linux-kernel - Re: [PATCH 1/2] USB: HCD: Add driver hooks for (un)?map_urb_for

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Message-ID: <20110123034653.GA20186@kroah.com>
Date:	Sat, 22 Jan 2011 19:46:53 -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 1/2] USB: HCD: Add driver hooks for (un)?map_urb_for_dma

On Thu, Jan 20, 2011 at 01:41:54PM -0800, Robert Morell wrote:
> Provide optional hooks for the host controller driver to override the
> default DMA mapping and unmapping routines.  In general, these shouldn't
> be necessary unless the host controller has special DMA requirements,
> such as alignment contraints.  If these are not specified, the
> general usb_hcd_(un)?map_urb_for_dma functions will be used instead.
> Also, pass the status to unmap_urb_for_dma so it can know whether the
> DMA buffer has been overwritten.
> 
> Finally, add a flag to be used by these implementations if they
> allocated a temporary buffer so it can be freed properly when unmapping.
> 
> Signed-off-by: Robert Morell <rmorell@...dia.com>

I'd like to get an ACK from Alan before applying this one, and ideally
also from David and Sarah as they know the HCD code also.

Anyone?

thanks,

greg k-h
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