genirq: Fix race condition when stopping the irq thread

In irq_wait_for_interrupt(), the should_stop member is verified before
setting the task's state to TASK_INTERRUPTIBLE and calling schedule().
In case kthread_stop sets should_stop and wakes up the process after
should_stop is checked by the irq thread but before the task's state
is changed, the irq thread might never exit:

kthread_stop                    irq_wait_for_interrupt
------------                    ----------------------

                                 ...
...                              while (!kthread_should_stop()) {
kthread->should_stop = 1;
wake_up_process(k);
wait_for_completion(&kthread->exited);
...
                                     set_current_state(TASK_INTERRUPTIBLE);

                                     ...

                                     schedule();
                                 }

Fix this by checking if the thread should stop after modifying the
task's state.

[ tglx: Simplified it a bit ]

Signed-off-by: Ido Yariv <ido@wizery.com>
Link: http://lkml.kernel.org/r/1322740508-22640-1-git-send-email-ido@wizery.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@kernel.org

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 0e2b179bc7b371ea8aa60f52899ae60ff1cb5ec2..1da999f5e746caedacb8b40d0015e7c3f273ad04 100644 (file)
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -623,8 +623,9 @@ static irqreturn_t irq_nested_primary_handler(int irq, void *dev_id)
 
 static int irq_wait_for_interrupt(struct irqaction *action)
 {
+       set_current_state(TASK_INTERRUPTIBLE);
+
        while (!kthread_should_stop()) {
-               set_current_state(TASK_INTERRUPTIBLE);
 
                if (test_and_clear_bit(IRQTF_RUNTHREAD,
                                       &action->thread_flags)) {
@@ -632,7 +633,9 @@ static int irq_wait_for_interrupt(struct irqaction *action)
                        return 0;
                }
                schedule();
+               set_current_state(TASK_INTERRUPTIBLE);
        }
+       __set_current_state(TASK_RUNNING);
        return -1;
 }