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

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Date:	Fri, 4 Feb 2011 11:49:54 -0800
From:	Greg KH <greg@...ah.com>
To:	Robert Morell <rmorell@...dia.com>
Cc:	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>,
	Olof Johansson <olof@...om.net>,
	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 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?

confused,

greg k-h
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