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

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Message-ID: <Pine.LNX.4.44L0.1004141422181.1716-100000@iolanthe.rowland.org>
Date:	Wed, 14 Apr 2010 14:23:40 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Pedro Ribeiro <pedrib@...il.com>
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 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

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