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

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Message-ID: <20110204201616.GA12482@suse.de>
Date:	Fri, 4 Feb 2011 12:16:16 -0800
From:	Greg KH <gregkh@...e.de>
To:	Olof Johansson <olof@...om.net>
Cc:	Greg KH <greg@...ah.com>, Robert Morell <rmorell@...dia.com>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	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 04, 2011 at 12:14:54PM -0800, Olof Johansson wrote:
> 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.

Then why would someone send me a patch for it already?

Still confused,

greg k-h
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