USB: ir-usb: fix incorrect write-buffer length

Returned length should include header length.

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

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/usb/serial/ir-usb.c b/drivers/usb/serial/ir-usb.c
index e7087f9fe479..ccbce4066d04 100644
--- a/drivers/usb/serial/ir-usb.c
+++ b/drivers/usb/serial/ir-usb.c
@@ -307,6 +307,7 @@ static int ir_prepare_write_buffer(struct usb_serial_port *port,
                                                 void *dest, size_t size)
 {
         unsigned char *buf = dest;
+        int count;
 
         /*
          * The first byte of the packet we send to the device contains an
@@ -317,8 +318,9 @@ static int ir_prepare_write_buffer(struct usb_serial_port *port,
          */
         *buf = ir_xbof | ir_baud;
 
-        return kfifo_out_locked(&port->write_fifo, buf + 1, size - 1,
+        count = kfifo_out_locked(&port->write_fifo, buf + 1, size - 1,
                                                                 &port->lock);
+        return count + 1;
 }
 
 static void ir_process_read_urb(struct urb *urb)