From: Nix <nix@esperi.org.uk>
To: Johan Hovold <johan@kernel.org>
Cc: Paul Martin <pm@debian.org>, Daniel Silverstone <dsilvers@debian.org>,
        Oliver Neukum <oliver@neukum.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org
Subject: Re: [3.16.1 BISECTED REGRESSION]: Simtec Entropy Key (cdc-acm) broken in 3.16
References: <878um4tg09.fsf@spindle.srvr.nix>
	<1409569752.24385.12.camel@linux-fkkt.site>
	<874mwnosz1.fsf@spindle.srvr.nix> <871tqe2zqt.fsf_-_@spindle.srvr.nix>
	<20141011195108.GA8275@thinkpad.nowster.org.uk>
	<87y4smz1l0.fsf@spindle.srvr.nix> <20141012185845.GB2786@localhost>
	<878uklynq9.fsf@spindle.srvr.nix> <20141014083432.GB7958@localhost>
	<871tq04fiy.fsf@spindle.srvr.nix> <20141022101458.GK2113@localhost>
Emacs: because editing your files should be a traumatic experience.
Date: Wed, 22 Oct 2014 16:36:59 +0100
In-Reply-To: <20141022101458.GK2113@localhost> (Johan Hovold's message of
	"Wed, 22 Oct 2014 12:14:58 +0200")
Message-ID: <87y4s8yv38.fsf@spindle.srvr.nix>
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Sender: linux-kernel-owner@vger.kernel.org

On 22 Oct 2014, Johan Hovold outgrape:

> On Wed, Oct 22, 2014 at 10:31:17AM +0100, Nix wrote:
>> On 14 Oct 2014, Johan Hovold verbalised:
>> 
>> > On Sun, Oct 12, 2014 at 10:36:30PM +0100, Nix wrote:
>> >> I have checked: this code is being executed against a symlink that
>> >> points to /dev/ttyACM0, and the tcsetattr() succeeds. (At least, it's
>> >> succeeding on the kernel I'm running now, but of course that's 3.16.5
>> >> with this commit reverted...)
>> >
>> > You could verify that by enabling debugging in the cdc-acm driver and
>> > making sure that the corresponding control messages are indeed sent on
>> > close.
>> 
>> I have a debugging dump at
>> <http://www.esperi.org.uk/~nix/temporary/cdc-acm.log>; it's fairly
>
> What kernel were you using here? The log seems to suggest that it was
> generated with the commit in question reverted.

Look now :) (the previous log is still there in cdc-acm-reverted.log.)

This contains two boots -- one on which the USB key worked, and the next
(with an identical kernel) with which the key was broken. (I'm not sure
whether this problem happens at startup or shutdown time, so it seemed
best to provide both.)

-- 
NULL && (void)
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