path: root/kernel/irq
diff options
authorMarc Zyngier <marc.zyngier@arm.com>2016-09-19 09:49:27 +0100
committerThomas Gleixner <tglx@linutronix.de>2016-09-19 11:31:36 +0200
commit1984e075915cbae65336a99b1879865080d8e55e (patch)
tree7821bac4d017d04a8b6563493bb767af11b22f74 /kernel/irq
parent3be7988674ab33565700a37b210f502563d932e6 (diff)
genirq: Skip chained interrupt trigger setup if type is IRQ_TYPE_NONE
There is no point in trying to configure the trigger of a chained interrupt if no trigger information has been configured. At best this is ignored, and at the worse this confuses the underlying irqchip (which is likely not to handle such a thing), and unnecessarily alarms the user. Only apply the configuration if type is not IRQ_TYPE_NONE. Fixes: 1e12c4a9393b ("genirq: Correctly configure the trigger on chained interrupts") Reported-and-tested-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Link: https://lkml.kernel.org/r/CAMuHMdVW1eTn20=EtYcJ8hkVwohaSuH_yQXrY2MGBEvZ8fpFOg@mail.gmail.com Link: http://lkml.kernel.org/r/1474274967-15984-1-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/irq')
1 files changed, 6 insertions, 2 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 637389088b3f..26ba5654d9d5 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -820,6 +820,8 @@ __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
desc->name = name;
if (handle != handle_bad_irq && is_chained) {
+ unsigned int type = irqd_get_trigger_type(&desc->irq_data);
* We're about to start this interrupt immediately,
* hence the need to set the trigger configuration.
@@ -828,8 +830,10 @@ __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
* chained interrupt. Reset it immediately because we
* do know better.
- __irq_set_trigger(desc, irqd_get_trigger_type(&desc->irq_data));
- desc->handle_irq = handle;
+ if (type != IRQ_TYPE_NONE) {
+ __irq_set_trigger(desc, type);
+ desc->handle_irq = handle;
+ }