int sbefifo_submit()

in fsi-sbefifo.c [729:766]

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

int sbefifo_submit(struct device *dev, const __be32 *command, size_t cmd_len,
		   __be32 *response, size_t *resp_len)
{
	struct sbefifo *sbefifo;
        struct iov_iter resp_iter;
        struct kvec resp_iov;
	size_t rbytes;
	int rc;

	if (!dev)
		return -ENODEV;
	sbefifo = dev_get_drvdata(dev);
	if (!sbefifo)
		return -ENODEV;
	if (WARN_ON_ONCE(sbefifo->magic != SBEFIFO_MAGIC))
		return -ENODEV;
	if (!resp_len || !command || !response)
		return -EINVAL;

	/* Prepare iov iterator */
	rbytes = (*resp_len) * sizeof(__be32);
	resp_iov.iov_base = response;
	resp_iov.iov_len = rbytes;
        iov_iter_kvec(&resp_iter, WRITE, &resp_iov, 1, rbytes);

	/* Perform the command */
	rc = mutex_lock_interruptible(&sbefifo->lock);
	if (rc)
		return rc;
	rc = __sbefifo_submit(sbefifo, command, cmd_len, &resp_iter);
	mutex_unlock(&sbefifo->lock);

	/* Extract the response length */
	rbytes -= iov_iter_count(&resp_iter);
	*resp_len = rbytes / sizeof(__be32);

	return rc;
}