From c81da66608d65dab04730582dfdfcdcab779e2fe Mon Sep 17 00:00:00 2001 From: Bob Moore Date: Fri, 2 Feb 2007 19:48:18 +0300 Subject: ACPICA: Delete recursive feature of ACPI Global Lock Completed a new design and implementation for the ACPI Global Lock support. On the OS side, the global lock is now treated as a standard AML mutex. Previously, multiple OS threads could acquire the global lock simultaneously, but this could cause the BIOS to be starved by the lock in cases such as the Embedded Controller driver, where there is a tight coupling between the OS and the BIOS. Signed-off-by: Alexey Starikovskiy Signed-off-by: Len Brown --- drivers/acpi/utilities/utdelete.c | 14 +++++++++----- drivers/acpi/utilities/utglobal.c | 2 +- 2 files changed, 10 insertions(+), 6 deletions(-) (limited to 'drivers/acpi/utilities') diff --git a/drivers/acpi/utilities/utdelete.c b/drivers/acpi/utilities/utdelete.c index 9d3f1149ba21..af8e65f17fb7 100644 --- a/drivers/acpi/utilities/utdelete.c +++ b/drivers/acpi/utilities/utdelete.c @@ -158,16 +158,20 @@ static void acpi_ut_delete_internal_obj(union acpi_operand_object *object) "***** Mutex %p, OS Mutex %p\n", object, object->mutex.os_mutex)); - if (object->mutex.os_mutex != ACPI_GLOBAL_LOCK) { - acpi_ex_unlink_mutex(object); - acpi_os_delete_mutex(object->mutex.os_mutex); - } else { - /* Global Lock "mutex" is actually a counting semaphore */ + if (object->mutex.os_mutex == acpi_gbl_global_lock_mutex) { + + /* Global Lock has extra semaphore */ (void) acpi_os_delete_semaphore (acpi_gbl_global_lock_semaphore); acpi_gbl_global_lock_semaphore = NULL; + + acpi_os_delete_mutex(object->mutex.os_mutex); + acpi_gbl_global_lock_mutex = NULL; + } else { + acpi_ex_unlink_mutex(object); + acpi_os_delete_mutex(object->mutex.os_mutex); } break; diff --git a/drivers/acpi/utilities/utglobal.c b/drivers/acpi/utilities/utglobal.c index 014030af8b50..103845213e22 100644 --- a/drivers/acpi/utilities/utglobal.c +++ b/drivers/acpi/utilities/utglobal.c @@ -795,8 +795,8 @@ void acpi_ut_init_globals(void) /* Global Lock support */ acpi_gbl_global_lock_semaphore = NULL; + acpi_gbl_global_lock_mutex = NULL; acpi_gbl_global_lock_acquired = FALSE; - acpi_gbl_global_lock_thread_count = 0; acpi_gbl_global_lock_handle = 0; /* Miscellaneous variables */ -- cgit v1.2.3