Document that IRQ_NONE should be returned when IRQ not actually handled

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Our IRQ storm detection works when an interrupt handler returns
IRQ_NONE for thousands of consecutive interrupts in a second. It
doesn't hurt to occasionally return IRQ_NONE when the interrupt is
actually genuine.

Drivers should only be returning IRQ_HANDLED if they have actually
*done* something to stop an interrupt from happening — it doesn't just
mean "this really *was* my device".

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: davem@davemloft.net
Link: http://lkml.kernel.org/r/1446016471.3405.201.camel@infradead.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

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David Woodhouse 2015-10-28 16:14:31 +09:00 • committed by Thomas Gleixner

parent 3b93baf56d

commit d9e4ad5bad

1 changed files with 1 additions and 1 deletions

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include/linux/irqreturn.h

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