spi: race in spi_finalize_current_message starting queue_kthread_work before the message is unmapped

[Mark Brown]

On Fri, May 08, 2015 at 10:02:44PM +0200, Martin Sperl wrote:

> Based on the findings by Noralf, the following solves the issue:

Can you please post this upstream as a proper submission so I can review
and apply it (I'm not going to look at it properly right now, it's just
gone 11pm, but at first glance it doesn't ring any alarm bells)?

> Note that I am not sure about the locking, so I left unmap outside the
> lock for now.

It needs to be, you can't do anything big like unmapping in a
non-sleeping context.
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