linux-kernel - Re: WARNING: CPU: 0 PID: 2623 at drivers/pnp/pnpacpi/core.c:96 pnpacpi_set

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Message-ID: <2026468.U7VDB8Dm9m@vostro.rjw.lan>
Date:	Tue, 29 Jul 2014 23:10:19 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Vinson Lee <vlee@...pensource.com>
Cc:	William Dauchy <wdauchy@...il.com>,
	Zdenek Kabelac <zkabelac@...hat.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: WARNING: CPU: 0 PID: 2623 at drivers/pnp/pnpacpi/core.c:96 pnpacpi_set_resource

On Tuesday, July 29, 2014 11:13:55 AM Vinson Lee wrote:
> On Tue, Jul 29, 2014 at 2:53 AM, William Dauchy <wdauchy@...il.com> wrote:
> > Hi Vinson,
> >
> > On Mon, Jul 28, 2014 at 9:11 PM, Vinson Lee <vlee@...pensource.com> wrote:
> >> The warning first happens with 3.14-rc1. The warning does not occur with 3.13.0.
> >
> > Hitting the same issue here with a similar trace on 3.14.x. Did you
> > start bisecting?
> >
> > Regards,
> > --
> > William
> 
> 
> I bisected the warning that I'm seeing to this commit.
> 
> commit 202317a573b20d77a9abb7c16a3fd5b40cef3d9d
> Author: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Date:   Fri Nov 22 21:54:37 2013 +0100
> 
>     ACPI / scan: Add acpi_device objects for all device nodes in the namespace

Interesting.

Does the appended patch make any difference?

Rafael

---
 drivers/pnp/pnpacpi/core.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

Index: linux-pm/drivers/pnp/pnpacpi/core.c
===================================================================
--- linux-pm.orig/drivers/pnp/pnpacpi/core.c
+++ linux-pm/drivers/pnp/pnpacpi/core.c
@@ -319,8 +319,7 @@ static int __init acpi_pnp_match(struct
 	struct pnp_dev *pnp = _pnp;
 
 	/* true means it matched */
-	return !acpi->physical_node_count
-	    && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
+	return pnp->data == acpi;
 }
 
 static struct acpi_device * __init acpi_pnp_find_companion(struct device *dev)

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