ACPICA: Resource Mgr: Small fix for buffer size calculation

Fixes a one byte error in the output buffer calculation.
Feng Tang - ACPICA BZ 849:
https://www.acpica.org/bugzilla/show_bug.cgi?id=849

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/acpica/rscalc.c b/drivers/acpi/acpica/rscalc.c
index 6851779855097fa69ac2ea870810cdb829a79ae6..147feb6aa2a0b3bdf26a9887ca84c362a2532cdc 100644 (file)
--- 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: