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authorThomas Gleixner <tglx@linutronix.de>2009-08-15 13:20:42 +0200
committerThomas Gleixner <tglx@linutronix.de>2009-08-15 13:20:42 +0200
commit6ea41d252f35465a2308a4038a323b6b07de06f6 (patch)
tree50315e593c1eacd4c0ebbe5abb1919bdb0302943 /kernel/time
parent23970e389e9cee43c4b41023935e1417271708b2 (diff)
clocksource: Call clocksource_change_rating() outside of watchdog_lock
The changes to the watchdog logic introduced a lock inversion between watchdog_lock and clocksource_mutex. Change the rating outside of watchdog_lock to avoid it. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/clocksource.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index a1657b5fdeb9..02dc22d888fe 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -307,16 +307,23 @@ static void clocksource_watchdog_work(struct work_struct *work)
{
struct clocksource *cs, *tmp;
unsigned long flags;
+ LIST_HEAD(unstable);
spin_lock_irqsave(&watchdog_lock, flags);
list_for_each_entry_safe(cs, tmp, &watchdog_list, wd_list)
if (cs->flags & CLOCK_SOURCE_UNSTABLE) {
list_del_init(&cs->wd_list);
- clocksource_change_rating(cs, 0);
+ list_add(&cs->wd_list, &unstable);
}
/* Check if the watchdog timer needs to be stopped. */
clocksource_stop_watchdog();
- spin_unlock(&watchdog_lock);
+ spin_unlock_irqrestore(&watchdog_lock, flags);
+
+ /* Needs to be done outside of watchdog lock */
+ list_for_each_entry_safe(cs, tmp, &unstable, wd_list) {
+ list_del_init(&cs->wd_list);
+ clocksource_change_rating(cs, 0);
+ }
}
#else /* CONFIG_CLOCKSOURCE_WATCHDOG */