Release call lock while we look for the peer to avoid a deadlock

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/v1-0@4384 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CHANGES

@@ -7,6 +7,8 @@
     -- fix bug with supervised transfers
  -- chan_h323
     -- fix compilation problem
+ -- chan_iax2
+   -- avoid a deadlock related to a static config of a BUNCH of peers
  -- cdr_pgsql
     -- fix memory leak when reading config
  -- Numerous other minor bug fixes

channels/chan_iax2.c

@@ -3852,12 +3852,15 @@ static int register_verify(int callno, struct sockaddr_in *sin, struct iax_ies *
 		ast_log(LOG_NOTICE, "Empty registration from %s\n", ast_inet_ntoa(iabuf, sizeof(iabuf), sin->sin_addr));
 		return -1;
 	}
-
+	/* We release the lock for the call to prevent a deadlock, but it's okay because
+	   only the current thread could possibly make it go away or make changes */
+	ast_mutex_unlock(&iaxsl[callno]);
 	ast_mutex_lock(&peerl.lock);
 	for (p = peerl.peers; p ; p = p->next) 
 		if (!strcasecmp(p->name, peer))
 			break;
 	ast_mutex_unlock(&peerl.lock);
+	ast_mutex_lock(&iaxsl[callno]);
 #ifdef MYSQL_FRIENDS
 	if (!p) 
 		p = mysql_peer(peer);