linux-kernel - Re: [spi-devel-general] [patch 05/14] mfd: PCAP2 driver

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Message-Id: <200811230026.11126.david-b@pacbell.net>
Date:	Sun, 23 Nov 2008 00:26:10 -0800
From:	David Brownell <david-b@...bell.net>
To:	Daniel Ribeiro <drwyrm@...il.com>
Cc:	Stefan Schmidt <stefan@...enfreihafen.org>,
	spi-devel-general@...ts.sourceforge.net,
	Stefan Schmidt <stefan@...nmoko.org>, eric.y.miao@...il.com,
	linux-kernel@...r.kernel.org, sameo@...nedhand.com,
	linux-arm-kernel@...ts.arm.linux.org.uk
Subject: Re: [spi-devel-general] [patch 05/14] mfd: PCAP2 driver

On Saturday 22 November 2008, Daniel Ribeiro wrote:
> Can you be more descriptive on "address the DMA"? Im not familiar on
> what is the issue here.

You may not pass stack based buffers -- as you're now doing -- for
the spi_transfer buffers.  Documentation/DMA-mapping.txt is very
clear that such buffers are not DMA-safe, and the SPI kerneldoc is
just as clear that spi_transfer.{tx,rx}_buf memory must be DMA-safe.

- Dave

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