ACPICA: Move check for valid Thread ID structure

This change moves the check for a valid Thread ID structure up a
few lines to insure that the check is made before the structure
is actually used.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 9 insertions, 9 deletions

diff --git a/drivers/acpi/acpica/exmutex.c b/drivers/acpi/acpica/exmutex.c
index 2f0114202b05..3c456bd575d0 100644
--- a/drivers/acpi/acpica/exmutex.c
+++ b/drivers/acpi/acpica/exmutex.c
@@ -375,6 +375,15 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
                 return_ACPI_STATUS(AE_AML_MUTEX_NOT_ACQUIRED);
         }
 
+        /* Must have a valid thread ID */
+
+        if (!walk_state->thread) {
+                ACPI_ERROR((AE_INFO,
+                            "Cannot release Mutex [%4.4s], null thread info",
+                            acpi_ut_get_node_name(obj_desc->mutex.node)));
+                return_ACPI_STATUS(AE_AML_INTERNAL);
+        }
+
         /*
          * The Mutex is owned, but this thread must be the owner.
          * Special case for Global Lock, any thread can release
@@ -392,15 +401,6 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
                 return_ACPI_STATUS(AE_AML_NOT_OWNER);
         }
 
-        /* Must have a valid thread ID */
-
-        if (!walk_state->thread) {
-                ACPI_ERROR((AE_INFO,
-                            "Cannot release Mutex [%4.4s], null thread info",
-                            acpi_ut_get_node_name(obj_desc->mutex.node)));
-                return_ACPI_STATUS(AE_AML_INTERNAL);
-        }
-
         /*
          * The sync level of the mutex must be equal to the current sync level. In
          * other words, the current level means that at least one mutex at that