camera3: Don't try to disconnect stream native windows more than once

This fixes the multiple-disconnect-from-BufferQueue bug.

(In logs)
BufferQueue: [SurfaceView] disconnect: connected to another api (cur=0, req=4)

Bug: 9114681
Change-Id: I21ae1c5bd993701eea13648aa9994979a24eb210

4 files changed, 15 insertions, 2 deletions

diff --git a/services/camera/libcameraservice/Camera3Device.cpp b/services/camera/libcameraservice/Camera3Device.cpp
index 1d38993..0b5e9c4 100644
--- a/services/camera/libcameraservice/Camera3Device.cpp
+++ b/services/camera/libcameraservice/Camera3Device.cpp
@@ -677,6 +677,8 @@ status_t Camera3Device::deleteStream(int id) {
     Mutex::Autolock l(mLock);
     status_t res;
 
+    ALOGV("%s: Camera %d: Deleting stream %d", __FUNCTION__, mId, id);
+
     // CameraDevice semantics require device to already be idle before
     // deleteStream is called, unlike for createStream.
     if (mStatus != STATUS_IDLE) {
diff --git a/services/camera/libcameraservice/camera3/Camera3IOStreamBase.cpp b/services/camera/libcameraservice/camera3/Camera3IOStreamBase.cpp
index abc28fe..0850566 100644
--- a/services/camera/libcameraservice/camera3/Camera3IOStreamBase.cpp
+++ b/services/camera/libcameraservice/camera3/Camera3IOStreamBase.cpp
@@ -159,7 +159,9 @@ status_t Camera3IOStreamBase::disconnectLocked() {
             break;
         default:
             // No connection, nothing to do
-            return OK;
+            ALOGV("%s: Stream %d: Already disconnected",
+                  __FUNCTION__, mId);
+            return -ENOTCONN;
     }
 
     if (mDequeuedBufferCount > 0) {
diff --git a/services/camera/libcameraservice/camera3/Camera3Stream.cpp b/services/camera/libcameraservice/camera3/Camera3Stream.cpp
index 9c9c258..f05658a 100644
--- a/services/camera/libcameraservice/camera3/Camera3Stream.cpp
+++ b/services/camera/libcameraservice/camera3/Camera3Stream.cpp
@@ -258,7 +258,15 @@ bool Camera3Stream::hasOutstandingBuffers() const {
 status_t Camera3Stream::disconnect() {
     ATRACE_CALL();
     Mutex::Autolock l(mLock);
-    return disconnectLocked();
+    ALOGV("%s: Stream %d: Disconnecting...", __FUNCTION__, mId);
+    status_t res = disconnectLocked();
+
+    if (res == -ENOTCONN) {
+        // "Already disconnected" -- not an error
+        return OK;
+    } else {
+        return res;
+    }
 }
 
 status_t Camera3Stream::registerBuffersLocked(camera3_device *hal3Device) {
diff --git a/services/camera/libcameraservice/camera3/Camera3Stream.h b/services/camera/libcameraservice/camera3/Camera3Stream.h
index 4b3b346..69d81e4 100644
--- a/services/camera/libcameraservice/camera3/Camera3Stream.h
+++ b/services/camera/libcameraservice/camera3/Camera3Stream.h
@@ -251,6 +251,7 @@ class Camera3Stream :
     virtual status_t returnInputBufferLocked(
             const camera3_stream_buffer &buffer);
     virtual bool     hasOutstandingBuffersLocked() const = 0;
+    // Can return -ENOTCONN when we are already disconnected (not an error)
     virtual status_t disconnectLocked() = 0;
 
     // Configure the buffer queue interface to the other end of the stream,