diff --git a/libwvdrmengine/mediadrm/include/WVDrmPlugin.h b/libwvdrmengine/mediadrm/include/WVDrmPlugin.h
index 46429d01..83d340d7 100644
--- a/libwvdrmengine/mediadrm/include/WVDrmPlugin.h
+++ b/libwvdrmengine/mediadrm/include/WVDrmPlugin.h
@@ -16,7 +16,6 @@
 #include "utils/Errors.h"
 #include "utils/KeyedVector.h"
 #include "utils/List.h"
-#include "utils/Mutex.h"
 #include "utils/String8.h"
 #include "utils/Vector.h"
 #include "wv_cdm_event_listener.h"
@@ -27,7 +26,6 @@ namespace wvdrm {
 
 using android::KeyedVector;
 using android::List;
-using android::Mutex;
 using android::status_t;
 using android::String8;
 using android::Vector;
@@ -253,8 +251,6 @@ class WVDrmPlugin : public android::DrmPlugin,
   WvContentDecryptionModule* mCDM;
   WVGenericCryptoInterface* mCrypto;
   std::string mOrigin;
-
-  Mutex mCryptoSessionsMutex;
   map<CdmSessionId, CryptoSession> mCryptoSessions;
 
   status_t queryProperty(const std::string& property,
diff --git a/libwvdrmengine/mediadrm/src/WVDrmPlugin.cpp b/libwvdrmengine/mediadrm/src/WVDrmPlugin.cpp
index 3491f2f7..461ddb3a 100644
--- a/libwvdrmengine/mediadrm/src/WVDrmPlugin.cpp
+++ b/libwvdrmengine/mediadrm/src/WVDrmPlugin.cpp
@@ -75,12 +75,10 @@ DrmPlugin::KeyStatusType ConvertFromCdmKeyStatus(CdmKeyStatus keyStatus) {
 
 WVDrmPlugin::WVDrmPlugin(WvContentDecryptionModule* cdm,
                          WVGenericCryptoInterface* crypto)
-  : mCDM(cdm), mCrypto(crypto), mOrigin(), mCryptoSessionsMutex(),
-    mCryptoSessions() {}
+  : mCDM(cdm), mCrypto(crypto), mOrigin(), mCryptoSessions() {}
 
 WVDrmPlugin::~WVDrmPlugin() {
   typedef map<CdmSessionId, CryptoSession>::iterator mapIterator;
-  Mutex::Autolock lock(mCryptoSessionsMutex);
   for (mapIterator iter = mCryptoSessions.begin();
        iter != mCryptoSessions.end();
        ++iter) {
@@ -112,12 +110,7 @@ status_t WVDrmPlugin::openSession(Vector<uint8_t>& sessionId) {
       info.count(QUERY_KEY_OEMCRYPTO_SESSION_ID)) {
     OEMCrypto_SESSION oecSessionId;
     istringstream(info[QUERY_KEY_OEMCRYPTO_SESSION_ID]) >> oecSessionId;
-
-    {
-      Mutex::Autolock lock(mCryptoSessionsMutex);
-      mCryptoSessions[cdmSessionId] = CryptoSession(oecSessionId);
-    }
-
+    mCryptoSessions[cdmSessionId] = CryptoSession(oecSessionId);
     success = true;
   } else {
     ALOGE("Unable to query key control info.");
@@ -147,12 +140,7 @@ status_t WVDrmPlugin::openSession(Vector<uint8_t>& sessionId) {
 status_t WVDrmPlugin::closeSession(const Vector<uint8_t>& sessionId) {
   CdmSessionId cdmSessionId(sessionId.begin(), sessionId.end());
   CdmResponseType res = mCDM->CloseSession(cdmSessionId);
-
-  if (isCdmResponseTypeSuccess(res)) {
-    Mutex::Autolock lock(mCryptoSessionsMutex);
-    mCryptoSessions.erase(cdmSessionId);
-  }
-
+  mCryptoSessions.erase(cdmSessionId);
   return mapAndNotifyOfCdmResponseType(sessionId, res);
 }
 
