_INIT(0);
+
 /*
  * The 'watchdog_running' variable is set to 1 when the watchdog threads
  * are registered/started and is set to 0 when the watchdog threads are
@@ -260,6 +262,9 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
        int duration;
        int softlockup_all_cpu_backtrace = sysctl_softlockup_all_cpu_backtrace;
 
+       if (atomic_read(&watchdog_park_in_progress) != 0)
+               return HRTIMER_NORESTART;
+
        /* kick the hardlockup detector */
        watchdog_interrupt_count();
 
@@ -467,12 +472,16 @@ static int watchdog_park_threads(void)
 {
        int cpu, ret = 0;
 
+       atomic_set(&watchdog_park_in_progress, 1);
+
        for_each_watchdog_cpu(cpu) {
                ret = kthread_park(per_cpu(softlockup_watchdog, cpu));
                if (ret)
                        break;
        }
 
+       atomic_set(&watchdog_park_in_progress, 0);
+
        return ret;
 }