ACPICA: Add repair for bad _MAT buffers
_MAT can inadvertently return an Integer instead of a Buffer
if the return value has been read from a Field whose width is
less than or equal to the global integer width (32 or 64 bits).
ACPICA BZ 810.
http://www.acpica.org/bugzilla/show_bug.cgi?id=810
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/acpica/nsrepair.c b/drivers/acpi/acpica/nsrepair.c
index dfa31c5..f2f5269 100644
--- a/drivers/acpi/acpica/nsrepair.c
+++ b/drivers/acpi/acpica/nsrepair.c
@@ -44,6 +44,7 @@
#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
+#include "acinterp.h"
#include "acpredef.h"
#define _COMPONENT ACPI_NAMESPACE
@@ -76,6 +77,7 @@
union acpi_operand_object *return_object = *return_object_ptr;
union acpi_operand_object *new_object;
acpi_size length;
+ acpi_status status;
/*
* At this point, we know that the type of the returned object was not
@@ -120,9 +122,26 @@
case ACPI_TYPE_INTEGER:
- /* Does the method/object legally return a string? */
+ /* 1) Does the method/object legally return a buffer? */
- if (expected_btypes & ACPI_RTYPE_STRING) {
+ if (expected_btypes & ACPI_RTYPE_BUFFER) {
+ /*
+ * Convert the Integer to a packed-byte buffer. _MAT needs
+ * this sometimes, if a read has been performed on a Field
+ * object that is less than or equal to the global integer
+ * size (32 or 64 bits).
+ */
+ status =
+ acpi_ex_convert_to_buffer(return_object,
+ &new_object);
+ if (ACPI_FAILURE(status)) {
+ return (status);
+ }
+ }
+
+ /* 2) Does the method/object legally return a string? */
+
+ else if (expected_btypes & ACPI_RTYPE_STRING) {
/*
* The only supported Integer-to-String conversion is to convert
* an integer of value 0 to a NULL string. The last element of