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xtensa: clear timer IRQ unconditionally in its handler

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PIC irq_ack doesn't clear timer IRQ, because timer interrupt handler
usually set up new timer by writing to ccompare register and thus
clearing timer IRQ. However timer may not be set up in the IRQ handler,
e.g. with tickless idle on SMP, or when CPU is going offline, leaving
timer IRQ raised and making do_interrupt attempting to handle it
forever.

To fix this always write current value of ccompare SR chosen to be linux
timer back to that SR on entry to timer interrupt handler.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
This commit is contained in:
Max Filippov 2013-10-17 02:42:24 +04:00 committed by Chris Zankel
parent 996232393b
commit bae07f8a9d
1 changed files with 1 additions and 0 deletions
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arch/xtensa/kernel/time.c
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@ -158,6 +158,7 @@ irqreturn_t timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *evt = &this_cpu_ptr(&ccount_timer)->evt;
set_linux_timer(get_linux_timer());
evt->event_handler(evt);
/* Allow platform to do something useful (Wdog). */