From: Peter Hurley <peter@hurleysoftware.com>
Date: Sat, 27 Jun 2015 13:21:32 +0000 (-0400)
Subject: n_tty: signal and flush atomically
X-Git-Tag: omap-for-v4.3/fixes-merge-window~185^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3b19e032295647b7be2aa3be62510db4aaeda759;p=pandora-kernel.git

n_tty: signal and flush atomically

When handling signalling char, claim the termios write lock before
signalling waiting readers and writers to prevent further i/o
before flushing the echo and output buffers. This prevents a
userspace signal handler which may output from racing the terminal
flush.

Reference: Bugzilla #99351 ("Output truncated in ssh session after...")
Fixes: commit d2b6f44779d3 ("n_tty: Fix signal handling flushes")
Reported-by: Filipe Brandenburger <filbranden@google.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

Reading git-diff-tree failed