static int i3c_hci_priv_xfers()

in master/mipi-i3c-hci/core.c [271:329]

• 52 lines of code
• 11 McCabe index (conditional complexity)

static int i3c_hci_priv_xfers(struct i3c_dev_desc *dev,
			      struct i3c_priv_xfer *i3c_xfers,
			      int nxfers)
{
	struct i3c_master_controller *m = i3c_dev_get_master(dev);
	struct i3c_hci *hci = to_i3c_hci(m);
	struct hci_xfer *xfer;
	DECLARE_COMPLETION_ONSTACK(done);
	unsigned int size_limit;
	int i, last, ret = 0;

	DBG("nxfers = %d", nxfers);

	xfer = hci_alloc_xfer(nxfers);
	if (!xfer)
		return -ENOMEM;

	size_limit = 1U << (16 + FIELD_GET(HC_CAP_MAX_DATA_LENGTH, hci->caps));

	for (i = 0; i < nxfers; i++) {
		xfer[i].data_len = i3c_xfers[i].len;
		ret = -EFBIG;
		if (xfer[i].data_len >= size_limit)
			goto out;
		xfer[i].rnw = i3c_xfers[i].rnw;
		if (i3c_xfers[i].rnw) {
			xfer[i].data = i3c_xfers[i].data.in;
		} else {
			/* silence the const qualifier warning with a cast */
			xfer[i].data = (void *) i3c_xfers[i].data.out;
		}
		hci->cmd->prep_i3c_xfer(hci, dev, &xfer[i]);
		xfer[i].cmd_desc[0] |= CMD_0_ROC;
	}
	last = i - 1;
	xfer[last].cmd_desc[0] |= CMD_0_TOC;
	xfer[last].completion = &done;

	ret = hci->io->queue_xfer(hci, xfer, nxfers);
	if (ret)
		goto out;
	if (!wait_for_completion_timeout(&done, HZ) &&
	    hci->io->dequeue_xfer(hci, xfer, nxfers)) {
		ret = -ETIME;
		goto out;
	}
	for (i = 0; i < nxfers; i++) {
		if (i3c_xfers[i].rnw)
			i3c_xfers[i].len = RESP_DATA_LENGTH(xfer[i].response);
		if (RESP_STATUS(xfer[i].response) != RESP_SUCCESS) {
			ret = -EIO;
			goto out;
		}
	}

out:
	hci_free_xfer(xfer, nxfers);
	return ret;
}