linux-kernel - Re: [REGRESSION] "USB: use kfifo to buffer usb-generic serial writes" causes gobi

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Date:	Mon, 22 Feb 2010 10:28:36 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Anssi Hannula <anssi.hannula@....fi>
cc:	Oliver Neukum <oliver@...kum.org>,
	Matthew Garrett <mjg59@...f.ucam.org>, <dvomlehn@...co.com>,
	<gregkh@...e.de>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [REGRESSION] "USB: use kfifo to buffer usb-generic serial writes"
 causes gobi_loader to hang

On Mon, 22 Feb 2010, Anssi Hannula wrote:

> > > If I additionally insert a one-second delay before the fd is closed, I
> > > get this usbmon log:
> > > http://stuff.onse.fi/gobi2000/gobi-regression5.mon.log
> > > 
> > > The firmware upload is still unsuccessful.
> > 
> > If I use the option driver instead of qcserial, the firmware upload is
> > always successful (without any added delays needed). The usbmon log for
> > that case can be found here:
> > http://stuff.onse.fi/gobi2000/gobi-regression6.mon.log
> 
> I installed 2.6.31.12 to get a usbmon log with qcserial before the regression 
> as well (without delays, upload successful):
> http://stuff.onse.fi/gobi2000/gobi-regression7.mon.log

The major difference between the logs is in the way the data get
divided up into packets.  In both the successful logs, there are 
sequences of bulk-OUT packets with lengths like:

	44, 1, 15, 1, 13

where the unsuccessful transfer just has a single packet of length 74.  
Also, the successful transfers show a lot of bulk-IN traffic where the 
unsuccessful transfer doesn't have any.  I don't know if that is 
relevant, however.

No other differences stand out.

Alan Stern

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