linux-kernel - Re: PROBLEM: kernel oops with g

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Date:	Wed, 24 Jun 2009 16:43:48 -0700
From:	David Brownell <david-b@...bell.net>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	"'Alan Cox'" <alan@...rguk.ukuu.org.uk>,
	"'Alan Stern'" <stern@...land.harvard.edu>,
	"'Peter Korsgaard'" <jacmet@...site.dk>,
	"'USB list'" <linux-usb@...r.kernel.org>,
	"'Kernel development list'" <linux-kernel@...r.kernel.org>,
	kyungmin.park@...sung.com
Subject: Re: PROBLEM: kernel oops with g_serial USB gadget on 2.6.30

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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