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extcon: Check for incorrect connection type in notifier register 

If we call extcon_register_notifier() with the wrong cable type,
it blows up with an oops instead of returning an error code.
Let's be nice and fail gracefully given that the consumer might
not know if the cable is supported by the extcon provider.

Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Stephen Boyd 2016-06-23 19:34:30 +09:00 committed by Chanwoo Choi
parent 70a7da4587
commit a05f44c89e
1 changed files with 4 additions and 0 deletions
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4
drivers/extcon/extcon.c
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@ -415,6 +415,8 @@ int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
if (edev) {
idx = find_cable_index_by_id(edev, id);
if (idx < 0)
return idx;
spin_lock_irqsave(&edev->lock, flags);
ret = raw_notifier_chain_register(&edev->nh[idx], nb);
@ -458,6 +460,8 @@ int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
return -EINVAL;
idx = find_cable_index_by_id(edev, id);
if (idx < 0)
return idx;
spin_lock_irqsave(&edev->lock, flags);
ret = raw_notifier_chain_unregister(&edev->nh[idx], nb);