linux-kernel - Re: serial8250 madness

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Date:	Sat, 24 Jan 2009 09:12:39 -0600
From:	Clark Williams <williams@...hat.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Andrew Walrond <andrew@...rond.org>, linux-kernel@...r.kernel.org
Subject: Re: serial8250 madness

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On Fri, 23 Jan 2009 18:00:33 +0000
Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> 
> The big outstanding bug I know about is the incompatibility between the
> PnP 8250 drivers and serial console - that may be your machine C case.
> That one is rather hard to fix so on the long rather than short term hit
> list.
> 
> Alan


I spend a few days trying to figure out a panic in the uart driver that
turned out to be this issue. Would it make sense to add the following?

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 579d63a..35acc6b 100644
- --- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -91,7 +91,7 @@ config SERIAL_8250_PCI
 
 config SERIAL_8250_PNP
        tristate "8250/16550 PNP device support" if EMBEDDED
- -       depends on SERIAL_8250 && PNP
+       depends on SERIAL_8250 && PNP && ! SERIAL_8250_CONSOLE
        default SERIAL_8250
        help
          This builds standard PNP serial support. You may be able to

Clark
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