USB: fix usb-serial generic recursive lock

[linux-2.6-omap-h63xx.git] / drivers / usb / serial / generic.c

diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index 97fa3c4284350ab24a32cc9d46d69bc4e4fe39e2..7cfce9dabb9001c0f68bc68503c87e5bd07ed82a 100644 (file)
--- 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);