diff options
| author | Ben Hutchings <ben@decadent.org.uk> | 2013-06-28 02:40:30 +0100 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-07-27 05:34:21 +0100 |
| commit | e0a59ed79b08eea4ce3d88ddf8ef781265301b90 (patch) | |
| tree | e31fe8a568daadc58e19caf79c1d20ac1300327a /kernel/irq | |
| parent | 200c26329de1e3f052cf30ea9cbf5f4023d5ad5e (diff) | |
genirq: Fix can_request_irq() for IRQs without an action
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@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>
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/manage.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 382a6bd9c5ea..52bdd58f7328 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -539,9 +539,9 @@ 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; |