@@ -542,12 +530,7 @@ status_t WVDrmPlugin::getPropertyByteArray(const String8& name,
 status_t WVDrmPlugin::setPropertyString(const String8& name,
                                         const String8& value) {
   if (name == "securityLevel") {
-    size_t sessionCount = 0;
-    {
-      Mutex::Autolock lock(mCryptoSessionsMutex);
-      sessionCount = mCryptoSessions.size();
-    }
-    if (sessionCount == 0) {
+    if (mCryptoSessions.size() == 0) {
       if (value == QUERY_VALUE_SECURITY_LEVEL_L3.c_str()) {
         mPropertySet.set_security_level(QUERY_VALUE_SECURITY_LEVEL_L3);
       } else if (value == QUERY_VALUE_SECURITY_LEVEL_L1.c_str()) {
@@ -583,12 +566,7 @@ status_t WVDrmPlugin::setPropertyString(const String8& name,
       return android::BAD_VALUE;
     }
   } else if (name == "sessionSharing") {
-    size_t sessionCount = 0;
-    {
-      Mutex::Autolock lock(mCryptoSessionsMutex);
-      sessionCount = mCryptoSessions.size();
-    }
-    if (sessionCount == 0) {
+    if (mCryptoSessions.size() == 0) {
       if (value == kEnable) {
         mPropertySet.set_is_session_sharing_enabled(true);
       } else if (value == kDisable) {
@@ -602,24 +580,14 @@ status_t WVDrmPlugin::setPropertyString(const String8& name,
       return kErrorSessionIsOpen;
     }
   } else if (name == "appId") {
-    size_t sessionCount = 0;
-    {
-      Mutex::Autolock lock(mCryptoSessionsMutex);
-      sessionCount = mCryptoSessions.size();
-    }
-    if (sessionCount == 0) {
+    if (mCryptoSessions.size() == 0) {
       mPropertySet.set_app_id(value.string());
     } else {
       ALOGE("App tried to set the application id while sessions are opened.");
       return kErrorSessionIsOpen;
     }
   } else if (name == "origin") {
-    size_t sessionCount = 0;
-    {
-      Mutex::Autolock lock(mCryptoSessionsMutex);
-      sessionCount = mCryptoSessions.size();
-    }
-    if (sessionCount == 0) {
+    if (mCryptoSessions.size() == 0) {
       mOrigin = value.string();
     } else {
       ALOGE("App tried to set the origin while sessions are opened.");
@@ -649,8 +617,6 @@ status_t WVDrmPlugin::setPropertyByteArray(const String8& name,
 status_t WVDrmPlugin::setCipherAlgorithm(const Vector<uint8_t>& sessionId,
                                          const String8& algorithm) {
   CdmSessionId cdmSessionId(sessionId.begin(), sessionId.end());
-  Mutex::Autolock lock(mCryptoSessionsMutex);
-
   if (!mCryptoSessions.count(cdmSessionId)) {
     return android::ERROR_DRM_SESSION_NOT_OPENED;
   }
@@ -669,8 +635,6 @@ status_t WVDrmPlugin::setCipherAlgorithm(const Vector<uint8_t>& sessionId,
 status_t WVDrmPlugin::setMacAlgorithm(const Vector<uint8_t>& sessionId,
                                       const String8& algorithm) {
   CdmSessionId cdmSessionId(sessionId.begin(), sessionId.end());
-  Mutex::Autolock lock(mCryptoSessionsMutex);
-
   if (!mCryptoSessions.count(cdmSessionId)) {
     return android::ERROR_DRM_SESSION_NOT_OPENED;
   }
@@ -692,8 +656,6 @@ status_t WVDrmPlugin::encrypt(const Vector<uint8_t>& sessionId,
                               const Vector<uint8_t>& iv,
                               Vector<uint8_t>& output) {
   CdmSessionId cdmSessionId(sessionId.begin(), sessionId.end());
-  Mutex::Autolock lock(mCryptoSessionsMutex);
-
   if (!mCryptoSessions.count(cdmSessionId)) {
     return android::ERROR_DRM_SESSION_NOT_OPENED;
   }
@@ -732,8 +694,6 @@ status_t WVDrmPlugin::decrypt(const Vector<uint8_t>& sessionId,
                               const Vector<uint8_t>& iv,
                               Vector<uint8_t>& output) {
   CdmSessionId cdmSessionId(sessionId.begin(), sessionId.end());
-  Mutex::Autolock lock(mCryptoSessionsMutex);
-
   if (!mCryptoSessions.count(cdmSessionId)) {
     return android::ERROR_DRM_SESSION_NOT_OPENED;
   }
@@ -771,8 +731,6 @@ status_t WVDrmPlugin::sign(const Vector<uint8_t>& sessionId,
                            const Vector<uint8_t>& message,
                            Vector<uint8_t>& signature) {
   CdmSessionId cdmSessionId(sessionId.begin(), sessionId.end());
-  Mutex::Autolock lock(mCryptoSessionsMutex);
-
   if (!mCryptoSessions.count(cdmSessionId)) {
     return android::ERROR_DRM_SESSION_NOT_OPENED;
   }
@@ -827,8 +785,6 @@ status_t WVDrmPlugin::verify(const Vector<uint8_t>& sessionId,
                              const Vector<uint8_t>& signature,
                              bool& match) {
   CdmSessionId cdmSessionId(sessionId.begin(), sessionId.end());
-  Mutex::Autolock lock(mCryptoSessionsMutex);
-
   if (!mCryptoSessions.count(cdmSessionId)) {
     return android::ERROR_DRM_SESSION_NOT_OPENED;
   }