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genirq: Add kerneldoc for irq_disable. 

Document the lazy disable functionality. comment based on changelog of
d209a699a0

Signed-off-by: Andreas Fenkart <andreas.fenkart@streamunlimited.com>
Cc: balbi@ti.com
Link: http://lkml.kernel.org/r/1368181290-1583-1-git-send-email-andreas.fenkart@streamunlimited.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Andreas Fenkart 2013-05-10 12:21:30 +02:00 committed by Thomas Gleixner
parent e8bd834f73
commit d671a60558
1 changed files with 13 additions and 0 deletions
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13
kernel/irq/chip.c
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@ -213,6 +213,19 @@ void irq_enable(struct irq_desc *desc)
irq_state_clr_masked(desc);
}
/**
* irq_disable - Mark interupt disabled
* @desc: irq descriptor which should be disabled
*
* If the chip does not implement the irq_disable callback, we
* use a lazy disable approach. That means we mark the interrupt
* disabled, but leave the hardware unmasked. That's an
* optimization because we avoid the hardware access for the
* common case where no interrupt happens after we marked it
* disabled. If an interrupt happens, then the interrupt flow
* handler masks the line at the hardware level and marks it
* pending.
*/
void irq_disable(struct irq_desc *desc)
{
irq_state_set_disabled(desc);