3 files changed, 4 insertions, 20 deletions

diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
index eaa60c94205a..1f32caa87686 100644
--- a/drivers/acpi/acpi_platform.c
+++ b/drivers/acpi/acpi_platform.c
@@ -30,6 +30,7 @@ static const struct acpi_device_id forbidden_id_list[] = {
 	{"PNP0200",  0},	/* AT DMA Controller */
 	{"ACPI0009", 0},	/* IOxAPIC */
 	{"ACPI000A", 0},	/* IOAPIC */
+	{"SMB0001",  0},	/* ACPI SMBUS virtual device */
 	{"", 0},
 };
 
diff --git a/drivers/acpi/acpica/exserial.c b/drivers/acpi/acpica/exserial.c
index 0d42f30e5b25..9920fac6413f 100644
--- a/drivers/acpi/acpica/exserial.c
+++ b/drivers/acpi/acpica/exserial.c
@@ -244,7 +244,6 @@ acpi_ex_write_serial_bus(union acpi_operand_object *source_desc,
 {
 	acpi_status status;
 	u32 buffer_length;
-	u32 data_length;
 	void *buffer;
 	union acpi_operand_object *buffer_desc;
 	u32 function;
@@ -282,14 +281,12 @@ acpi_ex_write_serial_bus(union acpi_operand_object *source_desc,
 	case ACPI_ADR_SPACE_SMBUS:
 
 		buffer_length = ACPI_SMBUS_BUFFER_SIZE;
-		data_length = ACPI_SMBUS_DATA_SIZE;
 		function = ACPI_WRITE | (obj_desc->field.attribute << 16);
 		break;
 
 	case ACPI_ADR_SPACE_IPMI:
 
 		buffer_length = ACPI_IPMI_BUFFER_SIZE;
-		data_length = ACPI_IPMI_DATA_SIZE;
 		function = ACPI_WRITE;
 		break;
 
@@ -310,7 +307,6 @@ acpi_ex_write_serial_bus(union acpi_operand_object *source_desc,
 		/* Add header length to get the full size of the buffer */
 
 		buffer_length += ACPI_SERIAL_HEADER_SIZE;
-		data_length = source_desc->buffer.pointer[1];
 		function = ACPI_WRITE | (accessor_type << 16);
 		break;
 
@@ -318,20 +314,6 @@ acpi_ex_write_serial_bus(union acpi_operand_object *source_desc,
 		return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
 	}
 
-#if 0
-	OBSOLETE ?
-	    /* Check for possible buffer overflow */
-	    if (data_length > source_desc->buffer.length) {
-		ACPI_ERROR((AE_INFO,
-			    "Length in buffer header (%u)(%u) is greater than "
-			    "the physical buffer length (%u) and will overflow",
-			    data_length, buffer_length,
-			    source_desc->buffer.length));
-
-		return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
-	}
-#endif
-
 	/* Create the transfer/bidirectional/return buffer */
 
 	buffer_desc = acpi_ut_create_buffer_object(buffer_length);
@@ -342,7 +324,8 @@ acpi_ex_write_serial_bus(union acpi_operand_object *source_desc,
 	/* Copy the input buffer data to the transfer buffer */
 
 	buffer = buffer_desc->buffer.pointer;
-	memcpy(buffer, source_desc->buffer.pointer, data_length);
+	memcpy(buffer, source_desc->buffer.pointer,
+	       min(buffer_length, source_desc->buffer.length));
 
 	/* Lock entire transaction if requested */
 
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 2a361e22d38d..70f4e80b9246 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -700,7 +700,7 @@ static void iort_set_device_domain(struct device *dev,
  */
 static struct irq_domain *iort_get_platform_device_domain(struct device *dev)
 {
-	struct acpi_iort_node *node, *msi_parent;
+	struct acpi_iort_node *node, *msi_parent = NULL;
 	struct fwnode_handle *iort_fwnode;
 	struct acpi_iort_its_group *its;
 	int i;