static int altera_cvp_write()

in altera-cvp.c [431:482]

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

static int altera_cvp_write(struct fpga_manager *mgr, const char *buf,
			    size_t count)
{
	struct altera_cvp_conf *conf = mgr->priv;
	size_t done, remaining, len;
	const u32 *data;
	int status = 0;

	/* STEP 9 - write 32-bit data from RBF file to CVP data register */
	data = (u32 *)buf;
	remaining = count;
	done = 0;

	while (remaining) {
		/* Use credit throttling if available */
		if (conf->priv->wait_credit) {
			status = conf->priv->wait_credit(mgr, done);
			if (status) {
				dev_err(&conf->pci_dev->dev,
					"Wait Credit ERR: 0x%x\n", status);
				return status;
			}
		}

		len = min(conf->priv->block_size, remaining);
		altera_cvp_send_block(conf, data, len);
		data += len / sizeof(u32);
		done += len;
		remaining -= len;
		conf->sent_packets++;

		/*
		 * STEP 10 (optional) and STEP 11
		 * - check error flag
		 * - loop until data transfer completed
		 * Config images can be huge (more than 40 MiB), so
		 * only check after a new 4k data block has been written.
		 * This reduces the number of checks and speeds up the
		 * configuration process.
		 */
		if (altera_cvp_chkcfg && !(done % SZ_4K)) {
			status = altera_cvp_chk_error(mgr, done);
			if (status < 0)
				return status;
		}
	}

	if (altera_cvp_chkcfg)
		status = altera_cvp_chk_error(mgr, count);

	return status;
}