From a54164114b96b4693b42cdb553260eec41ea4393 Mon Sep 17 00:00:00 2001
From: Hiraku Toyooka <hiraku.toyooka.gu@hitachi.com>
Date: Wed, 19 Dec 2012 16:02:34 +0900
Subject: [PATCH] tracing: Add checks if tr->buffer is NULL in
 tracing_reset{_online_cpus}

max_tr->buffer could be NULL in the tracing_reset{_online_cpus}. In this
case, a NULL pointer dereference happens, so we should return immediately
from these functions.

Note, the current code does not call tracing_reset*() with max_tr when
its buffer is NULL, but future code will. This patch is needed to prevent
the future code from crashing.

Link: http://lkml.kernel.org/r/20121219070234.31200.93863.stgit@liselsia

Signed-off-by: Hiraku Toyooka <hiraku.toyooka.gu@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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