linux-kernel - Re: [patch 2/2] 8250_pnp: register x86 COM ports at the conventional ttyS names

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Date:	Wed, 16 Jan 2008 18:42:06 +0000
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org, Jeff Garzik <jeff@...zik.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch 2/2] 8250_pnp: register x86 COM ports at the conventional ttyS names

On Wed, Jan 16, 2008 at 10:05:43AM -0700, Bjorn Helgaas wrote:
>  static int __devinit
> +serial_pnp_line(struct uart_port *port)
> +{
> +#ifdef CONFIG_X86
> +	switch (port->iobase) {
> +	case 0x3f8:	return 0;	/* COM1 -> ttyS0 */
> +	case 0x2f8:	return 1;	/* COM2 -> ttyS1 */
> +	case 0x3e8:	return 2;	/* COM3 -> ttyS2 */
> +	case 0x2e8:	return 3;	/* COM4 -> ttyS3 */
> +	}
> +#endif

So what if someone intentionally modifies SERIAL_DEFN_PORTS to point
ttyS[0-3] somewhere else?  They also have to modify this code as well.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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