From: Peter Hurley <peter@hurleysoftware.com>
Date: Thu, 13 Jun 2013 19:56:37 +0000 (-0400)
Subject: tty: Fix transient pty write() EIO
X-Git-Tag: v3.10-rc7~4^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7c61c3d8f44d5d822f758754287af644307b4af9;p=pandora-kernel.git

tty: Fix transient pty write() EIO

Commit 699390354da6c258b65bf8fa79cfd5feaede50b6
('pty: Ignore slave pty close() if never successfully opened')
introduced a bug with ptys whereby a write() in parallel with an
open() on an existing pty could mistakenly indicate an I/O error.

Only indicate an I/O error if the condition on open() actually exists.

Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Tested-by: Mikael Pettersson <mikpe@it.uu.se>
Cc: stable <stable@vger.kernel.org> # 3.9
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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