Supsend/resume batched scans around dhcp.

Scanning while dhcp is running breaks dhcp, so stop the batched scans
when we need dhcp and start it up again after.

bug:10691401
Change-Id: Ifdeb6f35cfe4509b90fed1e1e694d0c107f24a7e

1 files changed, 30 insertions, 3 deletions

diff --git a/wifi/java/android/net/wifi/WifiStateMachine.java b/wifi/java/android/net/wifi/WifiStateMachine.java
index 0f1aa71..33a67ca 100644
--- a/wifi/java/android/net/wifi/WifiStateMachine.java
+++ b/wifi/java/android/net/wifi/WifiStateMachine.java
@@ -228,6 +228,7 @@ public class WifiStateMachine extends StateMachine {
     private NetworkInfo mNetworkInfo;
     private SupplicantStateTracker mSupplicantStateTracker;
     private DhcpStateMachine mDhcpStateMachine;
+    private boolean mDhcpActive = false;
 
     private class InterfaceObserver extends BaseNetworkObserver {
         private WifiStateMachine mWifiStateMachine;
@@ -848,6 +849,11 @@ public class WifiStateMachine extends StateMachine {
     }
 
     private void startBatchedScan() {
+        if (mDhcpActive) {
+            if (DBG) log("not starting Batched Scans due to DHCP");
+            return;
+        }
+
         // first grab any existing data
         retrieveBatchedScanData();
 
@@ -915,8 +921,10 @@ public class WifiStateMachine extends StateMachine {
 
     private void stopBatchedScan() {
         mAlarmManager.cancel(mBatchedScanIntervalIntent);
-        retrieveBatchedScanData();
-        mWifiNative.setBatchedScanSettings(null);
+        if (mBatchedScanSettings != null) {
+            retrieveBatchedScanData();
+            mWifiNative.setBatchedScanSettings(null);
+        }
     }
 
     private void setNextBatchedAlarm(int scansExpected) {
@@ -2201,6 +2209,7 @@ public class WifiStateMachine extends StateMachine {
     }
 
     void handlePreDhcpSetup() {
+        mDhcpActive = true;
         if (!mBluetoothConnectionActive) {
             /*
              * There are problems setting the Wi-Fi driver's power
@@ -2230,6 +2239,8 @@ public class WifiStateMachine extends StateMachine {
         setSuspendOptimizationsNative(SUSPEND_DUE_TO_DHCP, false);
         mWifiNative.setPowerSave(false);
 
+        stopBatchedScan();
+
         /* P2p discovery breaks dhcp, shut it down in order to get through this */
         Message msg = new Message();
         msg.what = WifiP2pService.BLOCK_DISCOVERY;
@@ -2268,6 +2279,12 @@ public class WifiStateMachine extends StateMachine {
         // Set the coexistence mode back to its default value
         mWifiNative.setBluetoothCoexistenceMode(
                 mWifiNative.BLUETOOTH_COEXISTENCE_MODE_SENSE);
+
+        mDhcpActive = false;
+
+        if (mBatchedScanSettings != null) {
+            startBatchedScan();
+        }
     }
 
     private void handleSuccessfulIpConfiguration(DhcpResults dhcpResults) {
@@ -2915,6 +2932,8 @@ public class WifiStateMachine extends StateMachine {
                 mWifiNative.stopFilteringMulticastV4Packets();
             }
 
+            mDhcpActive = false;
+
             if (mBatchedScanSettings != null) {
                 startBatchedScan();
             }
@@ -3484,6 +3503,14 @@ public class WifiStateMachine extends StateMachine {
         }
 
         @Override
+        public void exit() {
+            // if we're leaving before this is done, cleanup
+            if (mDhcpActive) {
+                handlePostDhcpSetup();
+            }
+        }
+
+        @Override
         public boolean processMessage(Message message) {
             switch (message.what) {
               case DhcpStateMachine.CMD_PRE_DHCP_ACTION:
@@ -3675,7 +3702,7 @@ public class WifiStateMachine extends StateMachine {
                     transitionTo(mCaptivePortalCheckState);
                     break;
                 default:
-                    log(getName() + " what=" + message.what + " NOT_HANDLED");
+                    if (DBG) log(getName() + " what=" + message.what + " NOT_HANDLED");
                     return NOT_HANDLED;
             }
             return HANDLED;