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genirq: Don't allow per cpu interrupts to be suspended 

The power management functions related to interrupts do not know
(yet) about per-cpu interrupts and end up calling the wrong
low-level methods to enable/disable interrupts.

This leads to all kind of interesting issues (action taken on one
CPU only, updating a refcount which is not used otherwise...).

The workaround for the time being is simply to flag these interrupts
with IRQF_NO_SUSPEND. At least on ARM, these interrupts are actually
dealt with at the architecture level.

Reported-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1321446459-31409-1-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Marc Zyngier 2011-11-16 12:27:39 +00:00 committed by Thomas Gleixner
parent aa1b052a34
commit 2ed0e645f3
1 changed files with 1 additions and 1 deletions
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2
kernel/irq/manage.c
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@ -1596,7 +1596,7 @@ int request_percpu_irq(unsigned int irq, irq_handler_t handler,
return -ENOMEM; return -ENOMEM;
action->handler = handler; action->handler = handler;
action->flags = IRQF_PERCPU; action->flags = IRQF_PERCPU | IRQF_NO_SUSPEND;
action->name = devname; action->name = devname;
action->percpu_dev_id = dev_id; action->percpu_dev_id = dev_id;