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posix-timers: Use spin_lock_irq() in itimer_delete()

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itimer_delete() uses spin_lock_irqsave() to obtain a `flags' variable
which can then be passed to unlock_timer(). It uses already spin_lock
locking for the structure instead of lock_timer() because it has a timer
which can not be removed by others at this point. The cleanup is always
performed with enabled interrupts.

Use spin_lock_irq() / spin_unlock_irq() so the `flags' variable can be
removed.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190621143643.25649-3-bigeasy@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2019-06-21 16:36:43 +02:00 committed by Thomas Gleixner
parent 12063d4310
commit 7586addb99
1 changed files with 3 additions and 5 deletions
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8
kernel/time/posix-timers.c
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@ -980,18 +980,16 @@ SYSCALL_DEFINE1(timer_delete, timer_t, timer_id)
*/
static void itimer_delete(struct k_itimer *timer)
{
unsigned long flags;
retry_delete:
spin_lock_irqsave(&timer->it_lock, flags);
spin_lock_irq(&timer->it_lock);
if (timer_delete_hook(timer) == TIMER_RETRY) {
unlock_timer(timer, flags);
spin_unlock_irq(&timer->it_lock);
goto retry_delete;
}
list_del(&timer->list);
unlock_timer(timer, flags);
spin_unlock_irq(&timer->it_lock);
release_posix_timer(timer, IT_ID_SET);
}