diff options
| author | David Woodhouse <dwmw2@infradead.org> | 2007-10-16 23:26:29 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 08:42:49 -0700 |
| commit | 1d99493b3a68e40e56459ea3565d4402fb6e5f3a (patch) | |
| tree | 362ebcf8871e0fad07aa754bb5194de3a2cd64d3 /kernel/irq | |
| parent | f13ef7754f724842dbf5ae6d85d0604fff0d1a84 (diff) | |
| download | linux-1d99493b3a68e40e56459ea3565d4402fb6e5f3a.tar.gz linux-1d99493b3a68e40e56459ea3565d4402fb6e5f3a.tar.bz2 linux-1d99493b3a68e40e56459ea3565d4402fb6e5f3a.zip | |
Fix CONFIG_DEBUG_SHIRQ trigger on free_irq()
Andy Gospodarek pointed out that because we return in the middle of the
free_irq() function, we never actually do call the IRQ handler that just
got deregistered. This should fix it, although I expect Andrew will want
to convert those 'return's to 'break'. That's a separate change though.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Cc: Andy Gospodarek <andy@greyhouse.net>
Cc: Fernando Luis Vzquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/manage.c | 31 |
1 files changed, 15 insertions, 16 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 7230d914eaa2..80eab7a04205 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -405,7 +405,6 @@ void free_irq(unsigned int irq, void *dev_id) struct irq_desc *desc; struct irqaction **p; unsigned long flags; - irqreturn_t (*handler)(int, void *) = NULL; WARN_ON(in_interrupt()); if (irq >= NR_IRQS) @@ -445,8 +444,21 @@ void free_irq(unsigned int irq, void *dev_id) /* Make sure it's not being used on another CPU */ synchronize_irq(irq); - if (action->flags & IRQF_SHARED) - handler = action->handler; +#ifdef CONFIG_DEBUG_SHIRQ + /* + * It's a shared IRQ -- the driver ought to be + * prepared for it to happen even now it's + * being freed, so let's make sure.... We do + * this after actually deregistering it, to + * make sure that a 'real' IRQ doesn't run in + * parallel with our fake + */ + if (action->flags & IRQF_SHARED) { + local_irq_save(flags); + action->handler(irq, dev_id); + local_irq_restore(flags); + } +#endif kfree(action); return; } @@ -454,19 +466,6 @@ void free_irq(unsigned int irq, void *dev_id) spin_unlock_irqrestore(&desc->lock, flags); return; } -#ifdef CONFIG_DEBUG_SHIRQ - if (handler) { - /* - * It's a shared IRQ -- the driver ought to be prepared for it - * to happen even now it's being freed, so let's make sure.... - * We do this after actually deregistering it, to make sure that - * a 'real' IRQ doesn't run in parallel with our fake - */ - local_irq_save(flags); - handler(irq, dev_id); - local_irq_restore(flags); - } -#endif } EXPORT_SYMBOL(free_irq); |