X-Git-Url: http://git.cascardo.info/?a=blobdiff_plain;f=drivers%2Facpi%2Facpica%2Futosi.c;h=f0484b058c4493088ce63a5f685ec68bbada94a7;hb=3f62d5269bc59ce3797397cc54edab17fbe60682;hp=3f5fed670271cc4804d69427e0209ab2f4f8d10a;hpb=99eb45f98c1355998bc2b0bd83e51f79e6d2d0b4;p=cascardo%2Flinux.git

diff --git a/drivers/acpi/acpica/utosi.c b/drivers/acpi/acpica/utosi.c
index 3f5fed670271..f0484b058c44 100644
--- a/drivers/acpi/acpica/utosi.c
+++ b/drivers/acpi/acpica/utosi.c
@@ -390,11 +390,22 @@ struct acpi_interface_info *acpi_ut_get_interface(acpi_string interface_name)
  * PARAMETERS:  walk_state          - Current walk state
  *
  * RETURN:      Status
+ *              Integer: TRUE (0) if input string is matched
+ *                       FALSE (-1) if string is not matched
  *
  * DESCRIPTION: Implementation of the _OSI predefined control method. When
  *              an invocation of _OSI is encountered in the system AML,
  *              control is transferred to this function.
  *
+ * (August 2016)
+ * Note:  _OSI is now defined to return "Ones" to indicate a match, for
+ * compatibility with other ACPI implementations. On a 32-bit DSDT, Ones
+ * is 0xFFFFFFFF. On a 64-bit DSDT, Ones is 0xFFFFFFFFFFFFFFFF
+ * (ACPI_UINT64_MAX).
+ *
+ * This function always returns ACPI_UINT64_MAX for TRUE, and later code
+ * will truncate this to 32 bits if necessary.
+ *
  ******************************************************************************/
 
 acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
@@ -404,7 +415,7 @@ acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
 	struct acpi_interface_info *interface_info;
 	acpi_interface_handler interface_handler;
 	acpi_status status;
-	u32 return_value;
+	u64 return_value;
 
 	ACPI_FUNCTION_TRACE(ut_osi_implementation);
 
@@ -444,7 +455,7 @@ acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
 			acpi_gbl_osi_data = interface_info->value;
 		}
 
-		return_value = ACPI_UINT32_MAX;
+		return_value = ACPI_UINT64_MAX;
 	}
 
 	acpi_os_release_mutex(acpi_gbl_osi_mutex);
@@ -456,9 +467,10 @@ acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
 	 */
 	interface_handler = acpi_gbl_interface_handler;
 	if (interface_handler) {
-		return_value =
-		    interface_handler(string_desc->string.pointer,
-				      return_value);
+		if (interface_handler
+		    (string_desc->string.pointer, (u32)return_value)) {
+			return_value = ACPI_UINT64_MAX;
+		}
 	}
 
 	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,