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

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Message-Id: <201002212309.57715.oliver@neukum.org>
Date:	Sun, 21 Feb 2010 23:09:57 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Anssi Hannula <anssi.hannula@....fi>,
	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 Sonntag, 21. Februar 2010 22:28:54 schrieb Alan Stern:
> > > 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?
> 
> Could this simply be one of those cases where the device file is closed 
> just after the final write URB is submitted but before it can complete, 
> so the URB gets cancelled and the data isn't transferred?

It looks likely, but why doesn't a delay fix it?

	Regards
		Oliver
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