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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: 1e12c4a939 ("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>
This commit is contained in:
Marc Zyngier 2016-09-19 09:49:27 +01:00 committed by Thomas Gleixner
parent 3be7988674
commit 1984e07591
1 changed files with 6 additions and 2 deletions
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8
kernel/irq/chip.c
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@ -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;
}
irq_settings_set_noprobe(desc);
irq_settings_set_norequest(desc);