From d6d3523caab75196560c85aae80cb8f4a8e380ea Mon Sep 17 00:00:00 2001
From: "Geyslan G. Bem" <geyslan@gmail.com>
Date: Wed, 6 Nov 2013 16:02:51 -0300
Subject: [PATCH] tracing: Do not assign filp->private_data to freed memory

In system_tr_open(), the filp->private_data can be assigned the 'dir'
variable even if it was freed. This is on the error path, and is
harmless because the error return code will prevent filp->private_data
from being used. But for correctness, we should not assign it to
a recently freed variable, as that can cause static tools to give
false warnings.

Also have both subsystem_open() and system_tr_open() return -ENODEV
if tracing has been disabled.

Link: http://lkml.kernel.org/r/1383764571-7318-1-git-send-email-geyslan@gmail.com

Signed-off-by: Geyslan G. Bem <geyslan@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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