[rsl] Introduce an error state for the lchan and set it on release
When we issue a RF Channel Release in case of a failure we receive
RLL release indications after the channel was tearn down and we
issue another RF Channel Release as a result. The channel allocator
might have already allocated this channel and we release the channel
again with another MS on it.
Make rsl_rf_chan_release take an error argument and make it set
a new state in case of an error and change the RF Channel Release
ack to not set the state back to none in case of an error but wait
for a timeout that is a bit higher than T3111.
I tested this with removing the battery during a phonecall and
waiting for the channel failure. With this test we only send the
release once.
diff --git a/openbsc/src/gsm_data.c b/openbsc/src/gsm_data.c
index a10edad..9de4c1f 100644
--- a/openbsc/src/gsm_data.c
+++ b/openbsc/src/gsm_data.c
@@ -88,6 +88,7 @@
{ LCHAN_S_ACTIVE, "ACTIVE" },
{ LCHAN_S_INACTIVE, "INACTIVE" },
{ LCHAN_S_REL_REQ, "RELEASE REQUESTED" },
+ { LCHAN_S_REL_ERR, "RELEASE DUE ERROR" },
{ 0, NULL }
};