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rsl: rsl_rx_chan_activ(): set TA=0 if not indicated by the BSC

Otherwise the TA loop would end up using whatever value was set
previously.  Let's assume TA=0 if not indicated by the BSC.

Change-Id: I83f26ff06cebdfe8d4e75944f496e9678310e2a2
---
M src/common/rsl.c
1 file changed, 2 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/29/39829/1

diff --git a/src/common/rsl.c b/src/common/rsl.c
index 7931a17..1104ef8 100644
--- a/src/common/rsl.c
+++ b/src/common/rsl.c
@@ -2064,6 +2064,8 @@
 	/* 9.3.24 Timing Advance */
 	if (TLVP_PRES_LEN(&tp, RSL_IE_TIMING_ADVANCE, 1))
 		lchan->ta_ctrl.current = *TLVP_VAL(&tp, RSL_IE_TIMING_ADVANCE);
+	else /* assume TA=0 if not indicated by the BSC */
+		lchan->ta_ctrl.current = 0;
 
 	/* 9.3.31 (TLV) MS Power Parameters IE (vendor specific) */
 	if ((ie = TLVP_GET(&tp, RSL_IE_MS_POWER_PARAM)) != NULL) {

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