[PATCH v7 2/3] clk: introduce the common clock framework

On Mon, Mar 19, 2012 at 04:52:05PM +0530, Rajendra Nayak wrote:

Hi Mike,

quoted

+/*
+ * calculate the new rates returning the topmost clock that has to be
+ * changed.
+ */
+static struct clk *clk_calc_new_rates(struct clk *clk, unsigned long rate)
+{
+	struct clk *top = clk;
+	unsigned long best_parent_rate = clk->parent->rate;

Shouldn't you check for a valid parent before dereferencing it? A
clk_set_rate() on a root clock might throw up some issues otherwise.

Yes, should be checked.

quoted

+	unsigned long new_rate;
+
+	if (!clk->ops->round_rate&&  !(clk->flags&  CLK_SET_RATE_PARENT)) {
+		clk->new_rate = clk->rate;
+		return NULL;

So does this mean a clk_set_rate() fails for a clk which does not have
a valid .round_rate and does not have a CLK_SET_RATE_PARENT flag set?
I was thinking this could do a..
		clk->new_rate = rate;
		top = clk;
		goto out;
..instead.

The core should make sure that either both set_rate and round_rate are
present or none of them.

Sascha

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