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Subject[GIT pull] genirq fixes for 2.6.31
Linus,

Please pull the latest irq-fixes-for-linus git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git irq-fixes-for-linus

Thanks,

tglx

------------------>
Thomas Gleixner (1):
genirq: Prevent race between free_irq() and handle_IRQ_event()


kernel/irq/handle.c | 10 +++++++++-
1 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 065205b..4e7f17a 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -403,8 +403,16 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
*/
if (likely(!test_bit(IRQTF_DIED,
&action->thread_flags))) {
+ struct task_struct *tsk = action->thread;
+
set_bit(IRQTF_RUNTHREAD, &action->thread_flags);
- wake_up_process(action->thread);
+ /*
+ * Check tsk as we might race against
+ * free_irq which sets action->thread
+ * to NULL
+ */
+ if (tsk)
+ wake_up_process(tsk);
}

/* Fall through to add to randomness */

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