From 69592db298e400a7c175c4dfbe7a086c783f349d Mon Sep 17 00:00:00 2001 From: Alexander Gordeev Date: Wed, 21 Mar 2012 17:22:13 +0100 Subject: [PATCH] genirq: Minor readablity improvement in irq_wake_thread() exit_irq_thread() clears IRQTF_RUNTHREAD flag and drops the thread's bit in desc->threads_oneshot then. The bit must not be set again in between and it does not, since irq_wake_thread() sees PF_EXITING flag first and returns. Due to above the order or checking PF_EXITING and IRQTF_RUNTHREAD flags in irq_wake_thread() is important. This change just makes it more visible in the source code. Signed-off-by: Alexander Gordeev Link: http://lkml.kernel.org/r/20120321162212.GO24806@dhcp-26-207.brq.redhat.com Signed-off-by: Thomas Gleixner --- kernel/irq/handle.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c index 6ff84e6a954c..bdb180325551 100644 --- a/kernel/irq/handle.c +++ b/kernel/irq/handle.c @@ -54,14 +54,18 @@ static void warn_no_thread(unsigned int irq, struct irqaction *action) static void irq_wake_thread(struct irq_desc *desc, struct irqaction *action) { /* - * Wake up the handler thread for this action. In case the - * thread crashed and was killed we just pretend that we - * handled the interrupt. The hardirq handler has disabled the - * device interrupt, so no irq storm is lurking. If the + * In case the thread crashed and was killed we just pretend that + * we handled the interrupt. The hardirq handler has disabled the + * device interrupt, so no irq storm is lurking. + */ + if (action->thread->flags & PF_EXITING) + return; + + /* + * Wake up the handler thread for this action. If the * RUNTHREAD bit is already set, nothing to do. */ - if ((action->thread->flags & PF_EXITING) || - test_and_set_bit(IRQTF_RUNTHREAD, &action->thread_flags)) + if (test_and_set_bit(IRQTF_RUNTHREAD, &action->thread_flags)) return; /*