[rtems commit] smp: Protect decrement operation

[Sebastian Huber]

Module:    rtems
Branch:    master
Commit:    df244cfc300029d943a5c54b22d28b85c38d2ae0
Changeset: http://git.rtems.org/rtems/commit/?id=df244cfc300029d943a5c54b22d28b85c38d2ae0

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Wed Jun 12 09:16:30 2013 +0200

smp: Protect decrement operation

---

 cpukit/score/src/threaddispatchdisablelevel.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/cpukit/score/src/threaddispatchdisablelevel.c b/cpukit/score/src/threaddispatchdisablelevel.c
index ee1bfeb..4686795 100644
--- a/cpukit/score/src/threaddispatchdisablelevel.c
+++ b/cpukit/score/src/threaddispatchdisablelevel.c
@@ -88,16 +88,16 @@ uint32_t _Thread_Dispatch_decrement_disable_level( void )
 
   _ISR_Disable_on_this_core( isr_level );
 
+  disable_level = _Thread_Dispatch_disable_level;
+  --disable_level;
+  _Thread_Dispatch_disable_level = disable_level;
+
   --level_lock->nest_level;
   if ( level_lock->nest_level == 0 ) {
     level_lock->owner_cpu = NO_OWNER_CPU;
     _SMP_lock_Release( &level_lock->lock );
   }
 
-  disable_level = _Thread_Dispatch_disable_level;
-  --disable_level;
-  _Thread_Dispatch_disable_level = disable_level;
-
   _ISR_Enable_on_this_core( isr_level );
 
   return disable_level;