linux-kernel - Re: PNPACPI probes serial twice, messes up serial console

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Message-Id: <200703211035.39340.bjorn.helgaas@hp.com>
Date:	Wed, 21 Mar 2007 10:35:38 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Keith Owens <kaos@....com.au>
Cc:	linux-kernel@...r.kernel.org, len.brown@...el.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Russell King <rmk+lkml@....linux.org.uk>
Subject: Re: PNPACPI probes serial twice, messes up serial console

On Tuesday 20 March 2007 08:32, Bjorn Helgaas wrote:
> On Tuesday 20 March 2007 00:46, Keith Owens wrote:
> > Booting with 'console=tty console=ttyS0,9600'.  The serial console on
> > ttyS0 (0x3f8, irq 4) is probed twice, once from serial8250_init() and
> > again from serial_pnp_probe().
> 
> I played with this last summer, but was too timid to finish it
> and post it.  My plan was to remove the legacy SERIAL_PORT_DFNS,
> make platform devices for them, and only register the platform
> devices in the absence of PNP.
> 
> My motivation at the time was to prevent 8250 from claiming IRDA
> devices that happened to live at legacy UART addresses.  I also
> wanted to make IRDA (smsc-ircc2 in my case) smart enough to use
> PNP to locate its devices, since 8250 would no longer claim them.
> 
> Here's the dusty patch (against 2.6.18-rc1-mm2).  If it seems
> like a reasonable thing to do, I can update it, polish it up,
> add a changelog, and post it.

Keith, does this patch help?  Russell didn't complain about it, so
if it fixes your problem, maybe we could put it in -mm and see if
it breaks anything else.

Bjorn
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