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authorThomas Gleixner <tglx@linutronix.de>2011-12-02 16:02:45 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2011-12-09 08:52:53 -0800
commitb01b383bbd04e9dcf7d9fe6ca3751b77ccdc533c (patch)
tree011972826f7b83c5aafece5ef589e93a4d011508
parent4078977c46f627f553ed2d8ea047b9bf25dee48d (diff)
clockevents: Set noop handler in clockevents_exchange_device()
commit de28f25e8244c7353abed8de0c7792f5f883588c upstream. If a device is shutdown, then there might be a pending interrupt, which will be processed after we reenable interrupts, which causes the original handler to be run. If the old handler is the (broadcast) periodic handler the shutdown state might hang the kernel completely. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--kernel/time/clockevents.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index e4c699dfa4e8..13dfaaba4061 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -286,6 +286,7 @@ void clockevents_exchange_device(struct clock_event_device *old,
* released list and do a notify add later.
*/
if (old) {
+ old->event_handler = clockevents_handle_noop;
clockevents_set_mode(old, CLOCK_EVT_MODE_UNUSED);
list_del(&old->list);
list_add(&old->list, &clockevents_released);