linux-kernel - [PATCH] ACPI / property: Fix subnode lookup scope for data-only subnodes

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Message-ID: <3607867.RKSpENdj9h@vostro.rjw.lan>
Date:	Wed, 21 Oct 2015 01:51:24 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Darren Hart <darren.hart@...el.com>
Subject: [PATCH] ACPI / property: Fix subnode lookup scope for data-only subnodes

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

The correct scope for looking up the objects to generate data packages for
data-only subnodes pointed to by another data-only subnode is the scope
of the parent of that subnode and not the scope containing the _DSD object
at the top of the hierarchy (the latter works only if all of the objects
returning data-only subnode packages in a given hierarchy are in the same
scope).

Fix the code to work as expected.

Fixes: 445b0eb058f5 (ACPI / property: Add support for data-only subnodes)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---

On top of linux-next.

Thanks,
Rafael

---
 drivers/acpi/property.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

Index: linux-pm/drivers/acpi/property.c
===================================================================
--- linux-pm.orig/drivers/acpi/property.c
+++ linux-pm/drivers/acpi/property.c
@@ -71,7 +71,14 @@ static bool acpi_nondev_subnode_ok(acpi_
 	if (acpi_extract_properties(buf.pointer, &dn->data))
 		dn->handle = handle;
 
-	if (acpi_enumerate_nondev_subnodes(scope, buf.pointer, &dn->data))
+	/*
+	 * The scope for the subnode object lookup is the one of the namespace
+	 * node (device) containing the object that has returned the package.
+	 * That is, it's the scope of that object's parent.
+	 */
+	status = acpi_get_parent(handle, &scope);
+	if (ACPI_SUCCESS(status)
+	    && acpi_enumerate_nondev_subnodes(scope, buf.pointer, &dn->data))
 		dn->handle = handle;
 
 	if (dn->handle) {

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