From: "John W. Linville" <linville@tuxdriver.com>
To: Christian Lamparter <chunkeey@googlemail.com>
Cc: linux-wireless@vger.kernel.org
Subject: Re: [PATCH for-2.6.38] p54pci: update receive dma buffers before and after processing
Date: Thu, 10 Feb 2011 19:52:51 -0500 [thread overview]
Message-ID: <20110211005250.GF1553@tuxdriver.com> (raw)
In-Reply-To: <201102110148.43155.chunkeey@googlemail.com>
On Fri, Feb 11, 2011 at 01:48:42AM +0100, Christian Lamparter wrote:
> Documentation/DMA-API-HOWTO.txt states:
>
> "DMA transfers need to be synced properly in order for
> the cpu and device to see the most uptodate and correct
> copy of the DMA buffer."
>
> Cc: <stable@kernel.org>
> Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
> ---
> Embarrassingly, this bug is unique to p54 and has been around
> since 2.6.25. This tells us something interesting about our
> userbase.
Most likely it tells us that most people using p54 are using little
endian boxes with coherent DMA... :-)
John
--
John W. Linville Someday the world will need a hero, and you
linville@tuxdriver.com might be all we have. Be ready.
next prev parent reply other threads:[~2011-02-11 0:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-11 0:48 [PATCH for-2.6.38] p54pci: update receive dma buffers before and after processing Christian Lamparter
2011-02-11 0:52 ` John W. Linville [this message]
2011-02-11 1:37 ` Larry Finger
2011-02-11 12:05 ` Christian Lamparter
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