linux-kernel - [bisected][resend] pnp: Huge number of "io resource overlap" messages

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Date:	Tue, 9 Sep 2008 12:50:06 +0200
From:	Frans Pop <elendil@...net.nl>
To:	linux-kernel@...r.kernel.org
Cc:	Rene Herman <rene.herman@...il.com>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [bisected][resend] pnp: Huge number of "io resource overlap" messages

The only thing I used to get for pnp 00:08 on my Toshiba Satellite A40
up to 2.6.26 was this single line:
pnp 00:08: can't add resource for IO 0xa8-0xa9

During bisecting I have found that fairly early in the 2.6.27 cycle this
was "fixed" and that message disappeared. The commit that changed this was:
commit aee3ad815dd291a7193ab01da0f1a30c84d00061
Author: Bjorn Helgaas <bjorn.helgaas@...com>
Date:   Fri Jun 27 16:56:57 2008 -0600
    PNP: replace pnp_resource_table with dynamically allocated resources

Was it expected that that change could lead to a message disappearing?
I don't really read that from the commit description.

So far for the intro, now the issue (regression?) that prompted this mail.

Now with 2.6.27-rc4/5 I'm suddenly getting a total of 78 (!) warnings
about "io resource overlaps" for pnp 00:08 in my dmesg, even though
AFAIK those have never caused any trouble.

Bisection identified this commit as the cause:
commit 999ed65ad12e374d7445fbc13f5a1d146ae4b0da
Author: Rene Herman <rene.herman@...il.com>
Date:   Fri Jul 25 19:44:47 2008 -0700
    pnp: have quirk_system_pci_resources() include io resources

The PCI devices mentioned in the messages (1f.5 and 1f.6) are the ICH4
AC'97 audio controller and AC'97 (software) modem. At least sound works
fine _without_ this change; I don't really use the softmodem.
I'm not completely sure what pnp 00:08 is. Seems to have the "system"
driver.

Anyway, I wonder if this patch is really desirable as a general check.

Full dmesg and kernel config attached.

Cheers,
FJP

View attachment "dmesg_2.6.27-rc5" of type "text/plain" (28021 bytes)

View attachment "config" of type "text/plain" (61914 bytes)