fixeria has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-bts/+/38420?usp=email )

Change subject: rsl: rsl_handle_chan_mod_ie(): set lchan->csd_mode for NT CSD ......................................................................

rsl: rsl_handle_chan_mod_ie(): set lchan->csd_mode for NT CSD

In commit 66eae187, I skipped assigning LCHAN_CSD_M_NT (0) to lchan->csd_mode for non-transparent channel modes. I assumed that the entire gsm_lchan struct was zero-initialized during activation or release procedures, but this assumption was incorrect.

In fact, some lchan fields are initialized during activation, while others are initialized during release. Specifically, lchan->csd_mode is zero-initialized when the process starts, and then updated only for transparent mode requests. For non-transparent mode requests, this field is not updated, meaning it retains its previous value.

This bug caused incorrect E1/E2/E3 bit settings and missing GSMTAP RLP output for channels that were previously used for transparent CSD calls. This patch is fixing it.

Change-Id: I793ab4dc25fa852eade6f7a3b67ae961ceb7a093 Fixes: 66eae187 "rsl: rsl_handle_chan_mod_ie(): set lchan->csd_mode" Related: OS#1572, OS#6579 --- M src/common/rsl.c 1 file changed, 11 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/20/38420/1

diff --git a/src/common/rsl.c b/src/common/rsl.c index cc802c8..20581d4 100644 --- a/src/common/rsl.c +++ b/src/common/rsl.c @@ -205,37 +205,48 @@ /* If octet 4 indicates non-transparent data */ case RSL_CMODE(RSL_CMOD_SPD_DATA, RSL_CMOD_CSD_NT_14k5): lchan->tch_mode = GSM48_CMODE_DATA_14k5; + lchan->csd_mode = LCHAN_CSD_M_NT; break; case RSL_CMODE(RSL_CMOD_SPD_DATA, RSL_CMOD_CSD_NT_12k0): lchan->tch_mode = GSM48_CMODE_DATA_12k0; + lchan->csd_mode = LCHAN_CSD_M_NT; break; case RSL_CMODE(RSL_CMOD_SPD_DATA, RSL_CMOD_CSD_NT_6k0): lchan->tch_mode = GSM48_CMODE_DATA_6k0; + lchan->csd_mode = LCHAN_CSD_M_NT; break; case RSL_CMODE(RSL_CMOD_SPD_DATA, RSL_CMOD_CSD_NT_43k5): lchan->tch_mode = GSM48_CMODE_DATA_43k5; + lchan->csd_mode = LCHAN_CSD_M_NT; break; case RSL_CMODE(RSL_CMOD_SPD_DATA, RSL_CMOD_CSD_NT_28k8): /* 28.8 kbit/s services, 29.0 kbit/s radio interface rate */ lchan->tch_mode = GSM48_CMODE_DATA_29k0; + lchan->csd_mode = LCHAN_CSD_M_NT; break; case RSL_CMODE(RSL_CMOD_SPD_DATA, RSL_CMOD_CSD_NTA_43k5_14k5): lchan->tch_mode = GSM48_CMODE_DATA_43k5_14k5; + lchan->csd_mode = LCHAN_CSD_M_NT; break; case RSL_CMODE(RSL_CMOD_SPD_DATA, RSL_CMOD_CSD_NTA_29k0_14k5): lchan->tch_mode = GSM48_CMODE_DATA_29k0_14k5; + lchan->csd_mode = LCHAN_CSD_M_NT; break; case RSL_CMODE(RSL_CMOD_SPD_DATA, RSL_CMOD_CSD_NTA_43k5_29k0): lchan->tch_mode = GSM48_CMODE_DATA_43k5_29k0; + lchan->csd_mode = LCHAN_CSD_M_NT; break; case RSL_CMODE(RSL_CMOD_SPD_DATA, RSL_CMOD_CSD_NTA_14k5_43k5): lchan->tch_mode = GSM48_CMODE_DATA_14k5_43k5; + lchan->csd_mode = LCHAN_CSD_M_NT; break; case RSL_CMODE(RSL_CMOD_SPD_DATA, RSL_CMOD_CSD_NTA_14k5_29k0): lchan->tch_mode = GSM48_CMODE_DATA_14k5_29k0; + lchan->csd_mode = LCHAN_CSD_M_NT; break; case RSL_CMODE(RSL_CMOD_SPD_DATA, RSL_CMOD_CSD_NTA_29k0_43k5): lchan->tch_mode = GSM48_CMODE_DATA_29k0_43k5; + lchan->csd_mode = LCHAN_CSD_M_NT; break;

/* If octet 4 indicates transparent data */