Camera2: Fix parallel session and device close() exception

It's possible for the device to have close() called on it
during the session close sequence such that the session still
tries to do a stream reconfiguration on the closed device.

Handle the exception thrown by this attempt.

Bug: 17661765

Change-Id: Iee63c5c559405abe5c044ae251ad56edd1fb3e79

core/java/android/hardware/camera2/impl/CameraCaptureSessionImpl.java

@@ -657,9 +657,9 @@ public class CameraCaptureSessionImpl extends CameraCaptureSession {
                     }
 
                     // Slow path: #close was called explicitly on this session; unconfigure first
+                    mUnconfigureDrainer.taskStarted();
 
                     try {
-                        mUnconfigureDrainer.taskStarted();
                         mDeviceImpl
                                 .configureOutputsChecked(null); // begin transition to unconfigured
                     } catch (CameraAccessException e) {
@@ -667,6 +667,11 @@ public class CameraCaptureSessionImpl extends CameraCaptureSession {
                         Log.e(TAG, mIdString + "Exception while configuring outputs: ", e);
 
                         // TODO: call onError instead of onClosed if this happens
+                    } catch (IllegalStateException e) {
+                        // Camera is already closed, so go straight to the close callback
+                        if (VERBOSE) Log.v(TAG, mIdString +
+                                "Camera was already closed or busy, skipping unconfigure");
+                        mUnconfigureDrainer.taskFinished();
                     }
 
                     mUnconfigureDrainer.beginDrain();