[PATCH] Debug shared irqs

Drivers registering IRQ handlers with SA_SHIRQ really ought to be able to
handle an interrupt happening before request_irq() returns.  They also
ought to be able to handle an interrupt happening during the start of their
call to free_irq().  Let's test that hypothesis....

[bunk@stusta.de: Kconfig fixes]
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Cc: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 33 insertions, 0 deletions

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 8b961adc3bd2..400b12a63649 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -357,6 +357,7 @@ 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)
@@ -396,6 +397,8 @@ 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;
 			kfree(action);
 			return;
 		}
@@ -403,6 +406,17 @@ 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
+		 */
+		handler(irq, dev_id);
+	}
+#endif
 }
 EXPORT_SYMBOL(free_irq);
 
@@ -475,6 +489,25 @@ int request_irq(unsigned int irq, irq_handler_t handler,
 
 	select_smp_affinity(irq);
 
+#ifdef CONFIG_DEBUG_SHIRQ
+	if (irqflags & IRQF_SHARED) {
+		/*
+		 * It's a shared IRQ -- the driver ought to be prepared for it
+		 * to happen immediately, so let's make sure....
+		 * We do this before actually registering it, to make sure that
+		 * a 'real' IRQ doesn't run in parallel with our fake
+		 */
+		if (irqflags & IRQF_DISABLED) {
+			unsigned long flags;
+
+			local_irq_save(flags);
+			handler(irq, dev_id);
+			local_irq_restore(flags);
+		} else
+			handler(irq, dev_id);
+	}
+#endif
+
 	retval = setup_irq(irq, action);
 	if (retval)
 		kfree(action);