From: Hiraku Toyooka <hiraku.toyooka.gu@hitachi.com>
Date: Wed, 19 Dec 2012 07:02:34 +0000 (+0900)
Subject: tracing: Add checks if tr->buffer is NULL in tracing_reset{_online_cpus}
X-Git-Tag: v3.9-rc1~173^2~18^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a54164114b96b4693b42cdb553260eec41ea4393;p=pandora-kernel.git

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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