mei: fix return value on disconnect timeout

wait_event_timeout can return 0 or the remaining jiffies
so return -ETIME if disconnected state not reached.

Cc: stable@vger.kernel.org # 3.10+
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/mei/client.c

@@ -459,7 +459,7 @@ int mei_cl_disconnect(struct mei_cl *cl)
 {
 	struct mei_device *dev;
 	struct mei_cl_cb *cb;
-	int rets, err;
+	int rets;
 
 	if (WARN_ON(!cl || !cl->dev))
 		return -ENODEV;
@@ -501,23 +501,18 @@ int mei_cl_disconnect(struct mei_cl *cl)
 	}
 	mutex_unlock(&dev->device_lock);
 
-	err = wait_event_timeout(dev->wait_recvd_msg,
+	wait_event_timeout(dev->wait_recvd_msg,
 			MEI_FILE_DISCONNECTED == cl->state,
 			mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
 
 	mutex_lock(&dev->device_lock);
+
 	if (MEI_FILE_DISCONNECTED == cl->state) {
 		rets = 0;
 		cl_dbg(dev, cl, "successfully disconnected from FW client.\n");
 	} else {
-		rets = -ENODEV;
-		if (MEI_FILE_DISCONNECTED != cl->state)
-			cl_err(dev, cl, "wrong status client disconnect.\n");
-
-		if (err)
-			cl_dbg(dev, cl, "wait failed disconnect err=%d\n", err);
-
-		cl_err(dev, cl, "failed to disconnect from FW client.\n");
+		cl_dbg(dev, cl, "timeout on disconnect from FW client.\n");
+		rets = -ETIME;
 	}
 
 	mei_io_list_flush(&dev->ctrl_rd_list, cl);