linux-kernel - Re: [PATCH] USB: EHCI: fix for leaking isochronous data

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Date:	Fri, 15 Mar 2013 10:30:37 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Soeren Moch <smoch@....de>
cc:	Arnd Bergmann <arnd@...db.de>,
	USB list <linux-usb@...r.kernel.org>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	<linux-mm@...ck.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] USB: EHCI: fix for leaking isochronous data

On Fri, 15 Mar 2013, Soeren Moch wrote:

> > The log shows a 1-1 match between allocations and deallocations, except
> > for three excess allocations about 45 lines before the end.  I have no
> > idea what's up with those.  They may be an artifact arising from where
> > you stopped copying the log data.
> >
> > There are as many as 400 iTDs being allocated before any are freed.
> > That seems like a lot.  Are they all for the same isochronous endpoint?
> > What's the endpoint's period?  How often are URBs submitted?
> 
> I use 2 dvb sticks, capturing digital TV. For each stick 5 URBs on a 
> single endpoint are used, I think. I'm not sure, which endpoint in which 
> alternateSetting is active. I attached the output of 'lsusb -v' for the 
> sticks.
> How can I track down the other information you need?

Use usbmon (see Documentation/usb/usbmon.txt).

Alan Stern

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