[PATCH] kill mutex in lis

[Andy Green]

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Sean McNeil wrote:
> I'd like to also remind again that the 2 accelerometers are mutually
> exclusive so they will have to block each other with a mutex or spin
> lock. This brings up a question I have about the original changes: why
> convert the mutex to a spin lock? What is the benefit? Is it because
> there is an acquire in an ISR?

Holger's patch is not to the point in this case I think we find.  It's
the SPI APIs that have trouble operating during interrupts off, not us.

- -Andy
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