1 files changed, 11 insertions, 3 deletions

diff --git a/drivers/acpi/acpica/rscalc.c b/drivers/acpi/acpica/rscalc.c
index de12469d1c9c..147feb6aa2a0 100644
--- a/drivers/acpi/acpica/rscalc.c
+++ b/drivers/acpi/acpica/rscalc.c
@@ -457,6 +457,15 @@ acpi_rs_get_list_length(u8 * aml_buffer,
                          * Get the number of vendor data bytes
                          */
                         extra_struct_bytes = resource_length;
+
+                        /*
+                         * There is already one byte included in the minimum
+                         * descriptor size. If there are extra struct bytes,
+                         * subtract one from the count.
+                         */
+                        if (extra_struct_bytes) {
+                                extra_struct_bytes--;
+                        }
                         break;
 
                 case ACPI_RESOURCE_NAME_END_TAG:
@@ -601,7 +610,7 @@ acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object,
         /*
          * Calculate the size of the return buffer.
          * The base size is the number of elements * the sizes of the
-         * structures.  Additional space for the strings is added below.
+         * structures. Additional space for the strings is added below.
          * The minus one is to subtract the size of the u8 Source[1]
          * member because it is added below.
          *
@@ -664,8 +673,7 @@ acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object,
                                                      (*sub_object_list)->string.
                                                      length + 1);
                         } else {
-                                temp_size_needed +=
-                                    acpi_ns_get_pathname_length((*sub_object_list)->reference.node);
+                                temp_size_needed += acpi_ns_get_pathname_length((*sub_object_list)->reference.node);
                         }
                 } else {
                         /*