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authorAlexander Gordeev <agordeev@redhat.com>2012-03-09 17:59:40 +0400
committerThomas Gleixner <tglx@linutronix.de>2012-03-09 20:19:08 +0400
commit05d74efa3c72a5c40b0edeb15856c0230126313b (patch)
treecac8c177adbf67f3b9234341da2516fff51a50ff /kernel/irq/manage.c
parent4bcdf1d0b652bc33d52f2322b77463e4dc58abf8 (diff)
downloadlinux-05d74efa3c72a5c40b0edeb15856c0230126313b.tar.xz
genirq: No need to check IRQTF_DIED before stopping a thread handler
Since 63706172f332fd3f6e7458ebfb35fa6de9c21dc5 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>
Diffstat (limited to 'kernel/irq/manage.c')
-rw-r--r--kernel/irq/manage.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 0fa3ce998ecb..3feab4ab6877 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -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);
}