[3.5.y.z extended stable] Patch "ACPICA: Interpreter: Fix Store() when implicit conversion is not" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    ACPICA: Interpreter: Fix Store() when implicit conversion is not

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 294b87e05953678e91792f03f2e5ae643990cd0c Mon Sep 17 00:00:00 2001
From: Bob Moore <robert.moore at intel.com>
Date: Mon, 31 Dec 2012 00:11:45 +0000
Subject: ACPICA: Interpreter: Fix Store() when implicit conversion is not
 possible.

commit 3f654bad3257427bea7ba1c4d43a23d99a03622b upstream.

For the cases such as a store of a string to an existing package
object, implement the store as a CopyObject().
This is a small departure from the ACPI specification which states
that the control method should be aborted in this case. However,
ASLTS suite depends on this behavior.

Signed-off-by: Bob Moore <robert.moore at intel.com>
Signed-off-by: Lv Zheng <lv.zheng at intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/acpi/acpica/exstore.c | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/drivers/acpi/acpica/exstore.c b/drivers/acpi/acpica/exstore.c
index c6cf843..f48036b 100644
--- a/drivers/acpi/acpica/exstore.c
+++ b/drivers/acpi/acpica/exstore.c
@@ -487,14 +487,33 @@ acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
 	default:

 		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
-				  "Storing %s (%p) directly into node (%p) with no implicit conversion\n",
+				  "Storing [%s] (%p) directly into node [%s] (%p)"
+				  " with no implicit conversion\n",
 				  acpi_ut_get_object_type_name(source_desc),
-				  source_desc, node));
+				  source_desc,
+				  acpi_ut_get_object_type_name(target_desc),
+				  node));

-		/* No conversions for all other types.  Just attach the source object */
+		/*
+		 * No conversions for all other types. Directly store a copy of
+		 * the source object. NOTE: This is a departure from the ACPI
+		 * spec, which states "If conversion is impossible, abort the
+		 * running control method".
+		 *
+		 * This code implements "If conversion is impossible, treat the
+		 * Store operation as a CopyObject".
+		 */
+		status =
+		    acpi_ut_copy_iobject_to_iobject(source_desc, &new_desc,
+						    walk_state);
+		if (ACPI_FAILURE(status)) {
+			return_ACPI_STATUS(status);
+		}

-		status = acpi_ns_attach_object(node, source_desc,
-					       source_desc->common.type);
+		status =
+		    acpi_ns_attach_object(node, new_desc,
+					  new_desc->common.type);
+		acpi_ut_remove_reference(new_desc);
 		break;
 	}

--
1.8.3.2