From 96f15efcea94545987715f453a8c2b8ea592d000 Mon Sep 17 00:00:00 2001 From: Len Brown Date: Fri, 17 Apr 2009 23:32:20 -0400 Subject: ACPI: Disable _GTS and _BFS support by default Executing BIOS code paths not exercised by Windows tends to get Linux into trouble. However, if a system does benefit from _GTS or _BFS, acpi.gts=1 an acpi.bfs=1 are now available to enable them. http://bugzilla.kernel.org/show_bug.cgi?id=13041 Signed-off-by: Len Brown --- drivers/acpi/acpica/hwsleep.c | 43 ++++++++++++++++++++++++++----------------- 1 file changed, 26 insertions(+), 17 deletions(-) (limited to 'drivers/acpi/acpica') diff --git a/drivers/acpi/acpica/hwsleep.c b/drivers/acpi/acpica/hwsleep.c index baa5fc05e12..db307a356f0 100644 --- a/drivers/acpi/acpica/hwsleep.c +++ b/drivers/acpi/acpica/hwsleep.c @@ -211,6 +211,12 @@ acpi_status acpi_enter_sleep_state_prep(u8 sleep_state) ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep) +static unsigned int gts, bfs; +module_param(gts, uint, 0644); +module_param(bfs, uint, 0644); +MODULE_PARM_DESC(gts, "Enable evaluation of _GTS on suspend."); +MODULE_PARM_DESC(bfs, "Enable evaluation of _BFS on resume".); + /******************************************************************************* * * FUNCTION: acpi_enter_sleep_state @@ -278,16 +284,18 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state) return_ACPI_STATUS(status); } - /* Execute the _GTS method */ + if (gts) { + /* Execute the _GTS method */ - arg_list.count = 1; - arg_list.pointer = &arg; - arg.type = ACPI_TYPE_INTEGER; - arg.integer.value = sleep_state; + arg_list.count = 1; + arg_list.pointer = &arg; + arg.type = ACPI_TYPE_INTEGER; + arg.integer.value = sleep_state; - status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL); - if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { - return_ACPI_STATUS(status); + status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL); + if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { + return_ACPI_STATUS(status); + } } /* Get current value of PM1A control */ @@ -513,18 +521,19 @@ acpi_status acpi_leave_sleep_state_prep(u8 sleep_state) } } - /* Execute the _BFS method */ + if (bfs) { + /* Execute the _BFS method */ - arg_list.count = 1; - arg_list.pointer = &arg; - arg.type = ACPI_TYPE_INTEGER; - arg.integer.value = sleep_state; + arg_list.count = 1; + arg_list.pointer = &arg; + arg.type = ACPI_TYPE_INTEGER; + arg.integer.value = sleep_state; - status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL); - if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { - ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS")); + status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL); + if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { + ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS")); + } } - return_ACPI_STATUS(status); } -- cgit v1.2.3-18-g5258