diff --git a/media/libaaudio/examples/utils/AAudioExampleUtils.h b/media/libaaudio/examples/utils/AAudioExampleUtils.h
index 2671c3a..46b8895 100644
--- a/media/libaaudio/examples/utils/AAudioExampleUtils.h
+++ b/media/libaaudio/examples/utils/AAudioExampleUtils.h
@@ -32,6 +32,7 @@
 #define NANOS_PER_MILLISECOND (NANOS_PER_MICROSECOND * 1000)
 #define NANOS_PER_SECOND      (NANOS_PER_MILLISECOND * 1000)
 
+template <class T = aaudio_sharing_mode_t>
 const char *getSharingModeText(aaudio_sharing_mode_t mode) {
     const char *text = "unknown";
     switch (mode) {
diff --git a/media/mtp/MtpFfsHandle.cpp b/media/mtp/MtpFfsHandle.cpp
index cb9827f..217e0c9 100644
--- a/media/mtp/MtpFfsHandle.cpp
+++ b/media/mtp/MtpFfsHandle.cpp
@@ -311,7 +311,7 @@
 
 int MtpFfsHandle::configure(bool usePtp) {
     // Wait till previous server invocation has closed
-    if (!mLock.try_lock_for(std::chrono::milliseconds(1000))) {
+    if (!mLock.try_lock_for(std::chrono::milliseconds(300))) {
         LOG(ERROR) << "MtpServer was unable to get configure lock";
         return -1;
     }
diff --git a/media/mtp/MtpServer.cpp b/media/mtp/MtpServer.cpp
index 7b3e96e..6080868 100644
--- a/media/mtp/MtpServer.cpp
+++ b/media/mtp/MtpServer.cpp
@@ -134,12 +134,11 @@
             sHandle = new MtpDevHandle();
         }
     }
-    if (sHandle->configure(usePtp)) {
-        ALOGE("Failed to configure Mtp driver!");
-        return -1;
-    }
+
+    int ret = sHandle->configure(usePtp);
+    if (ret) ALOGE("Failed to configure MTP driver!");
     android::base::SetProperty("sys.usb.ffs.mtp.ready", "1");
-    return 0;
+    return ret;
 }
 
 void MtpServer::addStorage(MtpStorage* storage) {
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index 9c24641..80a8dc6 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -755,6 +755,13 @@
 {
     routing_strategy strategy = getStrategy(stream);
     audio_devices_t device = getDeviceForStrategy(strategy, false /*fromCache*/);
+
+    // Note that related method getOutputForAttr() uses getOutputForDevice() not selectOutput().
+    // We use selectOutput() here since we don't have the desired AudioTrack sample rate,
+    // format, flags, etc. This may result in some discrepancy for functions that utilize
+    // getOutput() solely on audio_stream_type such as AudioSystem::getOutputFrameCount()
+    // and AudioSystem::getOutputSamplingRate().
+
     SortedVector<audio_io_handle_t> outputs = getOutputsForDevice(device, mOutputs);
     audio_io_handle_t output = selectOutput(outputs, AUDIO_OUTPUT_FLAG_NONE, AUDIO_FORMAT_INVALID);
 
@@ -1102,8 +1109,9 @@
             int commonFlags = popcount(outputDesc->mProfile->getFlags() & flags);
             if (commonFlags >= maxCommonFlags) {
                 if (commonFlags == maxCommonFlags) {
-                    if (AudioPort::isBetterFormatMatch(
-                            outputDesc->mFormat, bestFormatForFlags, format)) {
+                    if (format != AUDIO_FORMAT_INVALID
+                            && AudioPort::isBetterFormatMatch(
+                                    outputDesc->mFormat, bestFormatForFlags, format)) {
                         outputForFlags = outputs[i];
                         bestFormatForFlags = outputDesc->mFormat;
                     }