From 07d0220bcc9036bcbe36819912559267d9c1c538 Mon Sep 17 00:00:00 2001
From: Gloria Wang <gwang@google.com>
Date: Wed, 23 Mar 2011 22:35:13 -0700
Subject: Fix for bug 4165823. Add death listener to clean-up drmserver
 appropriately when drmserver died. Cherry-pick from master. Do not merge.

Change-Id: I7782cc96ce173a87ebfd315950f3880fa90294d6
---
 drm/libdrmframework/DrmManagerClientImpl.cpp       | 32 ++++++++++++++++------
 drm/libdrmframework/include/DrmManagerClientImpl.h | 12 ++++++--
 2 files changed, 34 insertions(+), 10 deletions(-)

diff --git a/drm/libdrmframework/DrmManagerClientImpl.cpp b/drm/libdrmframework/DrmManagerClientImpl.cpp
index d20de92..9c7fed3 100644
--- a/drm/libdrmframework/DrmManagerClientImpl.cpp
+++ b/drm/libdrmframework/DrmManagerClientImpl.cpp
@@ -28,8 +28,9 @@ using namespace android;
 
 #define INVALID_VALUE -1
 
-Mutex DrmManagerClientImpl::mMutex;
-sp<IDrmManagerService> DrmManagerClientImpl::mDrmManagerService;
+Mutex DrmManagerClientImpl::sMutex;
+sp<IDrmManagerService> DrmManagerClientImpl::sDrmManagerService;
+sp<DrmManagerClientImpl::DeathNotifier> DrmManagerClientImpl::sDeathNotifier;
 const String8 DrmManagerClientImpl::EMPTY_STRING("");
 
 DrmManagerClientImpl* DrmManagerClientImpl::create(int* pUniqueId) {
@@ -47,8 +48,8 @@ void DrmManagerClientImpl::remove(int uniqueId) {
 }
 
 const sp<IDrmManagerService>& DrmManagerClientImpl::getDrmManagerService() {
-    mMutex.lock();
-    if (NULL == mDrmManagerService.get()) {
+    Mutex::Autolock lock(sMutex);
+    if (NULL == sDrmManagerService.get()) {
         sp<IServiceManager> sm = defaultServiceManager();
         sp<IBinder> binder;
         do {
@@ -62,11 +63,13 @@ const sp<IDrmManagerService>& DrmManagerClientImpl::getDrmManagerService() {
             reqt.tv_nsec = 500000000; //0.5 sec
             nanosleep(&reqt, NULL);
         } while (true);
-
-        mDrmManagerService = interface_cast<IDrmManagerService>(binder);
+        if (NULL == sDeathNotifier.get()) {
+            sDeathNotifier = new DeathNotifier();
+        }
+        binder->linkToDeath(sDeathNotifier);
+        sDrmManagerService = interface_cast<IDrmManagerService>(binder);
     }
-    mMutex.unlock();
-    return mDrmManagerService;
+    return sDrmManagerService;
 }
 
 void DrmManagerClientImpl::addClient(int uniqueId) {
@@ -309,3 +312,16 @@ status_t DrmManagerClientImpl::notify(const DrmInfoEvent& event) {
     return DRM_NO_ERROR;
 }
 
+DrmManagerClientImpl::DeathNotifier::~DeathNotifier() {
+    Mutex::Autolock lock(sMutex);
+    if (NULL != sDrmManagerService.get()) {
+        sDrmManagerService->asBinder()->unlinkToDeath(this);
+    }
+}
+
+void DrmManagerClientImpl::DeathNotifier::binderDied(const wp<IBinder>& who) {
+    Mutex::Autolock lock(sMutex);
+    DrmManagerClientImpl::sDrmManagerService.clear();
+    LOGW("DrmManager server died!");
+}
+
diff --git a/drm/libdrmframework/include/DrmManagerClientImpl.h b/drm/libdrmframework/include/DrmManagerClientImpl.h
index 0a7fcd1..429e4c3 100644
--- a/drm/libdrmframework/include/DrmManagerClientImpl.h
+++ b/drm/libdrmframework/include/DrmManagerClientImpl.h
@@ -407,9 +407,17 @@ private:
     Mutex mLock;
     sp<DrmManagerClient::OnInfoListener> mOnInfoListener;
 
+    class DeathNotifier: public IBinder::DeathRecipient {
+        public:
+            DeathNotifier() {}
+            virtual ~DeathNotifier();
+            virtual void binderDied(const wp<IBinder>& who);
+    };
+
 private:
-    static Mutex mMutex;
-    static sp<IDrmManagerService> mDrmManagerService;
+    static Mutex sMutex;
+    static sp<DeathNotifier> sDeathNotifier;
+    static sp<IDrmManagerService> sDrmManagerService;
     static const sp<IDrmManagerService>& getDrmManagerService();
     static const String8 EMPTY_STRING;
 };
-- 
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