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Bluetooth: RFCOMM: Replace use of memcpy_from_msg with bt_skb_sendmmsg
This makes use of bt_skb_sendmmsg instead using memcpy_from_msg which is not considered safe to be used when lock_sock is held. Also make rfcomm_dlc_send handle skb with fragments and queue them all atomically. Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
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