[PATCH] kill mutex in lis

[Andy Green]

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Simon Kagstrom wrote:

> I think this might disable interrupts for too long - reg_read ends up
> in scheduling stuff on a workqueue and waiting for that to be run. In
> computer terms it could take ages.

Workqueue function is based on scheduler / interrupt itself, it won't
happen in a context where interrupts are disabled.

- -Andy
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