Re: [PATCH v4] serial: 8250: Fix autoconfig_irq() to avoid race conditions

[Thomas Gleixner]

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@xxxxxxxxxxxxx>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/