From 98a1fb97fe6f6b40e008669070de090fb6c87d62 Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Date: Thu, 12 Mar 2015 08:44:00 +0100
Subject: [PATCH] compal-laptop: Check return value of power_supply_register

commit 1915a718b1872edffcb13e5436a9f7302d3d36f0 upstream.

The return value of power_supply_register() call was not checked and
even on error probe() function returned 0. If registering failed then
during unbind the driver tried to unregister power supply which was not
actually registered.

This could lead to memory corruption because power_supply_unregister()
unconditionally cleans up given power supply.

Fix this by checking return status of power_supply_register() call. In
case of failure, clean up sysfs entries and fail the probe.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Fixes: 9be0fcb5ed46 ("compal-laptop: add JHL90, battery & hwmon interface")
Signed-off-by: Sebastian Reichel <sre@kernel.org>
[bwh: Backported to 3.2: insert the appropriate cleanup code as there is no
 common 'remove' label]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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