tree fd31a291d7f076ba1776cb490ae0baa75f54c712
parent fb78b811422cd2d8c8605949cc4cc13618347ad5
author Peter Hurley <peter@hurleysoftware.com> 1392154495 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1392314539 -0800

n_tty: Fix stale echo output

When echoes cannot be flushed to output (usually because the tty
has no more write room) and L_ECHO is subsequently turned off, then
when L_ECHO is turned back on, stale echoes are output.

Output completed echoes regardless of the L_ECHO setting:
  1. before normal writes to that tty
  2. if the tty was stopped by soft flow control and is being
     restarted

Reported-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: <stable@vger.kernel.org> # 3.13.x
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>