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genirq: Fix can_request_irq() for IRQs without an action 

commit 2779db8d37d4b542d9ca2575f5f178dbeaca6c86 upstream.

Commit 02725e7471 ('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@rhi.hi.is>
Tested-by: Bjarni Ingi Gislason <bjarniig@rhi.hi.is> (against 3.2)
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: 709647@bugs.debian.org
Link: http://bugs.debian.org/709647
Link: http://lkml.kernel.org/r/1372383630.23847.40.camel@deadeye.wl.decadent.org.uk
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ben Hutchings 2013-06-28 02:40:30 +01:00 committed by Greg Kroah-Hartman
parent 9ceb896c67
commit 3dc8601b54
1 changed files with 3 additions and 3 deletions
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6
kernel/irq/manage.c
View File

@ -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;