linux-kernel - Re: [PATCH] spi: pl022: Fix broken spidev when DMA is enabled

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Message-ID: <20141008182123.GH4609@sirena.org.uk>
Date:	Wed, 8 Oct 2014 19:21:23 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Ray Jui <rjui@...adcom.com>
Cc:	Grant Likely <grant.likely@...aro.org>, linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org, JD Zheng <jdzheng@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>
Subject: Re: [PATCH] spi: pl022: Fix broken spidev when DMA is enabled

On Wed, Oct 08, 2014 at 09:14:35AM -0700, Ray Jui wrote:

> Thanks for the reply. It looks like you are also the maintainer of spidev.
> In this case, could you please help to confirm that you expect spidev to use
> separate buffers for TX and RX? If so, I can go ahead and make the change in
> spidev.

Yes, that would be my expectation for maximum robustness (or if it is
going to use one buffer it explicitly maps it for mixed use but I'd
expect that to be asking for trouble).

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