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

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Message-Id: <201002230355.04422.anssi.hannula@iki.fi>
Date:	Tue, 23 Feb 2010 03:55:04 +0200
From:	Anssi Hannula <anssi.hannula@....fi>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	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 tiistai 23 helmikuu 2010 01:26:02 Oliver Neukum wrote:
> Am Montag, 22. Februar 2010 19:35:35 schrieb Anssi Hannula:
> > On maanantai 22 helmikuu 2010 17:28:36 Alan Stern wrote:
> > > 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.
> > 
> > I guess that would suggest that the device doesn't allow the
> > initialization data to be broken into packets arbitrarily (though some
> > differences seem allowed, as the windows driver transmits them
> > differently).
> 
> Hi,
> 
> let's try testing this hypothesis. Can you change the following line in
> usb_serial_probe():
> 		if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))
> 			goto probe_error;
> 
> to:
> 
> 		if (kfifo_alloc(&port->write_fifo, 64, GFP_KERNEL))
> 			goto probe_error;
> 
> This may shed some light on the behavior.

No effect.

However, I added more sleep(1) calls to gobi_loader, now between every magicX 
string and firmware files (therefore ensuring the data gets flushed to the 
device at those points). Now the upload was successful.

-- 
Anssi Hannula
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