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author | Andreas Fenkart <andreas.fenkart@streamunlimited.com> | 2013-05-10 10:21:30 (GMT) |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2013-05-29 09:09:10 (GMT) |
commit | d671a605580d2caafc77f1a25bcf8435795df6fe (patch) | |
tree | cad94ffca5b44af28fe51afcabd09cc87b0b0020 /kernel/irq/chip.c | |
parent | e8bd834f73714378ef110a64287db1b77033c8da (diff) | |
download | linux-d671a605580d2caafc77f1a25bcf8435795df6fe.tar.xz |
genirq: Add kerneldoc for irq_disable.
Document the lazy disable functionality. comment based on changelog of
d209a699a0b975ad
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>
Diffstat (limited to 'kernel/irq/chip.c')
-rw-r--r-- | kernel/irq/chip.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index cbd97ce..a3bb14f 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -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); |