rlcmac: Ignore DATA.ind with len=0

Change-Id: I342c7999261832a5d981e5831e428d2cbd82729e
---
M src/rlcmac/rlcmac_prim.c
1 file changed, 17 insertions(+), 1 deletion(-)


git pull ssh://gerrit.osmocom.org:29418/libosmo-gprs refs/changes/32/31732/1

diff --git a/src/rlcmac/rlcmac_prim.c b/src/rlcmac/rlcmac_prim.c
index dcf4424..3b5f003 100644
--- a/src/rlcmac/rlcmac_prim.c
+++ b/src/rlcmac/rlcmac_prim.c
@@ -467,8 +467,15 @@
 
 static int rlcmac_prim_handle_l1ctl_pdch_data_ind(struct osmo_gprs_rlcmac_prim *rlcmac_prim)
 {
-	enum gprs_rlcmac_coding_scheme cs = gprs_rlcmac_mcs_get_by_size_dl(rlcmac_prim->l1ctl.pdch_data_ind.data_len);
+	enum gprs_rlcmac_coding_scheme cs;
 
+	/* ignore empty DATA.ind */
+	if (rlcmac_prim->l1ctl.pdch_data_ind.data_len == 0) {
+		LOGRLCMAC(LOGL_DEBUG, "Dropping DL data block with length 0\n");
+		return 0;
+	}
+
+	cs = gprs_rlcmac_mcs_get_by_size_dl(rlcmac_prim->l1ctl.pdch_data_ind.data_len);
 	if (cs == GPRS_RLCMAC_CS_UNKNOWN) {
 		LOGRLCMAC(LOGL_ERROR, "Dropping DL data block with invalid length %u: %s\n",
 			  rlcmac_prim->l1ctl.pdch_data_ind.data_len,

