when channel allocator operates in reverse order, prefer SDCCH/8 over SDCCH/4
diff --git a/openbsc/src/chan_alloc.c b/openbsc/src/chan_alloc.c
index 0cf567f..48c728c 100644
--- a/openbsc/src/chan_alloc.c
+++ b/openbsc/src/chan_alloc.c
@@ -182,12 +182,21 @@
struct gsm_lchan *lchan_alloc(struct gsm_bts *bts, enum gsm_chan_t type)
{
struct gsm_lchan *lchan = NULL;
+ enum gsm_phys_chan_config first, second;
switch (type) {
case GSM_LCHAN_SDCCH:
- lchan = _lc_find_bts(bts, GSM_PCHAN_CCCH_SDCCH4);
+ if (bts->chan_alloc_reverse) {
+ first = GSM_PCHAN_SDCCH8_SACCH8C;
+ second = GSM_PCHAN_CCCH_SDCCH4;
+ } else {
+ first = GSM_PCHAN_CCCH_SDCCH4;
+ second = GSM_PCHAN_SDCCH8_SACCH8C;
+ }
+
+ lchan = _lc_find_bts(bts, first);
if (lchan == NULL)
- lchan = _lc_find_bts(bts, GSM_PCHAN_SDCCH8_SACCH8C);
+ lchan = _lc_find_bts(bts, second);
break;
case GSM_LCHAN_TCH_F:
lchan = _lc_find_bts(bts, GSM_PCHAN_TCH_F);