Merged revisions 128795 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
r128795 | russell | 2008-07-07 17:41:48 -0500 (Mon, 07 Jul 2008) | 8 lines

Fix handling of when a pvt disappears.  Properly return the pvt locked
and don't hold the pvt lock while destroying the ast_channel.

(closes issue #13014)
Reported by: jpgrayson
Patches:
      chan_iax2_ast_iax2_new2.patch uploaded by jpgrayson (license 492)

........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@128796 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_iax2.c

@@ -4091,11 +4091,13 @@ static struct ast_channel *ast_iax2_new(int callno, int state, int capability)
 	ast_mutex_unlock(&iaxsl[callno]);
 	tmp = ast_channel_alloc(1, state, i->cid_num, i->cid_name, i->accountcode, i->exten, i->context, i->amaflags, "IAX2/%s-%d", i->host, i->callno);
 	ast_mutex_lock(&iaxsl[callno]);
-	if (!iaxs[callno]) {
+	if (i != iaxs[callno]) {
 		if (tmp) {
+			/* unlock and relock iaxsl[callno] to preserve locking order */
+			ast_mutex_unlock(&iaxsl[callno]);
 			ast_channel_free(tmp);
+			ast_mutex_lock(&iaxsl[callno]);
 		}
-		ast_mutex_unlock(&iaxsl[callno]);
 		return NULL;
 	}
 	iax2_ami_channelupdate(i);