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>

2 files changed, 14 insertions, 8 deletions

diff --git a/drivers/acpi/events/evmisc.c b/drivers/acpi/events/evmisc.c
index 2d34663..d075062 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 e210aa2..412cae6 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;
 	}