diff --git a/libs/surfaceflinger/LayerBuffer.cpp b/libs/surfaceflinger/LayerBuffer.cpp
index 433b48e..0945571 100644
--- a/libs/surfaceflinger/LayerBuffer.cpp
+++ b/libs/surfaceflinger/LayerBuffer.cpp
@@ -354,7 +354,7 @@
 {    
     ISurface::BufferHeap buffers;
     { // scope for the lock
-        Mutex::Autolock _l(mLock);
+        Mutex::Autolock _l(mBufferSourceLock);
         buffers = mBufferHeap;
         if (buffers.heap != 0) {
             const size_t memorySize = buffers.heap->getSize();
@@ -379,7 +379,7 @@
 
 void LayerBuffer::BufferSource::unregisterBuffers()
 {
-    Mutex::Autolock _l(mLock);
+    Mutex::Autolock _l(mBufferSourceLock);
     mBufferHeap.heap.clear();
     mBuffer.clear();
     mLayer.invalidate();
@@ -387,13 +387,13 @@
 
 sp<LayerBuffer::Buffer> LayerBuffer::BufferSource::getBuffer() const
 {
-    Mutex::Autolock _l(mLock);
+    Mutex::Autolock _l(mBufferSourceLock);
     return mBuffer;
 }
 
 void LayerBuffer::BufferSource::setBuffer(const sp<LayerBuffer::Buffer>& buffer)
 {
-    Mutex::Autolock _l(mLock);
+    Mutex::Autolock _l(mBufferSourceLock);
     mBuffer = buffer;
 }
 
@@ -583,7 +583,7 @@
 
     mOverlayHandle = overlay->getHandleRef(overlay);
     
-    // NOTE: here it's okay to acquire a reference to "this"m as long as
+    // NOTE: here it's okay to acquire a reference to "this" as long as
     // the reference is not released before we leave the ctor.
     sp<OverlayChannel> channel = new OverlayChannel(this);
 
@@ -601,7 +601,6 @@
 
 void LayerBuffer::OverlaySource::onDraw(const Region& clip) const
 {
-    GLclampx color = 0x000018; //dark blue
     GLclampx red = 0;
     GLclampx green = 0;
     GLclampx blue = 0x1818;
@@ -633,7 +632,7 @@
             int h = bounds.height();
             
             // we need a lock here to protect "destroy"
-            Mutex::Autolock _l(mLock);
+            Mutex::Autolock _l(mOverlaySourceLock);
             if (mOverlay) {
                 overlay_control_device_t* overlay_dev = mOverlayDevice;
                 overlay_dev->setPosition(overlay_dev, mOverlay, x,y,w,h);
@@ -654,7 +653,7 @@
 void LayerBuffer::OverlaySource::destroyOverlay() 
 {
     // we need a lock here to protect "onVisibilityResolved"
-    Mutex::Autolock _l(mLock);
+    Mutex::Autolock _l(mOverlaySourceLock);
     if (mOverlay) {
         overlay_control_device_t* overlay_dev = mOverlayDevice;
         overlay_dev->destroyOverlay(overlay_dev, mOverlay);
diff --git a/libs/surfaceflinger/LayerBuffer.h b/libs/surfaceflinger/LayerBuffer.h
index e539f68..3b09998 100644
--- a/libs/surfaceflinger/LayerBuffer.h
+++ b/libs/surfaceflinger/LayerBuffer.h
@@ -124,7 +124,7 @@
         virtual void unregisterBuffers();
         virtual bool transformed() const;
     private:
-        mutable Mutex                   mLock;
+        mutable Mutex                   mBufferSourceLock;
         sp<Buffer>                      mBuffer;
         status_t                        mStatus;
         ISurface::BufferHeap            mBufferHeap;
@@ -145,14 +145,18 @@
         virtual void onVisibilityResolved(const Transform& planeTransform);
     private:
         void serverDestroy(); 
-        void destroyOverlay(); 
+        void destroyOverlay();
+        
         class OverlayChannel : public BnOverlay {
-            mutable Mutex mLock;
-            sp<OverlaySource> mSource;
+        public:
+            OverlayChannel(const sp<OverlaySource>& source)
+                : mSource(source) {
+            }
+        private:
             virtual void destroy() {
                 sp<OverlaySource> source;
                 { // scope for the lock;
-                    Mutex::Autolock _l(mLock);
+                    Mutex::Autolock _l(mDestroyLock);
                     source = mSource;
                     mSource.clear();
                 }
@@ -160,11 +164,10 @@
                     source->serverDestroy();
                 }
             }
-        public:
-            OverlayChannel(const sp<OverlaySource>& source)
-                : mSource(source) {
-            }
+            mutable Mutex mDestroyLock;
+            sp<OverlaySource> mSource;
         };
+        
         friend class OverlayChannel;
         bool mVisibilityChanged;
 
@@ -176,7 +179,7 @@
         int32_t mFormat;
         int32_t mWidthStride;
         int32_t mHeightStride;
-        mutable Mutex mLock;
+        mutable Mutex mOverlaySourceLock;
         bool mInitialized;
     };
 
@@ -199,7 +202,7 @@
             return static_cast<LayerBuffer*>(Surface::getOwner().get());
         }
     };
-    
+
     mutable Mutex   mLock;
     sp<Source>      mSource;
     sp<Surface>     mSurface;