linux-kernel - Re: [PATCH v4] serial: 8250: Fix autoconfig

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Date:	Mon, 17 Aug 2015 21:22:48 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Taichi Kageyama <t-kageyama@...jp.nec.com>
cc:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"peter@...leysoftware.com" <peter@...leysoftware.com>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jslaby@...e.cz" <jslaby@...e.cz>,
	"prarit@...hat.com" <prarit@...hat.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	"jiang.liu@...ux.intel.com" <jiang.liu@...ux.intel.com>
Subject: Re: [PATCH v4] serial: 8250: Fix autoconfig_irq() to avoid race
 conditions

On Mon, 17 Aug 2015, Taichi Kageyama wrote:
> diff --git tty-next.org/drivers/tty/serial/8250/8250_port.c tty-next.work/drivers/tty/serial/8250/8250_port.c
> index 54e6c8d..9300b59 100644
> --- tty-next.org/drivers/tty/serial/8250/8250_port.c
> +++ tty-next.work/drivers/tty/serial/8250/8250_port.c
> @@ -1238,6 +1238,9 @@ static void autoconfig_irq(struct uart_8250_port *up)
>  		inb_p(ICP);
>  	}
>  
> +	if (uart_console(port))
> +		console_lock();
> +
>  	/* forget possible initially masked and pending IRQ */
>  	probe_irq_off(probe_irq_on());
>  	save_mcr = serial_in(up, UART_MCR);
> @@ -1269,6 +1272,9 @@ static void autoconfig_irq(struct uart_8250_port *up)
>  	if (port->flags & UPF_FOURPORT)
>  		outb_p(save_ICP, ICP);
>  
> +	if (uart_console(port))
> +		console_unlock();
> +
>  	port->irq = (irq > 0) ? irq : 0;
>  }

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
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