arm64: avoid prototype warnings for syscalls

[linux.git] / drivers / usb / serial / generic.c

diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index bc3cf66af0de0f6866258371961495ef4a221e8c..15b6dee3a8e503d428bacaf54cf8ebc629b68ef7 100644 (file)
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -247,11 +247,11 @@ unsigned int usb_serial_generic_write_room(struct tty_struct *tty)
        return room;
 }
 
-int usb_serial_generic_chars_in_buffer(struct tty_struct *tty)
+unsigned int usb_serial_generic_chars_in_buffer(struct tty_struct *tty)
 {
        struct usb_serial_port *port = tty->driver_data;
        unsigned long flags;
-       int chars;
+       unsigned int chars;
 
        if (!port->bulk_out_size)
                return 0;
@@ -260,7 +260,7 @@ int usb_serial_generic_chars_in_buffer(struct tty_struct *tty)
        chars = kfifo_len(&port->write_fifo) + port->tx_bytes;
        spin_unlock_irqrestore(&port->lock, flags);
 
-       dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
+       dev_dbg(&port->dev, "%s - returns %u\n", __func__, chars);
        return chars;
 }
 EXPORT_SYMBOL_GPL(usb_serial_generic_chars_in_buffer);