1 files changed, 6 insertions, 4 deletions

diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index 97fa3c428435..7cfce9dabb90 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -323,7 +323,7 @@ static void flush_and_resubmit_read_urb (struct usb_serial_port *port)
                 room = tty_buffer_request_room(tty, urb->actual_length);
                 if (room) {
                         tty_insert_flip_string(tty, urb->transfer_buffer, room);
-                        tty_flip_buffer_push(tty); /* is this allowed from an URB callback ? */
+                        tty_flip_buffer_push(tty);
                 }
         }
 
@@ -349,10 +349,12 @@ void usb_serial_generic_read_bulk_callback (struct urb *urb)
 
         /* Throttle the device if requested by tty */
         spin_lock_irqsave(&port->lock, flags);
-        if (!(port->throttled = port->throttle_req))
-                /* Handle data and continue reading from device */
+        if (!(port->throttled = port->throttle_req)) {
+                spin_unlock_irqrestore(&port->lock, flags);
                 flush_and_resubmit_read_urb(port);
-        spin_unlock_irqrestore(&port->lock, flags);
+        } else {
+                spin_unlock_irqrestore(&port->lock, flags);
+        }
 }
 EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback);