1 files changed, 34 insertions, 2 deletions

diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index 4267a9c717ba..fbb666b1b670 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -300,8 +300,10 @@ struct usb_serial_driver {
 #define to_usb_serial_driver(d) \
         container_of(d, struct usb_serial_driver, driver)
 
-extern int  usb_serial_register(struct usb_serial_driver *driver);
-extern void usb_serial_deregister(struct usb_serial_driver *driver);
+extern int usb_serial_register_drivers(struct usb_driver *udriver,
+                struct usb_serial_driver * const serial_drivers[]);
+extern void usb_serial_deregister_drivers(struct usb_driver *udriver,
+                struct usb_serial_driver * const serial_drivers[]);
 extern void usb_serial_port_softint(struct usb_serial_port *port);
 
 extern int usb_serial_probe(struct usb_interface *iface,
@@ -389,5 +391,35 @@ do {									\
                 printk(KERN_DEBUG "%s: " format "\n", __FILE__, ##arg); \
 } while (0)
 
+/*
+ * Macro for reporting errors in write path to avoid inifinite loop
+ * when port is used as a console.
+ */
+#define dev_err_console(usport, fmt, ...)                               \
+do {                                                                    \
+        static bool __print_once;                                       \
+        struct usb_serial_port *__port = (usport);                      \
+                                                                        \
+        if (!__port->port.console || !__print_once) {                   \
+                __print_once = true;                                    \
+                dev_err(&__port->dev, fmt, ##__VA_ARGS__);              \
+        }                                                               \
+} while (0)
+
+/*
+ * module_usb_serial_driver() - Helper macro for registering a USB Serial driver
+ * @__usb_driver: usb_driver struct to register
+ * @__serial_drivers: list of usb_serial drivers to register
+ *
+ * Helper macro for USB serial drivers which do not do anything special
+ * in module init/exit. This eliminates a lot of boilerplate. Each
+ * module may only use this macro once, and calling it replaces
+ * module_init() and module_exit()
+ *
+ */
+#define module_usb_serial_driver(__usb_driver, __serial_drivers)        \
+        module_driver(__usb_driver, usb_serial_register_drivers,        \
+                       usb_serial_deregister_drivers, __serial_drivers)
+
 #endif /* __LINUX_USB_SERIAL_H */