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

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Date:	Sat, 20 Feb 2010 18:03:41 +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 15 helmikuu 2010 15:08:27 Oliver Neukum wrote:
> Am Samstag, 13. Februar 2010 20:01:54 schrieb Anssi Hannula:
> > > I'll get back to this later today, including testing with mdelay in
> > > port_release with the extra sleep calls in gobi_loader.
> > 
> > port_release is only called when the serial device is removed, so this
> > has no effect here.
> 
> But something must kill your last URB.
> You are not using autosuspend are you?

Don't know, usbcore has autosuspend=2 and the gobi device has autosuspend=2 
and supports_autosuspend=1.

> Can load usbserial with "debug=1"?

Here's the end of dmesg when running with that option:
http://stuff.onse.fi/gobi2000/gobi-regression.dmesg.log

This is again with the gobi_loader with extra sleep added in the beginning. 
Otherwise it hangs (which is the actual original problem).

-- 
Anssi Hannula
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