diff options
Diffstat (limited to 'drivers/acpi/tables/tbutils.c')
| -rw-r--r-- | drivers/acpi/tables/tbutils.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/drivers/acpi/tables/tbutils.c b/drivers/acpi/tables/tbutils.c index 5bcafebb9ddf..4b2fbb592f49 100644 --- a/drivers/acpi/tables/tbutils.c +++ b/drivers/acpi/tables/tbutils.c @@ -80,14 +80,24 @@ acpi_status acpi_tb_is_table_installed(struct acpi_table_desc *new_table_desc) /* Examine all installed tables of this type */ while (table_desc) { - /* Compare Revision and oem_table_id */ - + /* + * If the table lengths match, perform a full bytewise compare. This + * means that we will allow tables with duplicate oem_table_id(s), as + * long as the tables are different in some way. + * + * Checking if the table has been loaded into the namespace means that + * we don't check for duplicate tables during the initial installation + * of tables within the RSDT/XSDT. + */ if ((table_desc->loaded_into_namespace) && - (table_desc->pointer->revision == - new_table_desc->pointer->revision) && - (!ACPI_MEMCMP(table_desc->pointer->oem_table_id, - new_table_desc->pointer->oem_table_id, 8))) { - /* This table is already installed */ + (table_desc->pointer->length == + new_table_desc->pointer->length) + && + (!ACPI_MEMCMP + ((const char *)table_desc->pointer, + (const char *)new_table_desc->pointer, + (acpi_size) new_table_desc->pointer->length))) { + /* Match: this table is already installed */ ACPI_DEBUG_PRINT((ACPI_DB_TABLES, "Table [%4.4s] already installed: Rev %X oem_table_id [%8.8s]\n", |