int cxl_query_cmd()

in core/mbox.c [321:353]

• 21 lines of code
• 5 McCabe index (conditional complexity)

int cxl_query_cmd(struct cxl_memdev *cxlmd,
		  struct cxl_mem_query_commands __user *q)
{
	struct device *dev = &cxlmd->dev;
	struct cxl_mem_command *cmd;
	u32 n_commands;
	int j = 0;

	dev_dbg(dev, "Query IOCTL\n");

	if (get_user(n_commands, &q->n_commands))
		return -EFAULT;

	/* returns the total number if 0 elements are requested. */
	if (n_commands == 0)
		return put_user(ARRAY_SIZE(cxl_mem_commands), &q->n_commands);

	/*
	 * otherwise, return max(n_commands, total commands) cxl_command_info
	 * structures.
	 */
	cxl_for_each_cmd(cmd) {
		const struct cxl_command_info *info = &cmd->info;

		if (copy_to_user(&q->commands[j++], info, sizeof(*info)))
			return -EFAULT;

		if (j == n_commands)
			break;
	}

	return 0;
}