[PATCH 12/17] spi/qspi: convert driver to enable/disable memory mapped.

[Mark Brown]

On Thu, Nov 28, 2013 at 04:38:27PM +0530, Sourav Poddar wrote:
> On Thursday 28 November 2013 04:19 PM, Mark Brown wrote:

> >Removing the mapping isn't going to stop another context which has
> >obtained a handle on the map trying to look at the mapping.

> hmm..so the  'memcpy' part should be made atomic.(if possible?).

Or holding the memory region should prevent normal SPI use (so any users
ought to drop the memory region when they don't need it).

I'm still a bit surprised there's no DMA controllers for this...
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