Messages in this thread Patch in this message | | | Date | Thu, 13 Aug 2009 21:02:22 +0200 (CEST) | From | Thomas Gleixner <> | Subject | [GIT pull] genirq fixes for 2.6.31 |
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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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