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

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Date:	Sat, 20 Feb 2010 19:19:10 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Anssi Hannula <anssi.hannula@....fi>
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

Am Samstag, 20. Februar 2010 17:03:41 schrieb Anssi Hannula:
> > 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.

What is the content of "level"?

> > 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).

That log makes sure that the final cancellation comes from closing
the file. Is that a log of a working run?

	Regards
		Oliver
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