X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Facpi%2Facpica%2Fexprep.c;h=2fbfe51fb141a6858f912681d0b15e6b976b85f1;hb=54b41b97fd07842d8b64963d538003c5f756ca12;hp=a610ebe18edd2e2a5754fb67d25897a2e55bd3a3;hpb=9343af084c7e8911897b0883042ee690cee3aaef;p=pandora-kernel.git

diff --git a/drivers/acpi/acpica/exprep.c b/drivers/acpi/acpica/exprep.c
index a610ebe18edd..2fbfe51fb141 100644
--- a/drivers/acpi/acpica/exprep.c
+++ b/drivers/acpi/acpica/exprep.c
@@ -471,13 +471,18 @@ acpi_status acpi_ex_prep_field_value(struct acpi_create_field_info *info)
 		/* allow full data read from EC address space */
 		if (obj_desc->field.region_obj->region.space_id ==
 			ACPI_ADR_SPACE_EC) {
-			if (obj_desc->common_field.bit_length > 8)
-				obj_desc->common_field.access_bit_width =
-				ACPI_ROUND_UP(obj_desc->common_field.
-							bit_length, 8);
+			if (obj_desc->common_field.bit_length > 8) {
+				unsigned width =
+					ACPI_ROUND_BITS_UP_TO_BYTES(
+					obj_desc->common_field.bit_length);
+				// access_bit_width is u8, don't overflow it
+				if (width > 8)
+					width = 8;
 				obj_desc->common_field.access_byte_width =
-				ACPI_DIV_8(obj_desc->common_field.
-							access_bit_width);
+							width;
+				obj_desc->common_field.access_bit_width =
+							8 * width;
+			}
 		}
 
 		ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,