Thomas Gleixner
3c8bb90efb
rtc: Fix hrtimer deadlock ...
Ben reported a lockup related to rtc. The lockup happens due to:
CPU0 CPU1
rtc_irq_set_state() __run_hrtimer()
spin_lock_irqsave(&rtc->irq_task_lock) rtc_handle_legacy_irq();
spin_lock(&rtc->irq_task_lock);
hrtimer_cancel()
while (callback_running);
So the running callback never finishes as it's blocked on
rtc->irq_task_lock.
Use hrtimer_try_to_cancel() instead and drop rtc->irq_task_lock while
waiting for the callback. Fix this for both rtc_irq_set_state() and
rtc_irq_set_freq().
Cc: stable@kernel.org
Reported-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
2011-07-26 14:49:59 -07:00
2011-04-26 14:01:41 -07:00
2010-03-12 15:52:28 -08:00
2011-07-26 14:49:59 -07:00
2011-07-01 18:09:44 -07:00
2011-06-09 16:15:24 +08:00
2011-05-26 19:45:34 +02:00
2010-09-22 17:22:39 -07:00
2010-10-29 00:29:19 +02:00
2011-02-03 13:02:35 -08:00
2011-03-31 11:26:23 -03:00
2011-03-09 11:24:54 -08:00
2009-02-11 14:25:36 -08:00
2011-04-13 01:54:09 +02:00
2009-12-16 07:20:00 -08:00
2010-03-30 22:02:32 +09:00
2011-03-15 20:01:36 -07:00
2011-04-20 18:46:56 +02:00
2007-05-08 11:15:18 -07:00
2011-05-06 17:41:06 -07:00
2011-06-01 19:29:39 -07:00
2009-02-05 12:56:46 -08:00
2010-03-30 22:02:32 +09:00
2011-05-06 17:42:47 -07:00
2010-10-29 19:06:53 +09:00
2011-02-03 13:02:35 -08:00
2011-06-27 18:00:12 -07:00
2011-03-22 17:44:16 -07:00
2011-03-17 10:32:47 -06:00
2011-03-22 17:44:16 -07:00
2011-03-09 11:23:37 -08:00
2009-01-06 15:59:25 -08:00
2010-05-21 09:37:31 -07:00
2011-03-09 11:23:37 -08:00
2011-03-17 10:32:47 -06:00
2009-04-01 08:59:24 -07:00
2011-05-26 17:12:33 -07:00
2011-05-06 17:42:04 -07:00
2010-08-11 08:59:07 -07:00
2009-04-02 01:05:31 +00:00
2010-08-11 08:59:07 -07:00
2011-03-22 17:44:16 -07:00
2010-08-11 08:59:08 -07:00
2011-03-09 11:23:37 -08:00
2010-12-10 22:24:24 -08:00
2011-03-31 11:26:23 -03:00
2011-05-06 18:01:02 -07:00
2011-06-08 14:33:48 -06:00
2011-03-17 10:32:47 -06:00
2010-03-30 22:02:32 +09:00
2011-02-03 13:02:35 -08:00
2010-08-11 08:59:07 -07:00
2010-08-11 08:59:07 -07:00
2011-01-13 08:03:12 -08:00
2011-05-06 18:02:00 -07:00
2011-05-06 18:02:02 -07:00
2011-05-06 18:02:07 -07:00
2011-03-16 17:28:10 -07:00
2011-05-26 17:12:33 -07:00
2011-05-06 18:02:03 -07:00
2011-02-03 13:02:35 -08:00
2011-05-26 17:12:33 -07:00
2011-03-09 11:23:37 -08:00
2011-04-18 10:39:38 +02:00
2011-05-06 18:02:04 -07:00
2010-03-30 22:02:32 +09:00
2010-08-11 08:59:06 -07:00
2009-12-16 07:19:58 -08:00
2011-05-26 17:12:33 -07:00
2011-03-17 18:48:35 -07:00
2011-03-17 18:48:35 -07:00
2011-03-09 11:25:04 -08:00
2009-04-02 01:05:32 +00:00
2011-06-09 16:15:24 +08:00
2011-03-09 11:23:37 -08:00
2009-09-23 07:39:43 -07:00
2011-05-06 18:02:05 -07:00
2010-10-27 15:30:32 +09:00
2010-03-30 22:02:32 +09:00
2011-03-09 11:24:54 -08:00
2011-05-26 17:12:33 -07:00
2011-03-09 11:23:34 -08:00
2010-07-27 14:32:06 -07:00
2011-05-11 18:50:44 -07:00
2010-06-03 11:33:58 +02:00
2011-03-09 11:25:08 -08:00
2011-03-29 14:48:19 +02:00
2011-05-26 17:12:33 -07:00
2008-11-21 01:24:38 -08:00
2010-05-21 09:37:31 -07:00
2011-07-01 18:09:57 -07:00
2008-11-14 16:37:54 -08:00
2010-03-12 15:52:28 -08:00
2011-03-22 17:44:16 -07:00
2011-03-09 11:25:07 -08:00
2011-05-17 14:44:36 -04:00
2011-03-09 11:23:37 -08:00
2010-05-21 09:37:31 -07:00
2010-03-30 22:02:32 +09:00
2011-03-09 11:23:35 -08:00
2011-07-01 17:59:36 -07:00
2011-03-09 11:23:37 -08:00
2011-03-09 11:23:37 -08:00
2011-03-31 11:26:23 -03:00
3c8bb90efb