Commit 42458f41 authored Nov 07, 2013 by Peter Hurley Committed by Greg Kroah-Hartman Nov 25, 2013

n_tty: Ensure reader restarts worker for next reader



A departing reader must restart a flush_to_ldisc() worker _before_
the next reader enters the read loop; this is to avoid the new reader
concluding no more i/o is available and prematurely exiting, when the
old reader simply hasn't re-started the worker yet.

Cc: stable <stable@vger.kernel.org> # 3.12
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 6ce4eac1

drivers/tty/n_tty.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -2243,6 +2243,9 @@ static ssize_t n_tty_read(struct tty_struct tty, struct file file,
		if (time)
		timeout = time;
		}
		n_tty_set_room(tty);
		up_read(&tty->termios_rwsem);

		mutex_unlock(&ldata->atomic_read_lock);
		remove_wait_queue(&tty->read_wait, &wait);

		@@ -2253,8 +2256,6 @@ static ssize_t n_tty_read(struct tty_struct tty, struct file file,
		if (b - buf)
		retval = b - buf;

		n_tty_set_room(tty);
		up_read(&tty->termios_rwsem);
		return retval;
		}