From: David Woodhouse Date: Wed, 28 Oct 2015 07:14:31 +0000 (+0900) Subject: Document that IRQ_NONE should be returned when IRQ not actually handled X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=d9e4ad5badf4ccbfddee208c898fb8fd0c8836b1;p=deliverable%2Flinux.git Document that IRQ_NONE should be returned when IRQ not actually handled 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 Cc: davem@davemloft.net Link: http://lkml.kernel.org/r/1446016471.3405.201.camel@infradead.org Signed-off-by: Thomas Gleixner --- diff --git a/include/linux/irqreturn.h b/include/linux/irqreturn.h index e374e369fb2f..eb1bdcf95f2e 100644 --- a/include/linux/irqreturn.h +++ b/include/linux/irqreturn.h @@ -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 */