Commit 6c67716d authored by Peter Hurley's avatar Peter Hurley Committed by Greg Kroah-Hartman

n_tty: Only perform wakeups for waiters

Only wakeup the _waiting_ reader, polls and/or writer(s).
Signed-off-by: default avatarPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent eafbe67f
......@@ -274,7 +274,8 @@ static void n_tty_check_unthrottle(struct tty_struct *tty)
return;
n_tty_set_room(tty);
n_tty_write_wakeup(tty->link);
wake_up_interruptible_poll(&tty->link->write_wait, POLLOUT);
if (waitqueue_active(&tty->link->write_wait))
wake_up_interruptible_poll(&tty->link->write_wait, POLLOUT);
return;
}
......@@ -349,7 +350,8 @@ static void n_tty_packet_mode_flush(struct tty_struct *tty)
spin_lock_irqsave(&tty->ctrl_lock, flags);
if (tty->link->packet) {
tty->ctrl_status |= TIOCPKT_FLUSHREAD;
wake_up_interruptible(&tty->link->read_wait);
if (waitqueue_active(&tty->link->read_wait))
wake_up_interruptible(&tty->link->read_wait);
}
spin_unlock_irqrestore(&tty->ctrl_lock, flags);
}
......@@ -1155,7 +1157,8 @@ static void n_tty_receive_break(struct tty_struct *tty)
put_tty_queue('\0', ldata);
}
put_tty_queue('\0', ldata);
wake_up_interruptible(&tty->read_wait);
if (waitqueue_active(&tty->read_wait))
wake_up_interruptible(&tty->read_wait);
}
/**
......@@ -1213,7 +1216,8 @@ static void n_tty_receive_parity_error(struct tty_struct *tty, unsigned char c)
put_tty_queue('\0', ldata);
else
put_tty_queue(c, ldata);
wake_up_interruptible(&tty->read_wait);
if (waitqueue_active(&tty->read_wait))
wake_up_interruptible(&tty->read_wait);
}
static void
......@@ -1802,8 +1806,10 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
start_tty(tty);
/* The termios change make the tty ready for I/O */
wake_up_interruptible(&tty->write_wait);
wake_up_interruptible(&tty->read_wait);
if (waitqueue_active(&tty->write_wait))
wake_up_interruptible(&tty->write_wait);
if (waitqueue_active(&tty->read_wait))
wake_up_interruptible(&tty->read_wait);
}
/**
......
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