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epdg_diameter_swm: Update PID if session already exists

If the FSM was recreated, during the first step it may have a different
PID. Update it so that we send the answer back to the proper PID.

Change-Id: I5e4f0ff4292c364f47d61ba629df50e8e3d35017
---
M src/epdg_diameter_swm.erl
1 file changed, 22 insertions(+), 2 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/erlang/osmo-epdg refs/changes/95/35895/1

diff --git a/src/epdg_diameter_swm.erl b/src/epdg_diameter_swm.erl
index 57c0921..800df44 100644
--- a/src/epdg_diameter_swm.erl
+++ b/src/epdg_diameter_swm.erl
@@ -181,7 +181,15 @@
 	Sess = find_swm_session_by_imsi(Imsi, State),
 	case Sess of
 		#swm_session{imsi = Imsi} ->
-		{Sess, State};
+		% Update Pid since it may have changed:
+		Sess1 = Sess#swm_session{pid = Pid},
+		State1 = update_swm_session(Sess, Sess1, State),
+		{Sess1, State1};
 		undefined ->
 		new_swm_session(Imsi, Pid, State)
-	end.
\ No newline at end of file
+	end.
+
+update_swm_session(OldSess, NewSess, State) ->
+	SetRemoved = sets:del_element(OldSess, State#swm_state.sessions),
+	SetUpdated = sets:add_element(NewSess, SetRemoved),
+	State#swm_state{sessions = SetUpdated}.

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