linux-kernel - [PATCH] kernel/irq: Reset IRQ desc->depth to 1 when __free

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Message-ID: <4b4c27f2.0506d00a.3dcb.2f78@mx.google.com>
Date:	Tue, 12 Jan 2010 09:41:47 +0200
From:	Shmulik Ladkani <shmulik.ladkani@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, tglx@...utronix.de, damm@...l.co.jp,
	peterz@...radead.org, ddaney@...iumnetworks.com
Subject: [PATCH] kernel/irq: Reset IRQ desc->depth to 1 when __free_irq
 disables the line

Reset irq_desc's depth field to 1, indicating IRQ line is disabled, when
__free_irq disables/shuts-down the line (i.e. upon unregistration of
last interrupt handler).

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@...il.com>
---
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index eb6078c..642a98c 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -877,6 +877,7 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
 
 	/* If this was the last handler, shut down the IRQ line: */
 	if (!desc->action) {
+		desc->depth = 1;
 		desc->status |= IRQ_DISABLED;
 		if (desc->chip->shutdown)
 			desc->chip->shutdown(irq);
-- 
Shmulik Ladkani
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