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clockevents: Set noop handler in clockevents_exchange_device()

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commit de28f25e82 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>
This commit is contained in:
Thomas Gleixner
2011-12-02 16:02:45 +01:00
committed by Greg Kroah-Hartman
parent 5a643352d2
commit aeed6baa70
1 changed files with 1 additions and 0 deletions
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kernel/time/clockevents.c
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@@ -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);