From abaa03b0d6f1442c236ee0a667f7e14f129fd67c Mon Sep 17 00:00:00 2001
From: Sasha Levin <sasha.levin@oracle.com>
Date: Tue, 22 Dec 2015 12:43:36 -0500
Subject: [PATCH] power: test_power: correctly handle empty writes

commit 6b9140f39c2aaf76791197fbab0839c0e4af56e8 upstream.

Writing 0 length data into test_power makes it access an invalid array
location and kill the system.

Fixes: f17ef9b2d ("power: Make test_power driver more dynamic.")
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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Reading git-format-patch failed