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jolly uploaded patch set #2 to this change.

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Handle empty (idle) PDCH blocks gracefully

An empty PDCH block contains no payload, sysmo-bts and similar BTS
models crash, because they expect the msg->l2h to be set. The function
l1sap_pdch_req() will not set msg->l2h for empty PDCH blocks, so these
models crash.

The current osmo-pcu does not send empty PDCH blocks to these BTS
models. But there shouldn't be a crash, if we receive empty PDCH blocks
over the PCU socket interface.

Change-Id: Icb52c896766425fcf453c65530c4c0b8d06b8821
---
M src/osmo-bts-lc15/l1_if.c
M src/osmo-bts-oc2g/l1_if.c
M src/osmo-bts-octphy/l1_if.c
M src/osmo-bts-sysmo/l1_if.c
4 files changed, 22 insertions(+), 4 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/70/35270/2

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