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

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Message-ID: <y2z74fd948d1004141412z1bb8424ekae627356bd8cc408@mail.gmail.com>
Date:	Wed, 14 Apr 2010 22:12:48 +0100
From:	Pedro Ribeiro <pedrib@...il.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Chris Wright <chrisw@...s-sol.org>,
	USB list <linux-usb@...r.kernel.org>, Greg KH <gregkh@...e.de>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	iommu@...ts.linux-foundation.org, Andi Kleen <andi@...stfloor.org>,
	Daniel Mack <daniel@...aq.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: USB transfer_buffer allocations on 64bit systems

On 14 April 2010 22:01, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
> On Wed, Apr 14, 2010 at 04:29:22PM -0400, Alan Stern wrote:
>> 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.
>
> Could the driver for the DVB tuner change the PCI mask? That is, change
> the pci mask way after it has been initialized (don't laugh, this did
> happend - as I remember 4 months fix was posted on the DRM mailing list
> for this).
>

I can also trigger the bug on mount and unmount of a USB stick, albeit
its not as intensive.

Pedro
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