diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index 17272701fab0..ba78635b0392 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -152,6 +152,7 @@ int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port,
 int usb_serial_generic_write_start(struct usb_serial_port *port,
 							gfp_t mem_flags)
 {
+	struct usb_serial_driver *type = port->serial->type;
 	struct urb *urb;
 	int count, result;
 	unsigned long flags;
@@ -161,7 +162,8 @@ int usb_serial_generic_write_start(struct usb_serial_port *port,
 		return 0;
 retry:
 	spin_lock_irqsave(&port->lock, flags);
-	if (!port->write_urbs_free || !kfifo_len(&port->write_fifo)) {
+	if (!port->write_urbs_free || !kfifo_len(&port->write_fifo) ||
+	    (type->write_ready && !type->write_ready(port))) {
 		clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags);
 		spin_unlock_irqrestore(&port->lock, flags);
 		return 0;
@@ -171,8 +173,7 @@ retry:
 	spin_unlock_irqrestore(&port->lock, flags);
 
 	urb = port->write_urbs[i];
-	count = port->serial->type->prepare_write_buffer(port,
-						urb->transfer_buffer,
+	count = type->prepare_write_buffer(port, urb->transfer_buffer,
 						port->bulk_out_size);
 	urb->transfer_buffer_length = count;
 	usb_serial_debug_data(&port->dev, __func__, count, urb->transfer_buffer);
@@ -188,6 +189,10 @@ retry:
 		set_bit(i, &port->write_urbs_free);
 		spin_lock_irqsave(&port->lock, flags);
 		port->tx_bytes -= count;
+
+		if (type->write_rollback)
+			type->write_rollback(port, count);
+
 		spin_unlock_irqrestore(&port->lock, flags);
 
 		clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags);
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index ab0a32a90629..5866f19d3c7b 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -305,9 +305,17 @@ struct usb_serial_driver {
 	void (*write_bulk_callback)(struct urb *urb);
 	/* Called by the generic read bulk callback */
 	void (*process_read_urb)(struct urb *urb);
+	/*
+	 * Called with port->lock held before preparing another write URB.
+	 * Drivers returning false must restart the generic write path when
+	 * writes may proceed again.
+	 */
+	bool (*write_ready)(struct usb_serial_port *port);
 	/* Called by the generic write implementation */
 	int (*prepare_write_buffer)(struct usb_serial_port *port,
 						void *dest, size_t size);
+	/* Called with port->lock held to roll back a failed write submission */
+	void (*write_rollback)(struct usb_serial_port *port, int count);
 };
 #define to_usb_serial_driver(d) \
 	container_of(d, struct usb_serial_driver, driver)