net/tls: use RCU for the adder to the offload record list

	tls_append_frag(record, &dummy_tag_frag, prot->tag_size);

	record->end_seq = tp->write_seq + record->len;

	spin_lock_irq(&offload_ctx->lock);

	list_add_tail(&record->list, &offload_ctx->records_list);

	spin_unlock_irq(&offload_ctx->lock);

	list_add_tail_rcu(&record->list, &offload_ctx->records_list);

	offload_ctx->open_record = NULL;

	if (test_bit(TLS_TX_SYNC_SCHED, &ctx->flags))

		/* if retransmit_hint is irrelevant start

		 * from the beggining of the list

		 */

		info = list_first_entry(&context->records_list,

		info = list_first_entry_or_null(&context->records_list,

						struct tls_record_info, list);

		if (!info)

			return NULL;

		record_sn = context->unacked_record_sn;

	}

	list_for_each_entry_from(info, &context->records_list, list) {

	/* We just need the _rcu for the READ_ONCE() */

	rcu_read_lock();

	list_for_each_entry_from_rcu(info, &context->records_list, list) {

		if (before(seq, info->end_seq)) {

			if (!context->retransmit_hint ||

			    after(info->end_seq,

				context->retransmit_hint = info;

			}

			*p_record_sn = record_sn;

			return info;

			goto exit_rcu_unlock;

		}

		record_sn++;

	}

	info = NULL;

	return NULL;

exit_rcu_unlock:

	rcu_read_unlock();

	return info;

}

EXPORT_SYMBOL(tls_get_record);