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| author | David Woodhouse <dwmw2@infradead.org> | 2015-10-28 16:14:31 +0900 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2015-10-30 10:13:26 +0100 |
| commit | d9e4ad5badf4ccbfddee208c898fb8fd0c8836b1 (patch) | |
| tree | d3e50f3afbdb57b8c3eb84d03188cd357c1bec14 | |
| parent | 3b93baf56dafa2d27e4fc227990dcd3ffeb10510 (diff) | |
| download | linux-d9e4ad5badf4ccbfddee208c898fb8fd0c8836b1.tar.gz linux-d9e4ad5badf4ccbfddee208c898fb8fd0c8836b1.tar.bz2 linux-d9e4ad5badf4ccbfddee208c898fb8fd0c8836b1.zip | |
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 <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>
| -rw-r--r-- | include/linux/irqreturn.h | 2 |
1 files changed, 1 insertions, 1 deletions
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 */ |