Make sure all references to the decoder plugin are accounted for

before calling dlunload().

Change-Id: I59aa1d19edf566b8a86a6f73b1c2eeb47c96b0de
related-to-bug: 4466387

4 files changed, 10 insertions, 2 deletions

diff --git a/media/libstagefright/include/SimpleSoftOMXComponent.h b/media/libstagefright/include/SimpleSoftOMXComponent.h
index 2a29a7d..50cd275 100644
--- a/media/libstagefright/include/SimpleSoftOMXComponent.h
+++ b/media/libstagefright/include/SimpleSoftOMXComponent.h
@@ -36,7 +36,7 @@ struct SimpleSoftOMXComponent : public SoftOMXComponent {
             OMX_PTR appData,
             OMX_COMPONENTTYPE **component);
 
-    virtual ~SimpleSoftOMXComponent();
+    virtual void prepareForDestruction();
 
     void onMessageReceived(const sp<AMessage> &msg);
 
diff --git a/media/libstagefright/include/SoftOMXComponent.h b/media/libstagefright/include/SoftOMXComponent.h
index 053bc22..a808611 100644
--- a/media/libstagefright/include/SoftOMXComponent.h
+++ b/media/libstagefright/include/SoftOMXComponent.h
@@ -38,6 +38,8 @@ struct SoftOMXComponent : public RefBase {
     void setLibHandle(void *libHandle);
     void *libHandle() const;
 
+    virtual void prepareForDestruction() {}
+
 protected:
     virtual ~SoftOMXComponent();
 
diff --git a/media/libstagefright/omx/SimpleSoftOMXComponent.cpp b/media/libstagefright/omx/SimpleSoftOMXComponent.cpp
index 179b2a0..f7330f3 100644
--- a/media/libstagefright/omx/SimpleSoftOMXComponent.cpp
+++ b/media/libstagefright/omx/SimpleSoftOMXComponent.cpp
@@ -45,7 +45,11 @@ SimpleSoftOMXComponent::SimpleSoftOMXComponent(
             PRIORITY_AUDIO);
 }
 
-SimpleSoftOMXComponent::~SimpleSoftOMXComponent() {
+void SimpleSoftOMXComponent::prepareForDestruction() {
+    // The looper's queue may still contain messages referencing this
+    // object. Make sure those are flushed before returning so that
+    // a subsequent dlunload() does not pull out the rug from under us.
+
     mLooper->unregisterHandler(mHandler->id());
     mLooper->stop();
 }
diff --git a/media/libstagefright/omx/SoftOMXPlugin.cpp b/media/libstagefright/omx/SoftOMXPlugin.cpp
index cfbcb96..04ca39e 100644
--- a/media/libstagefright/omx/SoftOMXPlugin.cpp
+++ b/media/libstagefright/omx/SoftOMXPlugin.cpp
@@ -127,6 +127,8 @@ OMX_ERRORTYPE SoftOMXPlugin::destroyComponentInstance(
         (SoftOMXComponent *)
             ((OMX_COMPONENTTYPE *)component)->pComponentPrivate;
 
+    me->prepareForDestruction();
+
     void *libHandle = me->libHandle();
 
     CHECK_EQ(me->getStrongCount(), 1);