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From: Oliver Neukum <oliver@neukum.org>
To: Pavel Machek <pavel@ucw.cz>
Subject: Re: ttyACM0: 2.6.30-rc7 dies on device disconnect, strange echo (regressions)
Date: Tue, 2 Jun 2009 15:20:11 +0200
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Cc: kernel list <linux-kernel@vger.kernel.org>, Greg KH <greg@kroah.com>,
       "Rafael J. Wysocki" <rjw@sisk.pl>
References: <20090601101421.GA1914@elf.ucw.cz> <200906011434.57083.oliver@neukum.org> <20090602091912.GD15756@elf.ucw.cz>
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Am Dienstag, 2. Juni 2009 11:19:13 schrieb Pavel Machek:
> On Mon 2009-06-01 14:34:56, Oliver Neukum wrote:
> > Am Montag, 1. Juni 2009 13:31:51 schrieb Pavel Machek:
> > > Steps to reproduce:
> > >
> > > minicom /dev/ttyACM0
> > >
> > > Bug #2: try to interactivelly communicate with the other
> > > device. Notice that characters are echoed one character too late. You
> > > type "hello", but only "hell" appears. You press "!", "o" appears.
> > >
> > > Bug #1: while minicom is still connected, pull the USB cable. Machine
> > > locks hard.
> >
> > I can replicate neither bug with 2.6.30-rc7. Can you replicate it with
> > anything but openMOKO?
>
> So AT commands echo properly on USB modem or something? Bad :-(.

My cell phone echoes back arbitrary strings.

> I'm afraid I do not have another ACM device near me. I guess going
> through cdc-acm.c 's history would be relevant?

A bisection would indeed be very good.

	Regards
		Oliver