linux-kernel - Re: [patch 0/2] serial: explicitly request ttyS0-3 for COM1-4

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Message-ID: <20080116183933.GB23371@flint.arm.linux.org.uk>
Date:	Wed, 16 Jan 2008 18:39:34 +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 0/2] serial: explicitly request ttyS0-3 for COM1-4

On Wed, Jan 16, 2008 at 10:05:41AM -0700, Bjorn Helgaas wrote:
> When 8250_pnp discovers COM ports, we only get the correct ttyS names
> by accident -- we rely on serial8250_isa_init_ports(), which discovers
> the COM ports earlier using the addresses in SERIAL_PORT_DFNS.

It's not by accident but by design.  It's quite intentional that it
remembers the addresses of serial ports, and if another port is
registered later with the same base address, it gets the same name.

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