diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 328594b..533d4ba 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -2051,14 +2051,15 @@
 }
 
 
-void SurfaceFlinger::doDisplayComposition(const sp<const DisplayDevice>& hw,
+void SurfaceFlinger::doDisplayComposition(
+        const sp<const DisplayDevice>& displayDevice,
         const Region& inDirtyRegion)
 {
     // We only need to actually compose the display if:
     // 1) It is being handled by hardware composer, which may need this to
     //    keep its virtual display state machine in sync, or
     // 2) There is work to be done (the dirty region isn't empty)
-    bool isHwcDisplay = hw->getHwcDisplayId() >= 0;
+    bool isHwcDisplay = displayDevice->getHwcDisplayId() >= 0;
     if (!isHwcDisplay && inDirtyRegion.isEmpty()) {
         ALOGV("Skipping display composition");
         return;
@@ -2069,35 +2070,35 @@
     Region dirtyRegion(inDirtyRegion);
 
     // compute the invalid region
-    hw->swapRegion.orSelf(dirtyRegion);
+    displayDevice->swapRegion.orSelf(dirtyRegion);
 
-    uint32_t flags = hw->getFlags();
+    uint32_t flags = displayDevice->getFlags();
     if (flags & DisplayDevice::SWAP_RECTANGLE) {
         // we can redraw only what's dirty, but since SWAP_RECTANGLE only
         // takes a rectangle, we must make sure to update that whole
         // rectangle in that case
-        dirtyRegion.set(hw->swapRegion.bounds());
+        dirtyRegion.set(displayDevice->swapRegion.bounds());
     } else {
         if (flags & DisplayDevice::PARTIAL_UPDATES) {
             // We need to redraw the rectangle that will be updated
             // (pushed to the framebuffer).
             // This is needed because PARTIAL_UPDATES only takes one
             // rectangle instead of a region (see DisplayDevice::flip())
-            dirtyRegion.set(hw->swapRegion.bounds());
+            dirtyRegion.set(displayDevice->swapRegion.bounds());
         } else {
             // we need to redraw everything (the whole screen)
-            dirtyRegion.set(hw->bounds());
-            hw->swapRegion = dirtyRegion;
+            dirtyRegion.set(displayDevice->bounds());
+            displayDevice->swapRegion = dirtyRegion;
         }
     }
 
-    if (!doComposeSurfaces(hw, dirtyRegion)) return;
+    if (!doComposeSurfaces(displayDevice, dirtyRegion)) return;
 
     // update the swap region and clear the dirty region
-    hw->swapRegion.orSelf(dirtyRegion);
+    displayDevice->swapRegion.orSelf(dirtyRegion);
 
     // swap buffers (presentation)
-    hw->swapBuffers(getHwComposer());
+    displayDevice->swapBuffers(getHwComposer());
 }
 
 bool SurfaceFlinger::doComposeSurfaces(
@@ -2241,8 +2242,8 @@
     return true;
 }
 
-void SurfaceFlinger::drawWormhole(const sp<const DisplayDevice>& hw, const Region& region) const {
-    const int32_t height = hw->getHeight();
+void SurfaceFlinger::drawWormhole(const sp<const DisplayDevice>& displayDevice, const Region& region) const {
+    const int32_t height = displayDevice->getHeight();
     RenderEngine& engine(getRenderEngine());
     engine.fillRegionWithColor(region, height, 0, 0, 0, 0);
 }
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 3af1754..49964ec 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -405,14 +405,14 @@
     void setUpHWComposer();
     void doComposition();
     void doDebugFlashRegions();
-    void doDisplayComposition(const sp<const DisplayDevice>& hw, const Region& dirtyRegion);
+    void doDisplayComposition(const sp<const DisplayDevice>& displayDevice, const Region& dirtyRegion);
 
     // compose surfaces for display hw. this fails if using GL and the surface
     // has been destroyed and is no longer valid.
-    bool doComposeSurfaces(const sp<const DisplayDevice>& hw, const Region& dirty);
+    bool doComposeSurfaces(const sp<const DisplayDevice>& displayDevice, const Region& dirty);
 
     void postFramebuffer();
-    void drawWormhole(const sp<const DisplayDevice>& hw, const Region& region) const;
+    void drawWormhole(const sp<const DisplayDevice>& displayDevice, const Region& region) const;
 
     /* ------------------------------------------------------------------------
      * Display management