On 05/10/13 03:21, Andreas Fenkart wrote:
> comment based on changelog of d209a699a0b975ad
>
> Signed-off-by: Andreas Fenkart <andreas.fenk...@streamunlimited.com>
> ---
> kernel/irq/chip.c | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
> index cbd97ce..4e3c439 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 - mask interupt disabled
- mark interrupt 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);
>
--
~Randy
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