diff options
| author | Bob Moore <robert.moore@intel.com> | 2008-04-10 19:06:38 +0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2008-04-22 14:29:23 -0400 |
| commit | e5567afa5cfa19e45f93c9c8796e46187a2d12f4 (patch) | |
| tree | ab02e06e8a7aad960b1188b5211c1ed9d3631cf0 | |
| parent | 235eebbdb501261e9960deb2a9a3459af44ec0ea (diff) | |
| download | linux-e5567afa5cfa19e45f93c9c8796e46187a2d12f4.tar.gz linux-e5567afa5cfa19e45f93c9c8796e46187a2d12f4.tar.bz2 linux-e5567afa5cfa19e45f93c9c8796e46187a2d12f4.zip | |
ACPICA: Fix for update of the Global Lock Handle
Fixed a problem where the global lock handle was not properly
updated if a thread that acquired the global lock via
executing AML code then attempted to acquire the lock via the
AcpiAcquireGlobalLock interface.
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
| -rw-r--r-- | drivers/acpi/events/evmisc.c | 13 | ||||
| -rw-r--r-- | drivers/acpi/events/evxface.c | 9 |
2 files changed, 14 insertions, 8 deletions
diff --git a/drivers/acpi/events/evmisc.c b/drivers/acpi/events/evmisc.c index 2d34663dc1ed..d075062f5b89 100644 --- a/drivers/acpi/events/evmisc.c +++ b/drivers/acpi/events/evmisc.c @@ -461,6 +461,19 @@ acpi_status acpi_ev_acquire_global_lock(u16 timeout) acpi_ev_global_lock_acquired++; /* + * Update the global lock handle and check for wraparound. The handle is + * only used for the external global lock interfaces, but it is updated + * here to properly handle the case where a single thread may acquire the + * lock via both the AML and the acpi_acquire_global_lock interfaces. The + * handle is therefore updated on the first acquire from a given thread + * regardless of where the acquisition request originated. + */ + acpi_gbl_global_lock_handle++; + if (acpi_gbl_global_lock_handle == 0) { + acpi_gbl_global_lock_handle = 1; + } + + /* * Make sure that a global lock actually exists. If not, just treat * the lock as a standard mutex. */ diff --git a/drivers/acpi/events/evxface.c b/drivers/acpi/events/evxface.c index e210aa2d76da..412cae698311 100644 --- a/drivers/acpi/events/evxface.c +++ b/drivers/acpi/events/evxface.c @@ -782,15 +782,8 @@ acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle) acpi_os_get_thread_id()); if (ACPI_SUCCESS(status)) { - /* - * If this was the first acquisition of the Global Lock by this thread, - * create a new handle. Otherwise, return the existing handle. - */ - if (acpi_gbl_global_lock_mutex->mutex.acquisition_depth == 1) { - acpi_gbl_global_lock_handle++; - } - /* Return the global lock handle */ + /* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */ *handle = acpi_gbl_global_lock_handle; } |