linux-kernel - [PATCH] extcon: class: Add NULL pointer checking for removing notifier block.

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Message-id: <1371175897-3001-1-git-send-email-jonghwa3.lee@samsung.com>
Date:	Fri, 14 Jun 2013 11:11:37 +0900
From:	Jonghwa Lee <jonghwa3.lee@...sung.com>
To:	linux-pm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Jonghwa Lee <jonghwa3.lee@...sung.com>
Subject: [PATCH] extcon: class: Add NULL pointer checking for removing notifier
 block.

This patch adds NULL pointer checking of extcon device to 'extcon_unregister
_interest' which unregisters extcon notifier block.

Signed-off-by: Jonghwa Lee <jonghwa3.lee@...sung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@...sung.com>
---
 drivers/extcon/extcon-class.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
index 8c69803..23f11ea 100644
--- a/drivers/extcon/extcon-class.c
+++ b/drivers/extcon/extcon-class.c
@@ -491,7 +491,7 @@ EXPORT_SYMBOL_GPL(extcon_register_interest);
  */
 int extcon_unregister_interest(struct extcon_specific_cable_nb *obj)
 {
-	if (!obj)
+	if (!obj || !obj->edev)
 		return -EINVAL;
 
 	return raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb);
-- 
1.7.9.5

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