linux-kernel - Re: [PATCH 2/3] USB: HCD: Add driver hooks for (un)?map_urb_for

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Message-ID: <Pine.LNX.4.44L0.1101271101310.2090-100000@iolanthe.rowland.org>
Date:	Thu, 27 Jan 2011 11:01:47 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Robert Morell <rmorell@...dia.com>
cc:	David Brownell <dbrownell@...rs.sourceforge.net>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Benoit Goby <benoit@...roid.com>,
	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 2/3] USB: HCD: Add driver hooks for (un)?map_urb_for_dma

On Wed, 26 Jan 2011, 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>

Acked-by: Alan Stern <stern@...land.harvard.edu>

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