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n_tty: Ensure reader restarts worker for next reader

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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>
This commit is contained in:
Peter Hurley 2013-11-07 13:59:46 -05:00 committed by Greg Kroah-Hartman
parent 6ce4eac1f6
commit 42458f41d0
1 changed files with 3 additions and 2 deletions
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5
drivers/tty/n_tty.c
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@ -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;
}