static int parse_ev_cfg()

in mhi/core/init.c [639:720]

• 64 lines of code
• 10 McCabe index (conditional complexity)

static int parse_ev_cfg(struct mhi_controller *mhi_cntrl,
			const struct mhi_controller_config *config)
{
	struct mhi_event *mhi_event;
	const struct mhi_event_config *event_cfg;
	struct device *dev = mhi_cntrl->cntrl_dev;
	int i, num;

	num = config->num_events;
	mhi_cntrl->total_ev_rings = num;
	mhi_cntrl->mhi_event = kcalloc(num, sizeof(*mhi_cntrl->mhi_event),
				       GFP_KERNEL);
	if (!mhi_cntrl->mhi_event)
		return -ENOMEM;

	/* Populate event ring */
	mhi_event = mhi_cntrl->mhi_event;
	for (i = 0; i < num; i++) {
		event_cfg = &config->event_cfg[i];

		mhi_event->er_index = i;
		mhi_event->ring.elements = event_cfg->num_elements;
		mhi_event->intmod = event_cfg->irq_moderation_ms;
		mhi_event->irq = event_cfg->irq;

		if (event_cfg->channel != U32_MAX) {
			/* This event ring has a dedicated channel */
			mhi_event->chan = event_cfg->channel;
			if (mhi_event->chan >= mhi_cntrl->max_chan) {
				dev_err(dev,
					"Event Ring channel not available\n");
				goto error_ev_cfg;
			}

			mhi_event->mhi_chan =
				&mhi_cntrl->mhi_chan[mhi_event->chan];
		}

		/* Priority is fixed to 1 for now */
		mhi_event->priority = 1;

		mhi_event->db_cfg.brstmode = event_cfg->mode;
		if (MHI_INVALID_BRSTMODE(mhi_event->db_cfg.brstmode))
			goto error_ev_cfg;

		if (mhi_event->db_cfg.brstmode == MHI_DB_BRST_ENABLE)
			mhi_event->db_cfg.process_db = mhi_db_brstmode;
		else
			mhi_event->db_cfg.process_db = mhi_db_brstmode_disable;

		mhi_event->data_type = event_cfg->data_type;

		switch (mhi_event->data_type) {
		case MHI_ER_DATA:
			mhi_event->process_event = mhi_process_data_event_ring;
			break;
		case MHI_ER_CTRL:
			mhi_event->process_event = mhi_process_ctrl_ev_ring;
			break;
		default:
			dev_err(dev, "Event Ring type not supported\n");
			goto error_ev_cfg;
		}

		mhi_event->hw_ring = event_cfg->hardware_event;
		if (mhi_event->hw_ring)
			mhi_cntrl->hw_ev_rings++;
		else
			mhi_cntrl->sw_ev_rings++;

		mhi_event->cl_manage = event_cfg->client_managed;
		mhi_event->offload_ev = event_cfg->offload_channel;
		mhi_event++;
	}

	return 0;

error_ev_cfg:

	kfree(mhi_cntrl->mhi_event);
	return -EINVAL;
}