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From: David Brownell <david-b@pacbell.net>
To: Marek Szyprowski <m.szyprowski@samsung.com>
Subject: Re: PROBLEM: kernel oops with g_serial USB gadget on 2.6.30
Date: Wed, 24 Jun 2009 16:43:48 -0700
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Cc: "'Alan Cox'" <alan@lxorguk.ukuu.org.uk>,
       "'Alan Stern'" <stern@rowland.harvard.edu>,
       "'Peter Korsgaard'" <jacmet@sunsite.dk>,
       "'USB list'" <linux-usb@vger.kernel.org>,
       "'Kernel development list'" <linux-kernel@vger.kernel.org>,
       kyungmin.park@samsung.com
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On Wednesday 24 June 2009, Marek Szyprowski wrote:
> 
> > So it's looking like tty->driver_data is somehow NULL. ?That's
> > never supposed to happen. ?Did gs_open() fail or something?
> 
> I've triggered this bug by running a 'getty -L 115200 ttyGS0 vt100' and trying
> to login on that usb console and then pressing 'enter' key for longer time.
> getty might abort after a few failed logins, so the /dev/ttyGS0 file might be
> closed before all characters that need to be echoed were processed (usb udc debug
> messages really slows it down). This is however a pure guessing, I know nothing
> about tty framework and internals.

Hmm, that would mean the shutdown processing isn't behaving
right.  Plausible, it's tricky to test.

Patches accepted.  ;)


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