diff options
| -rw-r--r-- | drivers/acpi/dispatcher/dsobject.c | 27 |
1 files changed, 19 insertions, 8 deletions
diff --git a/drivers/acpi/dispatcher/dsobject.c b/drivers/acpi/dispatcher/dsobject.c index 72190abb1d5..aaeb9f987ec 100644 --- a/drivers/acpi/dispatcher/dsobject.c +++ b/drivers/acpi/dispatcher/dsobject.c @@ -318,9 +318,7 @@ acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state, obj_desc->package.node = parent->common.node; } - obj_desc->package.count = package_length; - - /* Count the number of items in the package list */ + /* Count the *actual* number of items in the package list */ arg = op->common.value.arg; arg = arg->common.next; @@ -329,11 +327,24 @@ acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state, } /* - * The package length (number of elements) will be the greater - * of the specified length and the length of the initializer list + * The number of elements in the package will be the lesser of the + * specified element count and the length of the initializer list. + * + * Even though the ASL compilers do not allow this to happen (for the + * fixed length package opcode), some BIOS code modifies the AML on the + * fly to adjust the package length, and this code compensates for that. + * This also provides compatibility with other AML interpreters. */ - if (package_list_length > package_length) { - obj_desc->package.count = package_list_length; + obj_desc->package.count = package_length; + + if (package_list_length != package_length) { + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Package length mismatch, using lesser of %X(Length Arg) and %X(AML Length)\n", + package_length, package_list_length)); + + if (package_list_length < package_length) { + obj_desc->package.count = package_list_length; + } } /* @@ -356,7 +367,7 @@ acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state, */ arg = op->common.value.arg; arg = arg->common.next; - for (i = 0; arg; i++) { + for (i = 0; i < obj_desc->package.count; i++) { if (arg->common.aml_opcode == AML_INT_RETURN_VALUE_OP) { /* Object (package or buffer) is already built */ |