From: Peter Hurley <peter@hurleysoftware.com>
Date: Tue, 11 Feb 2014 23:55:30 +0000 (-0500)
Subject: n_tty: Simplify input_available_p()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=25e8d0ed75a6b3e7c2f533f0460a48f903d94269;p=linux-beck.git

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>
---

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;
 }
 
 /**