Cellular Network Infrastructure » Radio Access Network » OsmoPCU

Calling set_mode() for a given MS results in inconsistent settings:

• it's possible to set current DL MCS higher than max value
• EGPRS and EGPRS_GMSK have the same max DL MCS
• setting EGPRS* mode drops current/max MCS values to unknown

This should be fixed/documented and covered by unit tests. The incomplete implementation for the latter is available in https://gerrit.osmocom.org/c/osmo-pcu/+/13164 but it's not working properly yet due to ASAN bug cause by side effects in GprsMsStorage::ms_idle() which can delete MS which is triggered by GprsMs::detach_tbf() via GprsMs::update_status().