diff options
| author | Len Brown <len.brown@intel.com> | 2009-04-24 01:35:24 -0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-04-24 01:35:24 -0400 |
| commit | ac0849fb6c66ca865270fda32bcbc39f6dd52de1 (patch) | |
| tree | a103bf7e2a2c8ed3be63221a51233caefa32ad08 /drivers/acpi/sleep.c | |
| parent | 09041daeea467090f57507473a3ec8ec0e68be6d (diff) | |
| parent | 96f15efcea94545987715f453a8c2b8ea592d000 (diff) | |
Merge branch 'bugzilla-13041' into release
Diffstat (limited to 'drivers/acpi/sleep.c')
| -rw-r--r-- | drivers/acpi/sleep.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c index d060e6fd7fd5..01574a066534 100644 --- a/drivers/acpi/sleep.c +++ b/drivers/acpi/sleep.c @@ -713,6 +713,32 @@ static void acpi_power_off(void) acpi_enter_sleep_state(ACPI_STATE_S5); } +/* + * ACPI 2.0 created the optional _GTS and _BFS, + * but industry adoption has been neither rapid nor broad. + * + * Linux gets into trouble when it executes poorly validated + * paths through the BIOS, so disable _GTS and _BFS by default, + * but do speak up and offer the option to enable them. + */ +void __init acpi_gts_bfs_check(void) +{ + acpi_handle dummy; + + if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy))) + { + printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n"); + printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, " + "please notify linux-acpi@vger.kernel.org\n"); + } + if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy))) + { + printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n"); + printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, " + "please notify linux-acpi@vger.kernel.org\n"); + } +} + int __init acpi_sleep_init(void) { acpi_status status; @@ -771,5 +797,6 @@ int __init acpi_sleep_init(void) * object can also be evaluated when the system enters S5. */ register_reboot_notifier(&tts_notifier); + acpi_gts_bfs_check(); return 0; } |