This is a note to let you know that I've just added the patch titled
genirq: Fix can_request_irq() for IRQs without an action
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
genirq-fix-can_request_irq-for-irqs-without-an-action.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2779db8d37d4b542d9ca2575f5f178dbeaca6c86 Mon Sep 17 00:00:00 2001
From: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Date: Fri, 28 Jun 2013 02:40:30 +0100
Subject: genirq: Fix can_request_irq() for IRQs without an action
From: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
commit 2779db8d37d4b542d9ca2575f5f178dbeaca6c86 upstream.
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@xxxxxxxxx>
Tested-by: Bjarni Ingi Gislason <bjarniig@xxxxxxxxx> (against 3.2)
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: 709647@xxxxxxxxxxxxxxx
Link: http://bugs.debian.org/709647
Link: http://lkml.kernel.org/r/1372383630.23847.40.camel@xxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/irq/manage.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -546,9 +546,9 @@ int can_request_irq(unsigned int irq, un
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;
Patches currently in stable-queue which might be from ben@xxxxxxxxxxxxxxx are
queue-3.4/genirq-fix-can_request_irq-for-irqs-without-an-action.patch
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