int clk_set_parent()

in clk/core.c [511:540]

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

int clk_set_parent(struct clk *clk, struct clk *parent)
{
	unsigned long flags;
	int ret = -EINVAL;

	if (!parent || !clk)
		return ret;
	if (clk->parent == parent)
		return 0;

	spin_lock_irqsave(&clock_lock, flags);
	if (clk->usecount == 0) {
		if (clk->ops->set_parent)
			ret = clk->ops->set_parent(clk, parent);
		else
			ret = clk_reparent(clk, parent);

		if (ret == 0) {
			if (clk->ops->recalc)
				clk->rate = clk->ops->recalc(clk);
			pr_debug("set parent of %p to %p (new rate %ld)\n",
				 clk, clk->parent, clk->rate);
			propagate_rate(clk);
		}
	} else
		ret = -EBUSY;
	spin_unlock_irqrestore(&clock_lock, flags);

	return ret;
}