1 files changed, 14 insertions, 2 deletions

diff --git a/include/linux/tty_ldisc.h b/include/linux/tty_ldisc.h
index a1b048999821..f15c898ff462 100644
--- a/include/linux/tty_ldisc.h
+++ b/include/linux/tty_ldisc.h
@@ -109,6 +109,17 @@
  *
  *      Tells the discipline that the DCD pin has changed its status.
  *      Used exclusively by the N_PPS (Pulse-Per-Second) line discipline.
+ *
+ * int  (*receive_buf2)(struct tty_struct *, const unsigned char *cp,
+ *                      char *fp, int count);
+ *
+ *      This function is called by the low-level tty driver to send
+ *      characters received by the hardware to the line discpline for
+ *      processing.  <cp> is a pointer to the buffer of input
+ *      character received by the device.  <fp> is a pointer to a
+ *      pointer of flag bytes which indicate whether a character was
+ *      received with a parity error, etc.
+ *      If assigned, prefer this function for automatic flow control.
  */
 
 #include <linux/fs.h>
@@ -195,6 +206,8 @@ struct tty_ldisc_ops {
         void    (*write_wakeup)(struct tty_struct *);
         void    (*dcd_change)(struct tty_struct *, unsigned int);
         void    (*fasync)(struct tty_struct *tty, int on);
+        int     (*receive_buf2)(struct tty_struct *, const unsigned char *cp,
+                                char *fp, int count);
 
         struct  module *owner;
 
@@ -203,8 +216,7 @@ struct tty_ldisc_ops {
 
 struct tty_ldisc {
         struct tty_ldisc_ops *ops;
-        atomic_t users;
-        wait_queue_head_t wq_idle;
+        struct tty_struct *tty;
 };
 
 #define TTY_LDISC_MAGIC 0x5403