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>

diff --git a/drivers/acpi/acpica/exmutex.c b/drivers/acpi/acpica/exmutex.c
index 2f01142..3c456bd 100644 (file)
--- 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