DRM Framework bug fixes.

- Make sure to clean-up obsolete listeners.
- Close cursor after using it.
- Add virtual destructor to the base class of OnInfoListener.

Changes are made by SEMC and Sony.

Change-Id: Ibb6dd625ef48e3597188f0d7c90f9d4c780b6139

drm/drmserver/DrmManager.cpp

@@ -117,7 +117,11 @@ status_t DrmManager::unloadPlugIns() {
 status_t DrmManager::setDrmServiceListener(
             int uniqueId, const sp<IDrmServiceListener>& drmServiceListener) {
     Mutex::Autolock _l(mLock);
+    if (NULL != drmServiceListener.get()) {
         mServiceListeners.add(uniqueId, drmServiceListener);
+    } else {
+        mServiceListeners.removeItem(uniqueId);
+    }
     return DRM_NO_ERROR;
 }
 

drm/libdrmframework/DrmManagerClient.cpp

@@ -31,6 +31,7 @@ DrmManagerClient::DrmManagerClient():
 DrmManagerClient::~DrmManagerClient() {
     DrmManagerClientImpl::remove(mUniqueId);
     mDrmManagerClientImpl->removeClient(mUniqueId);
+    mDrmManagerClientImpl->setOnInfoListener(mUniqueId, NULL);
     delete mDrmManagerClientImpl; mDrmManagerClientImpl = NULL;
 }
 

drm/libdrmframework/DrmManagerClientImpl.cpp

@@ -81,7 +81,8 @@ status_t DrmManagerClientImpl::setOnInfoListener(
             int uniqueId, const sp<DrmManagerClient::OnInfoListener>& infoListener) {
     Mutex::Autolock _l(mLock);
     mOnInfoListener = infoListener;
-    return getDrmManagerService()->setDrmServiceListener(uniqueId, this);
+    return getDrmManagerService()->setDrmServiceListener(uniqueId,
+            (NULL != infoListener.get()) ? this : NULL);
 }
 
 status_t DrmManagerClientImpl::installDrmEngine(int uniqueId, const String8& drmEngineFile) {

include/drm/DrmManagerClient.h

@@ -48,6 +48,9 @@ public:
 public:
     class OnInfoListener: virtual public RefBase {
 
+    public:
+        virtual ~OnInfoListener() {}
+
     public:
         virtual void onInfo(const DrmInfoEvent& event) = 0;
     };