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NFC: mutex_lock is called in atomic_notifier_chain callback

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Hi Lauro, Samuel, Aloisio,

I think there might be a problem in the netlink notifier in the NFC subsystem.

The function mutex_lock (which might sleep) is called in the function nfc_genl_rcv_nl_event.
As far as I understand, the function nfc_genl_rcv_nl_event can be executed in atomic context (since it's registered via atomic_notifier_chain_register in af_netlink.c).

I'll appreciate your comments on this issue.

Thanks & BR,
Ilan
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