From b5a641d1fefb8ad96a9f4e2dd43cbe738c59ae12 Mon Sep 17 00:00:00 2001
From: Gregory Nietsky <gregory@distrotech.co.za>
Date: Fri, 16 Sep 2011 10:16:56 +0000
Subject: [PATCH] Merged revisions 336167 via svnmerge from
 https://origsvn.digium.com/svn/asterisk/branches/10

................
  r336167 | irroot | 2011-09-16 12:12:03 +0200 (Fri, 16 Sep 2011) | 22 lines

  Merged revisions 336166 via svnmerge from
  https://origsvn.digium.com/svn/asterisk/branches/1.8

  ........
    r336166 | irroot | 2011-09-16 12:09:17 +0200 (Fri, 16 Sep 2011) | 16 lines

    The round robin routing routine in chan_misdn.c is broken.

    it rotates between ports but never checks the channels in the ports.

    i have extensivly tested it and verified it works on 1 upto 4 ports.
    before the patch only 1 out of each port was used now all are used as
    expected.

    (closes issue ASTERISK-18413)
    Reported by: irroot
    Tested by: irroot
    Reviewed by: irroot

    Review: https://reviewboard.asterisk.org/r/1410/
  ........
................


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@336168 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
 channels/chan_misdn.c | 93 +++++++++++++++++++++----------------------
 1 file changed, 46 insertions(+), 47 deletions(-)

diff --git a/channels/chan_misdn.c b/channels/chan_misdn.c
index 79753e369a..9945b2c8f3 100644
--- a/channels/chan_misdn.c
+++ b/channels/chan_misdn.c
@@ -7886,64 +7886,63 @@ static struct ast_channel *misdn_request(const char *type, struct ast_format_cap
 		}
 
 		if (rr) {
-			int robin_channel = rr->channel;
 			int port_start;
-			int next_chan = 1;
+			int bchan_start;
+			int port_up;
+			int check;
+			int maxbchans;
 
-			do {
-				port_start = 0;
-				for (port = misdn_cfg_get_next_port_spin(rr->port); port > 0 && port != port_start;
-					 port = misdn_cfg_get_next_port_spin(port)) {
-
-					if (!port_start) {
-						port_start = port;
-					}
-
-					if (port >= port_start) {
-						next_chan = 1;
-					}
-
-					if (port <= port_start && next_chan) {
-						int maxbchans = misdn_lib_get_maxchans(port);
-
-						if (++robin_channel >= maxbchans) {
-							robin_channel = 1;
-						}
-						next_chan = 0;
-					}
+			if (!rr->port) {
+				rr->port = misdn_cfg_get_next_port_spin(0);
+			}
 
-					misdn_cfg_get(port, MISDN_CFG_GROUPNAME, cfg_group, sizeof(cfg_group));
+			if (!rr->channel) {
+				rr->channel = 1;
+			}
 
-					if (!strcasecmp(cfg_group, group)) {
-						int port_up;
-						int check;
+			bchan_start = rr->channel;
+			port_start = rr->port;
+			do {
+				misdn_cfg_get(rr->port, MISDN_CFG_GROUPNAME, cfg_group, sizeof(cfg_group));
+				if (strcasecmp(cfg_group, group)) {
+					rr->port = misdn_cfg_get_next_port_spin(rr->port);
+					rr->channel = 1;
+					continue;
+				}
 
-						misdn_cfg_get(port, MISDN_CFG_PMP_L1_CHECK, &check, sizeof(check));
-						port_up = misdn_lib_port_up(port, check);
+				misdn_cfg_get(rr->port, MISDN_CFG_PMP_L1_CHECK, &check, sizeof(check));
+				port_up = misdn_lib_port_up(rr->port, check);
 
-						if (check && !port_up) {
-							chan_misdn_log(1, port, "L1 is not Up on this Port\n");
-						}
+				if (!port_up) {
+					chan_misdn_log(1, rr->port, "L1 is not Up on this Port\n");
+					rr->port = misdn_cfg_get_next_port_spin(rr->port);
+					rr->channel = 1;
+				} else if (port_up < 0) {
+					ast_log(LOG_WARNING, "This port (%d) is blocked\n", rr->port);
+					rr->port = misdn_cfg_get_next_port_spin(rr->port);
+					rr->channel = 1;
+				} else {
+					chan_misdn_log(4, rr->port, "portup\n");
+					maxbchans = misdn_lib_get_maxchans(rr->port);
 
-						if (check && port_up < 0) {
-							ast_log(LOG_WARNING, "This port (%d) is blocked\n", port);
-						}
+					for (;rr->channel <= maxbchans;rr->channel++) {
+						chan_misdn_log(4, rr->port, "Checking channel %d\n",  rr->channel);
 
-						if (port_up > 0)	{
-							newbc = misdn_lib_get_free_bc(port, robin_channel, 0, 0);
-							if (newbc) {
-								chan_misdn_log(4, port, " Success! Found port:%d channel:%d\n", newbc->port, newbc->channel);
-								if (port_up) {
-									chan_misdn_log(4, port, "portup:%d\n",  port_up);
-								}
-								rr->port = newbc->port;
-								rr->channel = newbc->channel;
-								break;
-							}
+						if ((newbc = misdn_lib_get_free_bc(rr->port, rr->channel, 0, 0))) {
+							chan_misdn_log(4, rr->port, " Success! Found port:%d channel:%d\n", newbc->port, newbc->channel);
+							rr->channel++;
+							break;
 						}
 					}
+					if (!newbc || (rr->channel > maxbchans)) {
+						rr->port = misdn_cfg_get_next_port_spin(rr->port);
+						rr->channel = 1;
+					}
+
 				}
-			} while (!newbc && robin_channel != rr->channel);
+			} while (!newbc && (rr->port > 0) &&
+				 ((rr->port != port_start) || ((rr->port == port_start) && (rr->channel < bchan_start))));
+
 		} else {
 			for (port = misdn_cfg_get_next_port(0); port > 0;
 				port = misdn_cfg_get_next_port(port)) {