linux-kernel - [PATCH] genirq: Fix can_request_irq() for IRQs without an action

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Date:	Fri, 28 Jun 2013 02:40:30 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Bjarni Ingi Gislason <bjarniig@....hi.is>, stable@...r.kernel.org,
	709647@...s.debian.org, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] genirq: Fix can_request_irq() for IRQs without an action

Commit 02725e7471b8 ('genirq: Use irq_get/put functions'),
inadvertently changed can_request_irq() to return 0 for IRQs that have
no action.  This causes pcibios_lookup_irq() to select only IRQs that
already have an action with IRQF_SHARED set, or to fail if there are
none.  Change can_request_irq() to return 1 for IRQs that have no
action (if the first two conditions are met).

Reported-by: Bjarni Ingi Gislason <bjarniig@....hi.is>
References: http://bugs.debian.org/709647
Tested-by: Bjarni Ingi Gislason <bjarniig@....hi.is> (against 3.2)
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Cc: stable@...r.kernel.org # 2.6.39+
Cc: 709647@...s.debian.org
---
 kernel/irq/manage.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index fa17855..dc4db32 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -555,9 +555,9 @@ int can_request_irq(unsigned int irq, unsigned long irqflags)
 		return 0;
 
 	if (irq_settings_can_request(desc)) {
-		if (desc->action)
-			if (irqflags & desc->action->flags & IRQF_SHARED)
-				canrequest =1;
+		if (!desc->action ||
+		    irqflags & desc->action->flags & IRQF_SHARED)
+			canrequest = 1;
 	}
 	irq_put_desc_unlock(desc, flags);
 	return canrequest;


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