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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 09:21:52 -0800
commitd88048a3d7b795e08def7519626496e1f2d3931b (patch)
tree590ee5a38cdca2a2067adbf3744049c805d2a912
parent7a2d10ca36b5f50f5c34604c2c3c8bf371cb884f (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 0d809ae02d60..b38baff61c04 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -221,6 +221,7 @@ 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);