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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>
This commit is contained in:
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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2
include/linux/irqreturn.h
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@ -3,7 +3,7 @@
/**
* enum irqreturn
* @IRQ_NONE interrupt was not from this device
* @IRQ_NONE interrupt was not from this device or was not handled
* @IRQ_HANDLED interrupt was handled by this device
* @IRQ_WAKE_THREAD handler requests to wake the handler thread
*/