diff --git a/services/camera/libcameraservice/CameraFlashlight.cpp b/services/camera/libcameraservice/CameraFlashlight.cpp
index 0afd945..ad08a68 100644
--- a/services/camera/libcameraservice/CameraFlashlight.cpp
+++ b/services/camera/libcameraservice/CameraFlashlight.cpp
@@ -679,7 +679,8 @@
     status_t res;
     if (enabled) {
         bool hasFlash = false;
-        res = hasFlashUnitLocked(cameraId, &hasFlash);
+        // Check if it has a flash unit and leave camera device open.
+        res = hasFlashUnitLocked(cameraId, &hasFlash, /*keepDeviceOpen*/true);
         // invalid camera?
         if (res) {
             // hasFlashUnitLocked() returns BAD_INDEX if mDevice is connected to
@@ -688,6 +689,8 @@
         }
         // no flash unit?
         if (!hasFlash) {
+            // Disconnect camera device if it has no flash.
+            disconnectCameraDevice();
             return -ENOSYS;
         }
     } else if (mDevice == NULL || cameraId != mCameraId) {
@@ -716,21 +719,28 @@
 status_t CameraHardwareInterfaceFlashControl::hasFlashUnit(
         const String8& cameraId, bool *hasFlash) {
     Mutex::Autolock l(mLock);
-    return hasFlashUnitLocked(cameraId, hasFlash);
+    // Close device after checking if it has a flash unit.
+    return hasFlashUnitLocked(cameraId, hasFlash, /*keepDeviceOpen*/false);
 }
 
 status_t CameraHardwareInterfaceFlashControl::hasFlashUnitLocked(
-        const String8& cameraId, bool *hasFlash) {
+        const String8& cameraId, bool *hasFlash, bool keepDeviceOpen) {
+    bool closeCameraDevice = false;
+
     if (!hasFlash) {
         return BAD_VALUE;
     }
 
     status_t res;
     if (mDevice == NULL) {
+        // Connect to camera device to query if it has a flash unit.
         res = connectCameraDevice(cameraId);
         if (res) {
             return res;
         }
+        // Close camera device only when it is just opened and the caller doesn't want to keep
+        // the camera device open.
+        closeCameraDevice = !keepDeviceOpen;
     }
 
     if (cameraId != mCameraId) {
@@ -745,6 +755,15 @@
         *hasFlash = false;
     }
 
+    if (closeCameraDevice) {
+        res = disconnectCameraDevice();
+        if (res != OK) {
+            ALOGE("%s: Failed to disconnect camera device. %s (%d)", __FUNCTION__,
+                    strerror(-res), res);
+            return res;
+        }
+    }
+
     return OK;
 }
 
@@ -869,9 +888,13 @@
         return OK;
     }
 
-    mParameters.set(CameraParameters::KEY_FLASH_MODE,
-            CameraParameters::FLASH_MODE_OFF);
-    mDevice->setParameters(mParameters);
+    if (mParameters.get(CameraParameters::KEY_FLASH_MODE)) {
+        // There is a flash, turn if off.
+        // (If there isn't one, leave the parameter null)
+        mParameters.set(CameraParameters::KEY_FLASH_MODE,
+                CameraParameters::FLASH_MODE_OFF);
+        mDevice->setParameters(mParameters);
+    }
     mDevice->stopPreview();
     status_t res = native_window_api_disconnect(mSurface.get(),
             NATIVE_WINDOW_API_CAMERA);
diff --git a/services/camera/libcameraservice/CameraFlashlight.h b/services/camera/libcameraservice/CameraFlashlight.h
index 4d5fe8d..5cde372 100644
--- a/services/camera/libcameraservice/CameraFlashlight.h
+++ b/services/camera/libcameraservice/CameraFlashlight.h
@@ -203,7 +203,11 @@
         status_t getSmallestSurfaceSize(int32_t *width, int32_t *height);
 
         // protected by mLock
-        status_t hasFlashUnitLocked(const String8& cameraId, bool *hasFlash);
+        // If this function opens camera device in order to check if it has a flash unit, the
+        // camera device will remain open if keepDeviceOpen is true and the camera device will be
+        // closed if keepDeviceOpen is false. If camera device is already open when calling this
+        // function, keepDeviceOpen is ignored.
+        status_t hasFlashUnitLocked(const String8& cameraId, bool *hasFlash, bool keepDeviceOpen);
 
         CameraModule *mCameraModule;
         const camera_module_callbacks_t *mCallbacks;