diff --git a/core/java/android/bluetooth/BluetoothGatt.java b/core/java/android/bluetooth/BluetoothGatt.java
index bbd0439..e7ab8de 100644
--- a/core/java/android/bluetooth/BluetoothGatt.java
+++ b/core/java/android/bluetooth/BluetoothGatt.java
@@ -61,6 +61,7 @@
     private boolean mAutoConnect;
     private int mConnState;
     private final Object mStateLock = new Object();
+    private Boolean mDeviceBusy = false;
 
     private static final int CONN_STATE_IDLE = 0;
     private static final int CONN_STATE_CONNECTING = 1;
@@ -177,6 +178,10 @@
                         mConnState = CONN_STATE_IDLE;
                     }
                 }
+
+                synchronized(mDeviceBusy) {
+                    mDeviceBusy = false;
+                }
             }
 
             /**
@@ -312,6 +317,11 @@
                 if (!address.equals(mDevice.getAddress())) {
                     return;
                 }
+
+                synchronized(mDeviceBusy) {
+                    mDeviceBusy = false;
+                }
+
                 if ((status == GATT_INSUFFICIENT_AUTHENTICATION
                   || status == GATT_INSUFFICIENT_ENCRYPTION)
                   && mAuthRetry == false) {
@@ -359,6 +369,11 @@
                 if (!address.equals(mDevice.getAddress())) {
                     return;
                 }
+
+                synchronized(mDeviceBusy) {
+                    mDeviceBusy = false;
+                }
+
                 BluetoothGattService service = getService(mDevice, srvcUuid.getUuid(),
                                                           srvcInstId, srvcType);
                 if (service == null) return;
@@ -436,6 +451,11 @@
                 if (!address.equals(mDevice.getAddress())) {
                     return;
                 }
+
+                synchronized(mDeviceBusy) {
+                    mDeviceBusy = false;
+                }
+
                 BluetoothGattService service = getService(mDevice, srvcUuid.getUuid(),
                                                           srvcInstId, srvcType);
                 if (service == null) return;
@@ -485,6 +505,11 @@
                 if (!address.equals(mDevice.getAddress())) {
                     return;
                 }
+
+                synchronized(mDeviceBusy) {
+                    mDeviceBusy = false;
+                }
+
                 BluetoothGattService service = getService(mDevice, srvcUuid.getUuid(),
                                                           srvcInstId, srvcType);
                 if (service == null) return;
@@ -530,6 +555,11 @@
                 if (!address.equals(mDevice.getAddress())) {
                     return;
                 }
+
+                synchronized(mDeviceBusy) {
+                    mDeviceBusy = false;
+                }
+
                 try {
                     mCallback.onReliableWriteCompleted(BluetoothGatt.this, status);
                 } catch (Exception ex) {
@@ -862,6 +892,11 @@
         BluetoothDevice device = service.getDevice();
         if (device == null) return false;
 
+        synchronized(mDeviceBusy) {
+            if (mDeviceBusy) return false;
+            mDeviceBusy = true;
+        }
+
         try {
             mService.readCharacteristic(mClientIf, device.getAddress(),
                 service.getType(), service.getInstanceId(),
@@ -869,6 +904,7 @@
                 new ParcelUuid(characteristic.getUuid()), AUTHENTICATION_NONE);
         } catch (RemoteException e) {
             Log.e(TAG,"",e);
+            mDeviceBusy = false;
             return false;
         }
 
@@ -901,6 +937,11 @@
         BluetoothDevice device = service.getDevice();
         if (device == null) return false;
 
+        synchronized(mDeviceBusy) {
+            if (mDeviceBusy) return false;
+            mDeviceBusy = true;
+        }
+
         try {
             mService.writeCharacteristic(mClientIf, device.getAddress(),
                 service.getType(), service.getInstanceId(),
@@ -910,6 +951,7 @@
                 characteristic.getValue());
         } catch (RemoteException e) {
             Log.e(TAG,"",e);
+            mDeviceBusy = false;
             return false;
         }
 
@@ -941,6 +983,11 @@
         BluetoothDevice device = service.getDevice();
         if (device == null) return false;
 
+        synchronized(mDeviceBusy) {
+            if (mDeviceBusy) return false;
+            mDeviceBusy = true;
+        }
+
         try {
             mService.readDescriptor(mClientIf, device.getAddress(), service.getType(),
                 service.getInstanceId(), new ParcelUuid(service.getUuid()),
@@ -949,6 +996,7 @@
                 AUTHENTICATION_NONE);
         } catch (RemoteException e) {
             Log.e(TAG,"",e);
+            mDeviceBusy = false;
             return false;
         }
 
@@ -979,6 +1027,11 @@
         BluetoothDevice device = service.getDevice();
         if (device == null) return false;
 
+        synchronized(mDeviceBusy) {
+            if (mDeviceBusy) return false;
+            mDeviceBusy = true;
+        }
+
         try {
             mService.writeDescriptor(mClientIf, device.getAddress(), service.getType(),
                 service.getInstanceId(), new ParcelUuid(service.getUuid()),
@@ -988,6 +1041,7 @@
                 descriptor.getValue());
         } catch (RemoteException e) {
             Log.e(TAG,"",e);
+            mDeviceBusy = false;
             return false;
         }
 
@@ -1045,10 +1099,16 @@
         if (DBG) Log.d(TAG, "executeReliableWrite() - device: " + mDevice.getAddress());
         if (mService == null || mClientIf == 0) return false;
 
+        synchronized(mDeviceBusy) {
+            if (mDeviceBusy) return false;
+            mDeviceBusy = true;
+        }
+
         try {
             mService.endReliableWrite(mClientIf, mDevice.getAddress(), true);
         } catch (RemoteException e) {
             Log.e(TAG,"",e);
+            mDeviceBusy = false;
             return false;
         }