2 files changed, 28 insertions, 9 deletions

diff --git a/drivers/acpi/events/evmisc.c b/drivers/acpi/events/evmisc.c
index 21cb749d0c75..2d34663dc1ed 100644
--- a/drivers/acpi/events/evmisc.c
+++ b/drivers/acpi/events/evmisc.c
@@ -439,7 +439,8 @@ acpi_status acpi_ev_acquire_global_lock(u16 timeout)
          * Only one thread can acquire the GL at a time, the global_lock_mutex
          * enforces this. This interface releases the interpreter if we must wait.
          */
-        status = acpi_ex_system_wait_mutex(acpi_gbl_global_lock_mutex, 0);
+        status = acpi_ex_system_wait_mutex(
+                        acpi_gbl_global_lock_mutex->mutex.os_mutex, 0);
         if (status == AE_TIME) {
                 if (acpi_ev_global_lock_thread_id == acpi_os_get_thread_id()) {
                         acpi_ev_global_lock_acquired++;
@@ -448,9 +449,9 @@ acpi_status acpi_ev_acquire_global_lock(u16 timeout)
         }
 
         if (ACPI_FAILURE(status)) {
-                status =
-                    acpi_ex_system_wait_mutex(acpi_gbl_global_lock_mutex,
-                                              timeout);
+                status = acpi_ex_system_wait_mutex(
+                                acpi_gbl_global_lock_mutex->mutex.os_mutex,
+                                timeout);
         }
         if (ACPI_FAILURE(status)) {
                 return_ACPI_STATUS(status);
@@ -555,7 +556,7 @@ acpi_status acpi_ev_release_global_lock(void)
         /* Release the local GL mutex */
         acpi_ev_global_lock_thread_id = NULL;
         acpi_ev_global_lock_acquired = 0;
-        acpi_os_release_mutex(acpi_gbl_global_lock_mutex);
+        acpi_os_release_mutex(acpi_gbl_global_lock_mutex->mutex.os_mutex);
         return_ACPI_STATUS(status);
 }
 
diff --git a/drivers/acpi/events/evxface.c b/drivers/acpi/events/evxface.c
index 6d866a01f5f4..dbf34a5fc1e0 100644
--- a/drivers/acpi/events/evxface.c
+++ b/drivers/acpi/events/evxface.c
@@ -758,6 +758,12 @@ ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)
  *
  * DESCRIPTION: Acquire the ACPI Global Lock
  *
+ * Note: Allows callers with the same thread ID to acquire the global lock
+ * multiple times. In other words, externally, the behavior of the global lock
+ * is identical to an AML mutex. On the first acquire, a new handle is
+ * returned. On any subsequent calls to acquire by the same thread, the same
+ * handle is returned.
+ *
  ******************************************************************************/
 acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle)
 {
@@ -770,14 +776,26 @@ acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle)
         /* Must lock interpreter to prevent race conditions */
 
         acpi_ex_enter_interpreter();
-        status = acpi_ev_acquire_global_lock(timeout);
-        acpi_ex_exit_interpreter();
+
+        status = acpi_ex_acquire_mutex_object(timeout,
+                                              acpi_gbl_global_lock_mutex,
+                                              acpi_os_get_thread_id());
 
         if (ACPI_SUCCESS(status)) {
-                acpi_gbl_global_lock_handle++;
+                /*
+                 * 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 */
+
                 *handle = acpi_gbl_global_lock_handle;
         }
 
+        acpi_ex_exit_interpreter();
         return (status);
 }
 
@@ -802,7 +820,7 @@ acpi_status acpi_release_global_lock(u32 handle)
                 return (AE_NOT_ACQUIRED);
         }
 
-        status = acpi_ev_release_global_lock();
+        status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
         return (status);
 }