diff options
| author | Bob Moore <robert.moore@intel.com> | 2013-04-12 00:25:41 +0000 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-04-12 13:29:48 +0200 |
| commit | 58892c962a0f8b7187b036e787223365864bde3f (patch) | |
| tree | fcf84c2f3f4152331aa0536e0819f3067fa3b369 /drivers/acpi/acpica/utmutex.c | |
| parent | 475df486f5191ce0671b99aff029b38bff7a72f1 (diff) | |
| download | linux-58892c962a0f8b7187b036e787223365864bde3f.tar.bz2 | |
ACPICA: Add a lock to the internal object reference count mechanism
Certain external interfaces need to update object references
without holding the interpreter or namespace mutex objects. To
prevent race conditions, add a spinlock around the increment
and decrement of the reference counts for internal ACPI
objects. Reported by Andriy Gapon (avg@FreeBSD.org).
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Andriy Gapon <avg@FreeBSD.org>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpica/utmutex.c')
| -rw-r--r-- | drivers/acpi/acpica/utmutex.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/acpi/acpica/utmutex.c b/drivers/acpi/acpica/utmutex.c index 22feb99b8e35..08c323245584 100644 --- a/drivers/acpi/acpica/utmutex.c +++ b/drivers/acpi/acpica/utmutex.c @@ -81,7 +81,7 @@ acpi_status acpi_ut_mutex_initialize(void) } } - /* Create the spinlocks for use at interrupt level */ + /* Create the spinlocks for use at interrupt level or for speed */ status = acpi_os_create_lock (&acpi_gbl_gpe_lock); if (ACPI_FAILURE (status)) { @@ -93,7 +93,13 @@ acpi_status acpi_ut_mutex_initialize(void) return_ACPI_STATUS (status); } + status = acpi_os_create_lock(&acpi_gbl_reference_count_lock); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + /* Mutex for _OSI support */ + status = acpi_os_create_mutex(&acpi_gbl_osi_mutex); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); @@ -136,6 +142,7 @@ void acpi_ut_mutex_terminate(void) acpi_os_delete_lock(acpi_gbl_gpe_lock); acpi_os_delete_lock(acpi_gbl_hardware_lock); + acpi_os_delete_lock(acpi_gbl_reference_count_lock); /* Delete the reader/writer lock */ |