From a94e88cdd8057fe8ea84bbb6d9a89a823c7bc49b Mon Sep 17 00:00:00 2001 From: Lv Zheng Date: Fri, 4 Apr 2014 12:39:11 +0800 Subject: ACPICA: Tables: Avoid SSDT installation with acpi_gbl_disable_ssdt_table_load. It is reported that when acpi_gbl_disable_ssdt_table_load is specified, user still can see it installed into /sys/firmware/acpi/tables on Linux boxes. This is because the option only stops table "loading", but doesn't stop table "installing", thus it is still in the acpi_gbl_root_table_list. With previous cleanups, it is possible to prevent SSDT installations to make it not such confusing. The global variable is also renamed. Lv Zheng. Signed-off-by: Lv Zheng [rjw: Subject] Signed-off-by: Rafael J. Wysocki --- drivers/acpi/acpica/tbinstal.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'drivers/acpi/acpica/tbinstal.c') diff --git a/drivers/acpi/acpica/tbinstal.c b/drivers/acpi/acpica/tbinstal.c index cf1ccc576629..de10d3245d9c 100644 --- a/drivers/acpi/acpica/tbinstal.c +++ b/drivers/acpi/acpica/tbinstal.c @@ -580,6 +580,18 @@ acpi_tb_install_non_fixed_table(acpi_physical_address address, return_ACPI_STATUS(status); } + /* + * Optionally do not load any SSDTs from the RSDT/XSDT. This can + * be useful for debugging ACPI problems on some machines. + */ + if (!reload && acpi_gbl_disable_ssdt_table_install && + ACPI_COMPARE_NAME(&new_table_desc.signature, ACPI_SIG_SSDT)) { + ACPI_INFO((AE_INFO, "Ignoring installation of %4.4s at %p", + new_table_desc.signature.ascii, ACPI_CAST_PTR(void, + address))); + goto release_and_exit; + } + /* Validate and verify a table before installation */ status = acpi_tb_verify_table(&new_table_desc, NULL); -- cgit v1.2.3