linux-kernel - Re: serial core: crash / race condition on unbind

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Message-ID: <531F9540.4020906@hurleysoftware.com>
Date:	Tue, 11 Mar 2014 18:59:12 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-serial@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Subject: Re: serial core: crash / race condition on unbind

On 03/11/2014 11:35 AM, Geert Uytterhoeven wrote:
> On Tue, Mar 11, 2014 at 12:49 PM, Peter Hurley <peter@...leysoftware.com> wrote:
>> On 03/11/2014 06:58 AM, Geert Uytterhoeven wrote:
>>> On Tue, Mar 11, 2014 at 4:14 AM, Peter Hurley <peter@...leysoftware.com>
>>> wrote:
>>>>>
>>>>>
>>>>>            [...]
>>>>>
>>>>>            /*
>>>>>             * Indicate that there isn't a port here anymore.
>>>>>             */
>>>>>            uport->type = PORT_UNKNOWN;
>>>>>
>>>>>            state->uart_port = NULL;
>>>>
>>>>
>>>> How did this ever work?
>>>>
>>>> Detaching the ll driver from the tty port in this manner is not ok;
>>>> as you already note, it blows up if consoles are still running.
>>>
>>> No one unbinds serial drivers using serial_core, as all these drivers are
>>> for fixed hardware?
>>
>> Yep, never tested until now :)
>> Do you need this to work?
>
> Well, "need" may be a bit strong. Crashes are not so nice.

:)

What I meant was, 'is this a debug situation that I can eventually get to?'
or 'are you on the verge of shipping product and this is a priority?'

Regards,
Peter Hurley

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