Merged revisions 169869 via svnmerge from

https://origsvn.digium.com/svn/asterisk/trunk

................
  r169869 | file | 2009-01-21 19:25:27 -0400 (Wed, 21 Jan 2009) | 11 lines
  
  Merged revisions 169867 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.4
  
  ........
    r169867 | file | 2009-01-21 19:20:47 -0400 (Wed, 21 Jan 2009) | 4 lines
    
    Read lock the contexts to maintain the locking order when we are notified that the state of a device has changed.
    (closes issue #13839)
    Reported by: mcallist
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.0@169870 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/pbx.c

@@ -3267,6 +3267,7 @@ static void handle_statechange(const char *device)
 {
 	struct ast_hint *hint;
 
+	ast_rdlock_contexts();
 	AST_RWLIST_RDLOCK(&hints);
 
 	AST_RWLIST_TRAVERSE(&hints, hint, list) {
@@ -3304,6 +3305,7 @@ static void handle_statechange(const char *device)
 	}
 
 	AST_RWLIST_UNLOCK(&hints);
+	ast_unlock_contexts();
 }
 
 static int statechange_queue(const char *dev)