[PATCH] extcon: class: Add NULL pointer checking for removing notifierblock.

[Jonghwa Lee]

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@xxxxxxxxxxx>
Signed-off-by: Myungjoo Ham <myungjoo.ham@xxxxxxxxxxx>
---
 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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