tree c7266118e9fd3bdc5afb86ea78168567aae0c6a8
parent 4d4368419427b04bb689f45840bab79e3dc04328
author Vadim Yanitskiy <vyanitskiy@sysmocom.de> 1599822236 +0700
committer Vadim Yanitskiy <vyanitskiy@sysmocom.de> 1599896841 +0700

radioDevice: fix set_antennas(): consider MULTI_ARFCN mode

In the multi-ARFCN mode, if the Tx/Rx antenna names are explicitly
set in 'chan N' sections of the configuration file:

  trx
   ...
   multi-arfcn disable
   chan 0
    tx-path TX/RX
    rx-path RX2
   chan 1
    tx-path TX/RX
    rx-path RX2
   chan 2
    tx-path TX/RX
    rx-path RX2

osmo-trx would crash, because radioDevice::set_antennas() would
attempt to configure antenna names for all N physical channels,
while USRP devices usually have 2 or even 1 available.

The easiest approach is to remove both 'tx-path'/'rx-path' from
all 'chan N' sections excluding 'chan 0', so it would work fine.
This makes sense, because in the multi-ARFCN mode we actually
use only one physical channel.

However, let's still make sure that explicit configuration of the
Tx/Rx antenna names would not crash osmo-trx and skip N > 0 in
radioDevice::set_antennas().

Change-Id: I09f316f181cbbc2214e8913b73f7c1fcea4e8c05
Related: OS#4636