linux-kernel - Re: [PATCH v3 0/6] hid: Introduce device groups

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Message-ID: <alpine.LNX.2.00.1205011423130.1856@pobox.suse.cz>
Date:	Tue, 1 May 2012 14:23:57 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/6] hid: Introduce device groups

On Mon, 30 Apr 2012, Jiri Kosina wrote:

> > Ah, yes. I take it you are talking about tty/vt/keyboard.c. So some
> > random keypress during shutdown triggers the event, which eventually
> > reaches input_pass_event(). From there on, the trace stays in the
> > mentioned driver. First kbd_event() gets called, which takes the lock
> > and goes on to, in turn, call kbd_keycode(), k_handler[2]() ==
> > k_spec(), fn_handler[9]() == fn_hold(), which goes on to call
> > stop_tty(). This function comes back to the driver, via con_stop(), as
> > vt_kbd_con_stop(), which in turn takes the same lock. So unless the
> > teardown of something in hid affects the choices made in the tty
> > driver, it appears this is a different problem. Or?
> 
> I just came to the same conclusion a few minutes ago ... i.e. this is 
> likely unrelated to the patchset and I just triggered it by pure 
> coincidence on the patched kernel.
> 
> I will keep looking into it a little bit more. Dmitry, any immediate ideas 
> by any chance?

Okay, someone was able to get lockdep complain about this and Alan is 
apparently on it already:

	https://lkml.org/lkml/2012/5/1/69

So nothing to be worried about.

-- 
Jiri Kosina
SUSE Labs
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