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| author | Alexander Gordeev <agordeev@redhat.com> | 2012-03-21 17:22:13 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2012-03-29 11:31:52 +0200 |
| commit | 69592db298e400a7c175c4dfbe7a086c783f349d (patch) | |
| tree | cd6b3b24af6996612331ebf8cd9fb749c2d19f24 /kernel/irq | |
| parent | b5174fa3a7f4f8f150bfa3b917c92608953dfa0f (diff) | |
| download | linux-stable-69592db298e400a7c175c4dfbe7a086c783f349d.tar.gz linux-stable-69592db298e400a7c175c4dfbe7a086c783f349d.tar.bz2 linux-stable-69592db298e400a7c175c4dfbe7a086c783f349d.zip | |
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 <agordeev@redhat.com>
Link: http://lkml.kernel.org/r/20120321162212.GO24806@dhcp-26-207.brq.redhat.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/handle.c | 16 |
1 files 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; /* |