From: Steven Rostedt <srostedt@redhat.com>
Date: Mon, 19 Dec 2011 23:44:44 +0000 (-0500)
Subject: ftrace: Fix ftrace hash record update with notrace
X-Git-Tag: v3.3-rc1~51^2~11^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c842e975520f8ab09e293cc92f51a1f396251fd5;p=pandora-kernel.git

ftrace: Fix ftrace hash record update with notrace

When disabling the "notrace" records, that means we want to trace them.
If the notrace_hash is zero, it means that we want to trace all
records. But to disable a zero notrace_hash means nothing.

The check for the notrace_hash count was incorrect with:

	if (hash && !hash->count)
		return

With the correct comment above it that states that we do nothing
if the notrace_hash has zero count. But !hash also means that
the notrace hash has zero count. I think this was done to
protect against dereferencing NULL. But if !hash is true, then
we go through the following loop without doing a single thing.

Fix it to:

	if (!hash || !hash->count)
		return;

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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