diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
index b09a527..0c9df97 100644
--- a/drivers/usb/class/usbtmc.c
+++ b/drivers/usb/class/usbtmc.c
@@ -86,6 +86,8 @@
 	bool TermCharEnabled;
 	bool auto_abort;
 
+	bool zombie; /* fd of disconnected device */
+
 	struct usbtmc_dev_capabilities	capabilities;
 	struct kref kref;
 	struct mutex io_mutex;	/* only one i/o function running at a time */
@@ -384,6 +386,10 @@
 		return -ENOMEM;
 
 	mutex_lock(&data->io_mutex);
+	if (data->zombie) {
+		retval = -ENODEV;
+		goto exit;
+	}
 
 	remaining = count;
 	done = 0;
@@ -496,6 +502,10 @@
 		return -ENOMEM;
 
 	mutex_lock(&data->io_mutex);
+	if (data->zombie) {
+		retval = -ENODEV;
+		goto exit;
+	}
 
 	remaining = count;
 	done = 0;
@@ -925,6 +935,10 @@
 
 	data = file->private_data;
 	mutex_lock(&data->io_mutex);
+	if (data->zombie) {
+		retval = -ENODEV;
+		goto skip_io_on_zombie;
+	}
 
 	switch (cmd) {
 	case USBTMC_IOCTL_CLEAR_OUT_HALT:
@@ -952,6 +966,7 @@
 		break;
 	}
 
+skip_io_on_zombie:
 	mutex_unlock(&data->io_mutex);
 	return retval;
 }
@@ -995,6 +1010,7 @@
 	usb_set_intfdata(intf, data);
 	kref_init(&data->kref);
 	mutex_init(&data->io_mutex);
+	data->zombie = 0;
 
 	/* Initialize USBTMC bTag and other fields */
 	data->bTag	= 1;
@@ -1065,6 +1081,9 @@
 	usb_deregister_dev(intf, &usbtmc_class);
 	sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
 	sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
+	mutex_lock(&data->io_mutex);
+	data->zombie = 1;
+	mutex_unlock(&data->io_mutex);
 	kref_put(&data->kref, usbtmc_delete);
 }