From mboxrd@z Thu Jan 1 00:00:00 1970 From: hdegoede@redhat.com (Hans de Goede) Date: Sat, 21 Mar 2015 17:26:24 +0100 Subject: [PATCH] extcon: Fix missing locking when [un]registering notifiers Message-ID: <1426955184-3727-1-git-send-email-hdegoede@redhat.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Since extcon-class.c is using raw_notifiers it must protect the notifier list itself when [un]registering notifiers to avoid the list changing while extcon_update_state is walking the list (through raw_notifier_call_chain). Signed-off-by: Hans de Goede --- drivers/extcon/extcon-class.c | 35 +++++++++++++++++++++++++++++++---- 1 file changed, 31 insertions(+), 4 deletions(-) diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c index 8319f25..b079c41 100644 --- a/drivers/extcon/extcon-class.c +++ b/drivers/extcon/extcon-class.c @@ -444,6 +444,9 @@ int extcon_register_interest(struct extcon_specific_cable_nb *obj, const char *extcon_name, const char *cable_name, struct notifier_block *nb) { + unsigned long flags; + int ret; + if (!obj || !cable_name || !nb) return -EINVAL; @@ -461,8 +464,11 @@ int extcon_register_interest(struct extcon_specific_cable_nb *obj, obj->internal_nb.notifier_call = _call_per_cable; - return raw_notifier_chain_register(&obj->edev->nh, + spin_lock_irqsave(&obj->edev->lock, flags); + ret = raw_notifier_chain_register(&obj->edev->nh, &obj->internal_nb); + spin_unlock_irqrestore(&obj->edev->lock, flags); + return ret; } else { struct class_dev_iter iter; struct extcon_dev *extd; @@ -495,10 +501,17 @@ EXPORT_SYMBOL_GPL(extcon_register_interest); */ int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) { + unsigned long flags; + int ret; + if (!obj) return -EINVAL; - return raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb); + spin_lock_irqsave(&obj->edev->lock, flags); + ret = raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb); + spin_unlock_irqrestore(&obj->edev->lock, flags); + + return ret; } EXPORT_SYMBOL_GPL(extcon_unregister_interest); @@ -515,7 +528,14 @@ EXPORT_SYMBOL_GPL(extcon_unregister_interest); int extcon_register_notifier(struct extcon_dev *edev, struct notifier_block *nb) { - return raw_notifier_chain_register(&edev->nh, nb); + unsigned long flags; + int ret; + + spin_lock_irqsave(&edev->lock, flags); + ret = raw_notifier_chain_register(&edev->nh, nb); + spin_unlock_irqrestore(&edev->lock, flags); + + return ret; } EXPORT_SYMBOL_GPL(extcon_register_notifier); @@ -527,7 +547,14 @@ EXPORT_SYMBOL_GPL(extcon_register_notifier); int extcon_unregister_notifier(struct extcon_dev *edev, struct notifier_block *nb) { - return raw_notifier_chain_unregister(&edev->nh, nb); + unsigned long flags; + int ret; + + spin_lock_irqsave(&edev->lock, flags); + ret = raw_notifier_chain_unregister(&edev->nh, nb); + spin_unlock_irqrestore(&edev->lock, flags); + + return ret; } EXPORT_SYMBOL_GPL(extcon_unregister_notifier); -- 2.3.3