USB: serial: refactor read urb submission in generic driver

Use the already exported function for submitting the read urb associated
with a usb_serial_port.

Make sure it returns the result of usb_submit_urb and rename to the
more descriptive usb_serial_generic_submit_read_urb.

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

1 files changed, 8 insertions, 24 deletions

diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index e1d245aa4a1d..d8dd3a59f56a 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -118,7 +118,6 @@ void usb_serial_generic_deregister(void)
 
 int usb_serial_generic_open(struct tty_struct *tty, struct usb_serial_port *port)
 {
-        struct usb_serial *serial = port->serial;
         int result = 0;
         unsigned long flags;
 
@@ -131,23 +130,8 @@ int usb_serial_generic_open(struct tty_struct *tty, struct usb_serial_port *port
         spin_unlock_irqrestore(&port->lock, flags);
 
         /* if we have a bulk endpoint, start reading from it */
-        if (port->bulk_in_size) {
-                /* Start reading from the device */
-                usb_fill_bulk_urb(port->read_urb, serial->dev,
-                                   usb_rcvbulkpipe(serial->dev,
-                                                port->bulk_in_endpointAddress),
-                                   port->read_urb->transfer_buffer,
-                                   port->read_urb->transfer_buffer_length,
-                                   ((serial->type->read_bulk_callback) ?
-                                     serial->type->read_bulk_callback :
-                                     usb_serial_generic_read_bulk_callback),
-                                   port);
-                result = usb_submit_urb(port->read_urb, GFP_KERNEL);
-                if (result)
-                        dev_err(&port->dev,
-                            "%s - failed resubmitting read urb, error %d\n",
-                                                        __func__, result);
-        }
+        if (port->bulk_in_size)
+                result = usb_serial_generic_submit_read_urb(port, GFP_KERNEL);
 
         return result;
 }
@@ -418,9 +402,8 @@ int usb_serial_generic_chars_in_buffer(struct tty_struct *tty)
         return chars;
 }
 
-
-void usb_serial_generic_resubmit_read_urb(struct usb_serial_port *port,
-                        gfp_t mem_flags)
+int usb_serial_generic_submit_read_urb(struct usb_serial_port *port,
+                                        gfp_t mem_flags)
 {
         struct urb *urb = port->read_urb;
         struct usb_serial *serial = port->serial;
@@ -439,11 +422,12 @@ void usb_serial_generic_resubmit_read_urb(struct usb_serial_port *port,
         result = usb_submit_urb(urb, mem_flags);
         if (result && result != -EPERM) {
                 dev_err(&port->dev,
-                        "%s - failed resubmitting read urb, error %d\n",
+                        "%s - failed submitting read urb, error %d\n",
                                                         __func__, result);
         }
+        return result;
 }
-EXPORT_SYMBOL_GPL(usb_serial_generic_resubmit_read_urb);
+EXPORT_SYMBOL_GPL(usb_serial_generic_submit_read_urb);
 
 /* Push data to tty layer and resubmit the bulk read URB */
 static void flush_and_resubmit_read_urb(struct usb_serial_port *port)
@@ -471,7 +455,7 @@ static void flush_and_resubmit_read_urb(struct usb_serial_port *port)
         tty_flip_buffer_push(tty);
         tty_kref_put(tty);
 done:
-        usb_serial_generic_resubmit_read_urb(port, GFP_ATOMIC);
+        usb_serial_generic_submit_read_urb(port, GFP_ATOMIC);
 }
 
 void usb_serial_generic_read_bulk_callback(struct urb *urb)