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

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Date:	Mon, 22 Feb 2010 01:13:35 +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 maanantai 22 helmikuu 2010 01:06:36 Anssi Hannula wrote:
> On maanantai 22 helmikuu 2010 00:12:36 Oliver Neukum wrote:
> > Am Sonntag, 21. Februar 2010 22:42:12 schrieb Anssi Hannula:
> > > And of course this doesn't explain why it hangs (and the WARNING) if I
> > > remove the sleep calls I added in gobi_loader.
> > 
> > Please tell us where you put a delay.
> 
> As I said earlier, the delay was put *before* most of the data gets
> written.
> 
> More specifically, I inserted a delay of one second between transmission of
> magic1 and magic2, one between magic2 and magic3, and one between magic3
> and the first firmware file.
> 
> 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

-- 
Anssi Hannula
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