static int cs_hsi_buf_config()

in clients/cmt_speech.c [924:982]

• 44 lines of code
• 8 McCabe index (conditional complexity)

static int cs_hsi_buf_config(struct cs_hsi_iface *hi,
					struct cs_buffer_config *buf_cfg)
{
	int r = 0;
	unsigned int old_state = hi->iface_state;

	spin_lock_bh(&hi->lock);
	/* Prevent new transactions during buffer reconfig */
	if (old_state == CS_STATE_CONFIGURED)
		hi->iface_state = CS_STATE_OPENED;
	spin_unlock_bh(&hi->lock);

	/*
	 * make sure that no non-zero data reads are ongoing before
	 * proceeding to change the buffer layout
	 */
	r = cs_hsi_data_sync(hi);
	if (r < 0)
		return r;

	WARN_ON(cs_state_xfer_active(hi->data_state));

	spin_lock_bh(&hi->lock);
	r = check_buf_params(hi, buf_cfg);
	if (r < 0)
		goto error;

	hi->buf_size = buf_cfg->buf_size;
	hi->mmap_cfg->buf_size = hi->buf_size;
	hi->flags = buf_cfg->flags;

	hi->rx_slot = 0;
	hi->tx_slot = 0;
	hi->slot_size = 0;

	if (hi->buf_size)
		cs_hsi_data_enable(hi, buf_cfg);
	else
		cs_hsi_data_disable(hi, old_state);

	spin_unlock_bh(&hi->lock);

	if (old_state != hi->iface_state) {
		if (hi->iface_state == CS_STATE_CONFIGURED) {
			cpu_latency_qos_add_request(&hi->pm_qos_req,
				CS_QOS_LATENCY_FOR_DATA_USEC);
			local_bh_disable();
			cs_hsi_read_on_data(hi);
			local_bh_enable();
		} else if (old_state == CS_STATE_CONFIGURED) {
			cpu_latency_qos_remove_request(&hi->pm_qos_req);
		}
	}
	return r;

error:
	spin_unlock_bh(&hi->lock);
	return r;
}