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authorHans de Goede <hdegoede@redhat.com>2015-03-21 17:26:24 +0100
committerChanwoo Choi <cw00.choi@samsung.com>2015-03-23 11:06:04 +0900
commit66bee35f29683fc4a9a530a1c56a0ec45e3f7d72 (patch)
tree79f47f38f1a4802eb8ae789e1b4516b10a424135 /drivers/extcon/extcon.c
parentb9b518f53996b67833b42ca7751b2085b0dc565a (diff)
downloadlinux-stericsson-66bee35f29683fc4a9a530a1c56a0ec45e3f7d72.tar.gz
extcon: Fix missing locking when [un]registering notifiers
Since extcon.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 <hdegoede@redhat.com> [cw00.choi: Apply this patch to extcon.c driver instead of old extcon-class.c] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Diffstat (limited to 'drivers/extcon/extcon.c')
-rw-r--r--drivers/extcon/extcon.c35
1 files changed, 31 insertions, 4 deletions
diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
index 752ce1208428..4c9f165e4a04 100644
--- a/drivers/extcon/extcon.c
+++ b/drivers/extcon/extcon.c
@@ -445,6 +445,9 @@ 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;
@@ -462,8 +465,11 @@ 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;
@@ -496,10 +502,17 @@ 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);
@@ -516,7 +529,14 @@ 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);
@@ -528,7 +548,14 @@ 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);