linux-kernel - Re: 2.6.22-rc: regression: no irda0 interface (2.6.21 was OK), smsc does not find chip

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Date:	Mon, 13 Aug 2007 19:39:06 +0200
From:	Peter Stuge <stuge-linux-pcmcia@....org>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	Andrey Borzenkov <arvidjaar@...l.ru>,
	Samuel Ortiz <samuel@...tiz.org>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	linux-pcmcia@...ts.infradead.org, linux-kernel@...r.kernel.org,
	"Linus Walleij \(LD/EAB\)" <linus.walleij@...csson.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: 2.6.22-rc: regression: no irda0 interface (2.6.21 was OK), smsc does not find chip

On Mon, Aug 13, 2007 at 10:09:46AM -0600, Bjorn Helgaas wrote:
> > [ 2207.986873] smsc_ircc_present: can't get sir_base of 0x2e8
> 
> As of 2.6.23-rc2, we should have:
>   - probes for 8250 legacy devices (as in 2.6.21 and previous)
>   - smsc PNP probes turned off by default (2.6.21 and previous had
>     no PNP probes for smsc at all)
>   - some complicated PNP quirks for SMCf010 devices
> 
> In other words, I think we're basically back where we started.  The
> 8250 driver should find a ttyS3 device at 0x2e8, and it should
> claim those ports, which will prevent smsc from claiming them.

I use 8250.nr_uarts=1 appended to my kernel parameters on my laptop.
Perfectly reliable workaround, but if it is possible to detect, then
all the better!


//Peter
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