Re: [PATCH 1/3] wm97xx-core: Only schedule interrupt handler if not already scheduled

[Mark Brown]

On Tue, Apr 15, 2008 at 09:02:35AM -0400, Dmitry Torokhov wrote:
> On Tue, Apr 15, 2008 at 09:48:19AM +0100, Mark Brown wrote:

> > As well as not queuing the work it ensures that the calls to
> > irq_enable() are balanced which helps with implementing that operation.

> Hmm... another question then - what would fire up wm97xx_pen_interrupt()
> again, before wm97xx_pen_irq_worker had a chance to run, if the very
> first thing we do after getting interrupt is irq_enable(wm, 0)?

Normally nothing - in most systems the interrupt will not be shared
and/or the board irq_enable() operation will completely disable the IRQ
line.  The main use case would be if the interrupt is shared and the
board irq_enable() operation doesn't affect other sources, though boards
may also decide that they can do without disabling the interrupt.
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