[PATCH] kill mutex in lis

[Andy Green]

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Werner Almesberger wrote:
> Andy Green wrote:
>> Workqueue function is based on scheduler / interrupt itself, it won't
>> happen in a context where interrupts are disabled.
> 
> You still have a wait_for_completion in spi_sync, so that
> approach doesn't work :-(
> 
> How bad was the workqueue really ? It's certainly wasteful,
> but if we consider that all the data goes up to userspace
> eagerly consuming every event anyway, it may not matter all
> that much in the big picture.

Shouldn't we be asking if we can batch input events in kernel and dump
them at less than 2 x 100Hz to reduce load at userspace, rather than how
can we conform to whatever upstream has (SPI API that insists on
interrupts) and never think outside that box?

- -Andy
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