[PATCH 5/5] spi: sirf: fix spi full-duplex DMA transferring issue

[Mark Brown]

On Mon, Apr 14, 2014 at 02:30:01PM +0800, Barry Song wrote:
> From: Qipan Li <Qipan.Li at csr.com>
> 
> sometimes t->tx can be equal with t->rx. for example, spidev will make
> tx and rx point to spidev->buffer at the same time. currently, for this
> case, we map the buffer BIDIRECTION to fix the cache consistency.

I've applied this but such usage is out of spec - do we have any drivers
doing this in mainline?
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