USB: serial: generalise generic read implementation

Add process_read_urb to usb_serial_driver so that a driver can rely on
the generic read (and throttle) mechanism but still do device specific
processing of incoming data (such as adding tty_flags before pushing to
line discipline).

The default generic implementation handles sysrq for consoles but
otherwise simply pushes to tty.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index 53f6dc65e87e..ff8872eba3ac 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -272,6 +272,8 @@ struct usb_serial_driver {
         void (*write_int_callback)(struct urb *urb);
         void (*read_bulk_callback)(struct urb *urb);
         void (*write_bulk_callback)(struct urb *urb);
+        /* Called by the generic read bulk callback */
+        void (*process_read_urb)(struct urb *urb);
 };
 #define to_usb_serial_driver(d) \
         container_of(d, struct usb_serial_driver, driver)
@@ -323,6 +325,7 @@ extern int usb_serial_generic_register(int debug);
 extern void usb_serial_generic_deregister(void);
 extern int usb_serial_generic_submit_read_urb(struct usb_serial_port *port,
                                                  gfp_t mem_flags);
+extern void usb_serial_generic_process_read_urb(struct urb *urb);
 extern int usb_serial_handle_sysrq_char(struct tty_struct *tty,
                                         struct usb_serial_port *port,
                                         unsigned int ch);