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alarmtimer: Lock k_itimer during timer callback 

commit 474e941bed9262f5fa2394f9a4a67e24499e5926 upstream.

Locks the k_itimer's it_lock member when handling the alarm timer's
expiry callback.

The regular posix timers defined in posix-timers.c have this lock held
during timout processing because their callbacks are routed through
posix_timer_fn().  The alarm timers follow a different path, so they
ought to grab the lock somewhere else.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Sharvil Nanavati <sharvil@google.com>
Signed-off-by: Richard Larocque <rlarocque@google.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Richard Larocque 2014-09-09 18:31:05 -07:00 committed by Zefan Li
parent b114657d1e
commit e06503426e
1 changed files with 8 additions and 2 deletions
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10
kernel/time/alarmtimer.c
View File

@ -454,8 +454,12 @@ static enum alarmtimer_type clock2alarm(clockid_t clockid)
static enum alarmtimer_restart alarm_handle_timer(struct alarm *alarm,
ktime_t now)
{
unsigned long flags;
struct k_itimer *ptr = container_of(alarm, struct k_itimer,
it.alarm.alarmtimer);
enum alarmtimer_restart result = ALARMTIMER_NORESTART;
spin_lock_irqsave(&ptr->it_lock, flags);
if ((ptr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) {
if (posix_timer_event(ptr, 0) != 0)
ptr->it_overrun++;
@ -465,9 +469,11 @@ static enum alarmtimer_restart alarm_handle_timer(struct alarm *alarm,
if (ptr->it.alarm.interval.tv64) {
ptr->it_overrun += alarm_forward(alarm, now,
ptr->it.alarm.interval);
return ALARMTIMER_RESTART;
result = ALARMTIMER_RESTART;
}
return ALARMTIMER_NORESTART;
spin_unlock_irqrestore(&ptr->it_lock, flags);
return result;
}
/**