From: Peter Hurley <peter@hurleysoftware.com>
Date: Wed, 6 Mar 2013 13:38:20 +0000 (-0500)
Subject: n_tty: Lock access to tty->pgrp for POSIX job control
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~136^2~103
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=01a5e440c91dc6065cf3dbc38aa7276fc4ce2f26;p=pandora-kernel.git

n_tty: Lock access to tty->pgrp for POSIX job control

Concurrent access to tty->pgrp must be protected with tty->ctrl_lock.
Also, as noted in the comments, reading current->signal->tty is
safe because either,
  1) current->signal->tty is assigned by current, or
  2) current->signal->tty is set to NULL.

NB: for reference, tty_check_change() implements a similar POSIX
check for the ioctls corresponding to tcflush(), tcdrain(),
tcsetattr(), tcsetpgrp(), tcflow() and tcsendbreak().

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

Reading git-diff-tree failed