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>
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 7230d91..80eab7a0 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -405,7 +405,6 @@
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 @@
/* 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 @@
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);
