linux-kernel - Re: [PATCH 3/3] USB: ehci: tegra: Align DMA transfers to 32 bytes

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Message-ID: <AANLkTinRtch4Pvr3GLz5wZU2xkG3FMJxxzSNAdParA7j@mail.gmail.com>
Date:	Fri, 4 Feb 2011 12:14:54 -0800
From:	Olof Johansson <olof@...om.net>
To:	Greg KH <greg@...ah.com>
Cc:	Robert Morell <rmorell@...dia.com>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Benoit Goby <benoit@...roid.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Ming Lei <tom.leiming@...il.com>,
	Jacob Pan <jacob.jun.pan@...el.com>,
	Oliver Neukum <oliver@...kum.org>,
	Erik Gilling <konkers@...roid.com>,
	Colin Cross <ccross@...roid.com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH 3/3] USB: ehci: tegra: Align DMA transfers to 32 bytes

On Fri, Feb 4, 2011 at 11:49 AM, Greg KH <greg@...ah.com> wrote:
> On Wed, Jan 26, 2011 at 07:06:49PM -0800, Robert Morell wrote:
>> The Tegra2 USB controller doesn't properly deal with misaligned DMA
>> buffers, causing corruption.  This is especially prevalent with USB
>> network adapters, where skbuff alignment is often in the middle of a
>> 4-byte dword.
>>
>> To avoid this, allocate a temporary buffer for the DMA if the provided
>> buffer isn't sufficiently aligned.
>>
>> Signed-off-by: Robert Morell <rmorell@...dia.com>
>> ---
>>  drivers/usb/host/ehci-tegra.c |   90 +++++++++++++++++++++++++++++++++++++++++
>
> This file doesn't seem to be in any tree that I can find, including my
> own, so I can't apply this patch.
>
> What am I supposed to do with it?

It hasn't been posted for upstream yet, so nothing for you to do. The
driver will be posted for review soon, hopefully in time for .39.


-Olof
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