From ffb91a459c6cacb10972f5dff893fb1292bac85d Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@hurleysoftware.com>
Date: Sat, 9 Jan 2016 21:45:13 -0800
Subject: [PATCH] n_tty: Remove tty count checks from unthrottle
Since n_tty_check_unthrottle() is only called from n_tty_read()
which only originates from a userspace read(), the tty count cannot
be 0; the read() guarantees the file descriptor has not yet been
released.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/tty/n_tty.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 086fd9983caa..5ae661cd236e 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -261,8 +261,6 @@ static void n_tty_check_unthrottle(struct tty_struct *tty)
if (tty->driver->type == TTY_DRIVER_TYPE_PTY) {
if (chars_in_buffer(tty) > TTY_THRESHOLD_UNTHROTTLE)
return;
- if (!tty->count)
- return;
n_tty_kick_worker(tty);
tty_wakeup(tty->link);
return;
@@ -281,8 +279,6 @@ static void n_tty_check_unthrottle(struct tty_struct *tty)
tty_set_flow_change(tty, TTY_UNTHROTTLE_SAFE);
if (chars_in_buffer(tty) > TTY_THRESHOLD_UNTHROTTLE)
break;
- if (!tty->count)
- break;
n_tty_kick_worker(tty);
unthrottled = tty_unthrottle_safe(tty);
if (!unthrottled)