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genirq: No need to check IRQTF_DIED before stopping a thread handler 

Since 63706172f3 kthread_stop() is not
afraid of dead kernel threads. So no need to check if a thread is
alive before stopping it. These checks still were racy.

Reported-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Link: http://lkml.kernel.org/r/20120309135939.GC2114@dhcp-26-207.brq.redhat.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Alexander Gordeev 2012-03-09 14:59:40 +01:00 committed by Thomas Gleixner
parent 4bcdf1d0b6
commit 05d74efa3c
1 changed files with 2 additions and 4 deletions
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6
kernel/irq/manage.c
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@ -1106,8 +1106,7 @@ out_thread:
struct task_struct *t = new->thread;
new->thread = NULL;
if (likely(!test_bit(IRQTF_DIED, &new->thread_flags)))
kthread_stop(t);
kthread_stop(t);
put_task_struct(t);
}
out_mput:
@ -1217,8 +1216,7 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
#endif
if (action->thread) {
if (!test_bit(IRQTF_DIED, &action->thread_flags))
kthread_stop(action->thread);
kthread_stop(action->thread);
put_task_struct(action->thread);
}