int clk_register()

in clk/core.c [411:449]

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

int clk_register(struct clk *clk)
{
	int ret;

	if (IS_ERR_OR_NULL(clk))
		return -EINVAL;

	/*
	 * trap out already registered clocks
	 */
	if (clk->node.next || clk->node.prev)
		return 0;

	mutex_lock(&clock_list_sem);

	INIT_LIST_HEAD(&clk->children);
	clk->usecount = 0;

	ret = clk_establish_mapping(clk);
	if (unlikely(ret))
		goto out_unlock;

	if (clk->parent)
		list_add(&clk->sibling, &clk->parent->children);
	else
		list_add(&clk->sibling, &root_clks);

	list_add(&clk->node, &clock_list);

#ifdef CONFIG_SH_CLK_CPG_LEGACY
	if (clk->ops && clk->ops->init)
		clk->ops->init(clk);
#endif

out_unlock:
	mutex_unlock(&clock_list_sem);

	return ret;
}