n_tty: Simplify input_available_p()

Greg,

Please note this patch requires
   n_tty: Fix poll() when TIME_CHAR and MIN_CHAR == 0

Regards,
Peter Hurley

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 7 deletions

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index d15624c1b751..41fe8a047d37 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -1900,13 +1900,10 @@ static inline int input_available_p(struct tty_struct *tty, int poll)
         struct n_tty_data *ldata = tty->disc_data;
         int amt = poll && !TIME_CHAR(tty) && MIN_CHAR(tty) ? MIN_CHAR(tty) : 1;
 
-        if (ldata->icanon && !L_EXTPROC(tty)) {
-                if (ldata->canon_head != ldata->read_tail)
-                        return 1;
-        } else if (read_cnt(ldata) >= amt)
-                return 1;
-
-        return 0;
+        if (ldata->icanon && !L_EXTPROC(tty))
+                return ldata->canon_head != ldata->read_tail;
+        else
+                return read_cnt(ldata) >= amt;
 }
 
 /**