From da0db0bd997c327b1279ba03cf1cea8cfd501044 Mon Sep 17 00:00:00 2001
From: Ethan Chen <intervigil@gmail.com>
Date: Fri, 16 Aug 2013 17:42:44 -0700
Subject: HTCQualcommRIL: fix data drops when switching state

* HTC RIL always throws this exception after the initial data call
  setup, so only switch ifname if the call goes from active to inactive.
* Prevents data drop due to empty address/DNS/gateway when radio tech
  switches to/from LTE/3G/2G.

Change-Id: I29107f549029d467ed01c0eba46561d65ca4d5d7
---
 .../android/internal/telephony/HTCQualcommRIL.java | 33 ++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/src/java/com/android/internal/telephony/HTCQualcommRIL.java b/src/java/com/android/internal/telephony/HTCQualcommRIL.java
index 5aa0416..dd29bec 100644
--- a/src/java/com/android/internal/telephony/HTCQualcommRIL.java
+++ b/src/java/com/android/internal/telephony/HTCQualcommRIL.java
@@ -48,6 +48,39 @@ public class HTCQualcommRIL extends RIL implements CommandsInterface {
     }
 
     @Override
+    protected DataCallState getDataCallState(Parcel p, int version) {
+        DataCallState dataCall = new DataCallState();
+
+        dataCall.version = version;
+        dataCall.status = p.readInt();
+        dataCall.suggestedRetryTime = p.readInt();
+        dataCall.cid = p.readInt();
+        dataCall.active = p.readInt();
+        dataCall.type = p.readString();
+        dataCall.ifname = p.readString();
+        /* Check dataCall.active != 0 so address, dns, gateways are provided
+         * when switching LTE<->3G<->2G */
+        if ((dataCall.status == DataConnection.FailCause.NONE.getErrorCode()) &&
+                TextUtils.isEmpty(dataCall.ifname) && dataCall.active != 0) {
+            throw new RuntimeException("getDataCallState, no ifname");
+        }
+        String addresses = p.readString();
+        if (!TextUtils.isEmpty(addresses)) {
+            dataCall.addresses = addresses.split(" ");
+        }
+        String dnses = p.readString();
+        if (!TextUtils.isEmpty(dnses)) {
+            dataCall.dnses = dnses.split(" ");
+        }
+        String gateways = p.readString();
+        if (!TextUtils.isEmpty(gateways)) {
+            dataCall.gateways = gateways.split(" ");
+        }
+
+        return dataCall;
+    }
+
+    @Override
     protected void
     processUnsolicited (Parcel p) {
         Object ret;
-- 
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