linux-kernel - [PATCH 2/2] power: charger-manager: Fix a bug when it unregisters notifier block of extcon.

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Date:	Tue, 25 Jun 2013 14:02:49 +0900
From:	Jonghwa Lee <jonghwa3.lee@...sung.com>
To:	anton.vorontsov@...aro.org
Cc:	linux-kernel@...r.kernel.org,
	Jonghwa Lee <jonghwa3.lee@...sung.com>,
	Myungjoo Ham <myungjoo.ham@...sung.com>
Subject: [PATCH 2/2] power: charger-manager: Fix a bug when it unregisters
 notifier block of extcon.

This patch prevents NULL pointer error cauesed by unregistering unregistered
exton notifier block. At the probing time of charger manager, it tries to
remove extcon notifier block when it fails to initialize them. It has to be
applied for only registered one. Otherwise, it'd make kernel panic. To make it
work right, it checks extcon_specific_cable_nb's extcon_dev node. If extcon
cable notifier block was registered successfully, it has proper extcon_dev
pointer if not so it has NULL pointer.

Signed-off-by: Jonghwa Lee <jonghwa3.lee@...sung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@...sung.com>
---
 drivers/power/charger-manager.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/power/charger-manager.c b/drivers/power/charger-manager.c
index 7d1bcde..c55a7dc 100644
--- a/drivers/power/charger-manager.c
+++ b/drivers/power/charger-manager.c
@@ -1666,7 +1666,9 @@ err_reg_extcon:
 		charger = &desc->charger_regulators[i];
 		for (j = 0; j < charger->num_cables; j++) {
 			struct charger_cable *cable = &charger->cables[j];
-			extcon_unregister_interest(&cable->extcon_dev);
+			/* Remove notifier block if only edev exists */
+			if (cable->extcon_dev.edev)
+				extcon_unregister_interest(&cable->extcon_dev);
 		}
 
 		regulator_put(desc->charger_regulators[i].consumer);
-- 
1.7.9.5

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