linux-kernel - Re: USB transfer_buffer allocations on 64bit systems

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Date:	Wed, 14 Apr 2010 16:29:22 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Chris Wright <chrisw@...s-sol.org>
cc:	Daniel Mack <daniel@...aq.de>,
	David Woodhouse <dwmw2@...radead.org>,
	Greg KH <gregkh@...e.de>, USB list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	<iommu@...ts.linux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Pedro Ribeiro <pedrib@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: USB transfer_buffer allocations on 64bit systems

On Wed, 14 Apr 2010, Chris Wright wrote:

> So dma_map_single is the case that's failing, but you think the mask is
> correct?  What about the direction?

The mask and direction are unquestionably correct.  The mask is set up 
by pci_setup_device() and not changed thereafter.  Furthermore, the 
audio works okay until another device (a DVB tuner) is plugged in.  

Alan Stern

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