--- zzzz-none-000/linux-3.10.107/drivers/acpi/acpica/exfield.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/acpi/acpica/exfield.c	2021-02-04 17:41:59.000000000 +0000
@@ -5,7 +5,7 @@
  *****************************************************************************/
 
 /*
- * Copyright (C) 2000 - 2013, Intel Corp.
+ * Copyright (C) 2000 - 2015, Intel Corp.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -45,10 +45,71 @@
 #include "accommon.h"
 #include "acdispat.h"
 #include "acinterp.h"
+#include "amlcode.h"
 
 #define _COMPONENT          ACPI_EXECUTER
 ACPI_MODULE_NAME("exfield")
 
+/* Local prototypes */
+static u32
+acpi_ex_get_serial_access_length(u32 accessor_type, u32 access_length);
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_get_serial_access_length
+ *
+ * PARAMETERS:  accessor_type   - The type of the protocol indicated by region
+ *                                field access attributes
+ *              access_length   - The access length of the region field
+ *
+ * RETURN:      Decoded access length
+ *
+ * DESCRIPTION: This routine returns the length of the generic_serial_bus
+ *              protocol bytes
+ *
+ ******************************************************************************/
+
+static u32
+acpi_ex_get_serial_access_length(u32 accessor_type, u32 access_length)
+{
+	u32 length;
+
+	switch (accessor_type) {
+	case AML_FIELD_ATTRIB_QUICK:
+
+		length = 0;
+		break;
+
+	case AML_FIELD_ATTRIB_SEND_RCV:
+	case AML_FIELD_ATTRIB_BYTE:
+
+		length = 1;
+		break;
+
+	case AML_FIELD_ATTRIB_WORD:
+	case AML_FIELD_ATTRIB_WORD_CALL:
+
+		length = 2;
+		break;
+
+	case AML_FIELD_ATTRIB_MULTIBYTE:
+	case AML_FIELD_ATTRIB_RAW_BYTES:
+	case AML_FIELD_ATTRIB_RAW_PROCESS:
+
+		length = access_length;
+		break;
+
+	case AML_FIELD_ATTRIB_BLOCK:
+	case AML_FIELD_ATTRIB_BLOCK_CALL:
+	default:
+
+		length = ACPI_GSBUS_BUFFER_SIZE - 2;
+		break;
+	}
+
+	return (length);
+}
+
 /*******************************************************************************
  *
  * FUNCTION:    acpi_ex_read_data_from_field
@@ -63,8 +124,9 @@
  *              Buffer, depending on the size of the field.
  *
  ******************************************************************************/
+
 acpi_status
-acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
+acpi_ex_read_data_from_field(struct acpi_walk_state * walk_state,
 			     union acpi_operand_object *obj_desc,
 			     union acpi_operand_object **ret_buffer_desc)
 {
@@ -73,6 +135,7 @@
 	acpi_size length;
 	void *buffer;
 	u32 function;
+	u16 accessor_type;
 
 	ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);
 
@@ -116,9 +179,21 @@
 			    ACPI_READ | (obj_desc->field.attribute << 16);
 		} else if (obj_desc->field.region_obj->region.space_id ==
 			   ACPI_ADR_SPACE_GSBUS) {
-			length = ACPI_GSBUS_BUFFER_SIZE;
-			function =
-			    ACPI_READ | (obj_desc->field.attribute << 16);
+			accessor_type = obj_desc->field.attribute;
+			length = acpi_ex_get_serial_access_length(accessor_type,
+								  obj_desc->
+								  field.
+								  access_length);
+
+			/*
+			 * Add additional 2 bytes for the generic_serial_bus data buffer:
+			 *
+			 *     Status;      (Byte 0 of the data buffer)
+			 *     Length;      (Byte 1 of the data buffer)
+			 *     Data[x-1];   (Bytes 2-x of the arbitrary length data buffer)
+			 */
+			length += 2;
+			function = ACPI_READ | (accessor_type << 16);
 		} else {	/* IPMI */
 
 			length = ACPI_IPMI_BUFFER_SIZE;
@@ -228,7 +303,7 @@
 	status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
 	acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
 
-      exit:
+exit:
 	if (ACPI_FAILURE(status)) {
 		acpi_ut_remove_reference(buffer_desc);
 	} else {
@@ -262,6 +337,7 @@
 	void *buffer;
 	union acpi_operand_object *buffer_desc;
 	u32 function;
+	u16 accessor_type;
 
 	ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);
 
@@ -315,9 +391,21 @@
 			    ACPI_WRITE | (obj_desc->field.attribute << 16);
 		} else if (obj_desc->field.region_obj->region.space_id ==
 			   ACPI_ADR_SPACE_GSBUS) {
-			length = ACPI_GSBUS_BUFFER_SIZE;
-			function =
-			    ACPI_WRITE | (obj_desc->field.attribute << 16);
+			accessor_type = obj_desc->field.attribute;
+			length = acpi_ex_get_serial_access_length(accessor_type,
+								  obj_desc->
+								  field.
+								  access_length);
+
+			/*
+			 * Add additional 2 bytes for the generic_serial_bus data buffer:
+			 *
+			 *     Status;      (Byte 0 of the data buffer)
+			 *     Length;      (Byte 1 of the data buffer)
+			 *     Data[x-1];   (Bytes 2-x of the arbitrary length data buffer)
+			 */
+			length += 2;
+			function = ACPI_WRITE | (accessor_type << 16);
 		} else {	/* IPMI */
 
 			length = ACPI_IPMI_BUFFER_SIZE;
@@ -340,7 +428,7 @@
 		}
 
 		buffer = buffer_desc->buffer.pointer;
-		ACPI_MEMCPY(buffer, source_desc->buffer.pointer, length);
+		memcpy(buffer, source_desc->buffer.pointer, length);
 
 		/* Lock entire transaction if requested */
 
@@ -398,21 +486,25 @@
 
 	switch (source_desc->common.type) {
 	case ACPI_TYPE_INTEGER:
+
 		buffer = &source_desc->integer.value;
 		length = sizeof(source_desc->integer.value);
 		break;
 
 	case ACPI_TYPE_BUFFER:
+
 		buffer = source_desc->buffer.pointer;
 		length = source_desc->buffer.length;
 		break;
 
 	case ACPI_TYPE_STRING:
+
 		buffer = source_desc->string.pointer;
 		length = source_desc->string.length;
 		break;
 
 	default:
+
 		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 	}