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authorDavid Woodhouse <dwmw2@infradead.org>2007-10-16 23:26:29 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 08:42:49 -0700
commit1d99493b3a68e40e56459ea3565d4402fb6e5f3a (patch)
tree362ebcf8871e0fad07aa754bb5194de3a2cd64d3
parentf13ef7754f724842dbf5ae6d85d0604fff0d1a84 (diff)
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>
-rw-r--r--kernel/irq/manage.c31
1 files changed, 15 insertions, 16 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 7230d914eaa..80eab7a0420 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);