From b36e9a5492481728323509aa6179ce6bdab46953 Mon Sep 17 00:00:00 2001 Message-Id: In-Reply-To: <410c2f0190f74c35505beda6ff3f2da7819f8bac.1164352285.git.len.brown@intel.com> References: <410c2f0190f74c35505beda6ff3f2da7819f8bac.1164352285.git.len.brown@intel.com> From: Robert Moore Date: Tue, 14 Nov 2006 20:04:09 +0300 Subject: [PATCH 2/65] ACPICA: Handle mis-matched package length Reply-To: Len Brown Organization: Intel Open Source Technology Center Implement support within the AML interpreter for package objects that contain a mismatch between the AML length and package element count. In this case, the lesser of the two is used. Some BIOS code apparently modifies the package length on the fly, and this change supports this. Provides compatibility with the MS AML interpreter. Signed-off-by: Alexey Starikovskiy Signed-off-by: Len Brown --- 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 72190ab..aaeb9f9 100644 --- a/drivers/acpi/dispatcher/dsobject.c +++ b/drivers/acpi/dispatcher/dsobject.c @@ -318,9 +318,7 @@ acpi_ds_build_internal_package_obj(struc 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(struc } /* - * 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(struc */ 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 */ -- 1.4.4.1