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SubjectRe: PNPACPI probes serial twice, messes up serial console
On Wed, Mar 21, 2007 at 10:35:38AM -0600, Bjorn Helgaas wrote:
> 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.

Yes I did.

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