linux-kernel - Re: [PATCH 2/2] serial: sh-sci: Add missing call to uart_remove_one

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Date:	Thu, 6 Mar 2014 13:19:13 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-serial@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...ux-m68k.org>
Subject: Re: [PATCH 2/2] serial: sh-sci: Add missing call to
 uart_remove_one_port() in failure path

On Fri, Feb 28, 2014 at 02:21:33PM +0100, Geert Uytterhoeven wrote:
> From: Geert Uytterhoeven <geert+renesas@...ux-m68k.org>
> 
> If cpufreq_register_notifier() fails, we have to remove the port added by
> sci_probe_single(), which is not done by sci_cleanup_single().
> 
> Else the serial port stays active from the point of view of the serial
> subsystem, and it may crash when userspace getty is started, or when the
> loadable driver module is unloaded.
> 
> This was introduced by commit 6dae14216c85eea13db7b12c469475c5d30e5499
> ("serial: sh-sci: Fix probe error paths").
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...ux-m68k.org>

Acked-by: Simon Horman <horms+renesas@...ge.net.au>

This looks reasonable to me.

Greg, could you take this one?


> ---
> This depends on "serial_core: Unregister console in uart_remove_one_port()"
> when using a serial console.
> ---
>  drivers/tty/serial/sh-sci.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
> index be33d2b0613b..7958115e6a51 100644
> --- a/drivers/tty/serial/sh-sci.c
> +++ b/drivers/tty/serial/sh-sci.c
> @@ -2564,6 +2564,7 @@ static int sci_probe(struct platform_device *dev)
>  	ret = cpufreq_register_notifier(&sp->freq_transition,
>  					CPUFREQ_TRANSITION_NOTIFIER);
>  	if (unlikely(ret < 0)) {
> +		uart_remove_one_port(&sci_uart_driver, &sp->port);
>  		sci_cleanup_single(sp);
>  		return ret;
>  	}
> -- 
> 1.7.9.5
> 
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