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

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Date:	Wed, 14 Apr 2010 19:27:42 +0100
From:	Pedro Ribeiro <pedrib@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Daniel Mack <daniel@...aq.de>,
	USB list <linux-usb@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <gregkh@...e.de>
Subject: Re: USB transfer_buffer allocations on 64bit systems

On 14 April 2010 19:23, Alan Stern <stern@...land.harvard.edu> wrote:
> On Wed, 14 Apr 2010, Pedro Ribeiro wrote:
>
>> The best way to trigger the issue is to connect a dib0700 based DVB
>> adapter. All you need is to connect it. Since it polls for the remote
>> control every 50 msec, it causes a constant interference. Beware that
>> on 2.6.34 this behaviour has been corrected. Other DVB adapters may
>> trigger the same issue if they also poll constatly for the rc.
>
> Your computer has two EHCI controllers, doesn't it?  Can you plug the
> DVB into a different USB bus from the audio device?  If you do, does
> the interference still occur?
>
> Alan Stern
>
>

It does not matter on which ports I plug into, even if in different
buses not sharing IRQ's.

Pedro
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