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Commit b678320c authored by Irfan Sheriff's avatar Irfan Sheriff
Browse files

Recover immediately from driver hang 

A firmware crash can now put the interface down without notifiying the framework.
We detect this and recover immediately.

Bug: 6263857
Change-Id: Ib2dc0412fcdf9ce7b90a7fc0fab778f7af9c0513
parent e2639d78

wifi/java/android/net/wifi/WifiStateMachine.java

+4 −4
Original line number Diff line number Diff line
@@ -2814,15 +2814,15 @@ public class WifiStateMachine extends StateMachine { 
                    break;

                case WifiMonitor.SUPPLICANT_STATE_CHANGE_EVENT:

                    SupplicantState state = handleSupplicantStateChange(message);

                    // Due to a WEXT bug, during the time of driver start/stop

                    // we can go into a driver stopped state in an unexpected way.

                    // The sequence eventually puts interface

                    // up and we should be back to a connected state

                    // A driver/firmware hang can now put the interface in a down state.

                    // We detect the interface going down and recover from it

                    if (!SupplicantState.isDriverActive(state)) {

                        if (mNetworkInfo.getState() != NetworkInfo.State.DISCONNECTED) {

                            handleNetworkDisconnect();

                        }

                        log("Detected an interface down, restart driver");

                        transitionTo(mDriverStoppedState);

                        sendMessage(CMD_START_DRIVER);

                        break;

                    }