From b6cace3df1f501c89dbc91daa90008b40f04938c Mon Sep 17 00:00:00 2001
From: Florian Pose <fp@igh.de>
Date: Tue, 18 Oct 2016 10:20:21 +0200
Subject: [PATCH] Support changed tty_prepare_flip_string() interface from
 kernel 3.9.

---
 tty/module.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tty/module.c b/tty/module.c
index f512c6b3..48058a9d 100644
--- a/tty/module.c
+++ b/tty/module.c
@@ -337,7 +337,11 @@ void ec_tty_wakeup(unsigned long data)
     to_recv = ec_tty_rx_size(tty);
     if (to_recv && tty->tty) {
         unsigned char *cbuf;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 9, 0)
+        int space = tty_prepare_flip_string(tty->tty->port, &cbuf, to_recv);
+#else
         int space = tty_prepare_flip_string(tty->tty, &cbuf, to_recv);
+#endif
 
         if (space < to_recv) {
             printk(KERN_WARNING PFX "Insufficient space to_recv=%d space=%d\n",
@@ -362,7 +366,11 @@ void ec_tty_wakeup(unsigned long data)
                 tty->rx_read_idx =
                     (tty->rx_read_idx + 1) % EC_TTY_RX_BUFFER_SIZE;
             }
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 9, 0)
+            tty_flip_buffer_push(tty->tty->port);
+#else
             tty_flip_buffer_push(tty->tty);
+#endif
         }
     }