Merged revisions 75059 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.2

........
r75059 | russell | 2007-07-13 15:07:21 -0500 (Fri, 13 Jul 2007) | 6 lines

Ensure that adding a user to the list of users of a specific music on hold
class is not done at the same time as any of the other operations on this list
to prevent list corruption.  Using the global moh_data lock for this is not
ideal, but it is what is used to protect these lists everywhere else in the
module, and I am only changing what is necessary to fix the bug.

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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@75067 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_musiconhold.c

@@ -665,7 +665,10 @@ static struct mohdata *mohalloc(struct mohclass *cl)
 	moh->f.offset = AST_FRIENDLY_OFFSET;
 
 	moh->parent = cl;
+
+	AST_LIST_LOCK(&mohclasses);
 	AST_LIST_INSERT_HEAD(&cl->members, moh, list);
+	AST_LIST_UNLOCK(&mohclasses);
 	
 	return moh;
 }