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

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Message-ID: <CAMuHMdUeUjuBe0tWpYBZqwqWT=euPAn6fwzmXMYCP573Q1BDXQ@mail.gmail.com>
Date:	Tue, 11 Mar 2014 11:58:01 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Peter Hurley <peter@...leysoftware.com>
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

Hi Peter,

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?

Hot-pluggable usb-serial doesn't use serial_core.

Thanks!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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