clk: sunxi-ng: common: Don't call hw_to_ccu_common on hw without common

In order to set the rate range of a hw sunxi_ccu_probe calls
hw_to_ccu_common() assuming all entries in desc->ccu_clks are contained
in a ccu_common struct. This assumption is incorrect and, in
consequence, causes invalid pointer de-references.

Remove the faulty call. Instead, add one more loop that iterates over
the ccu_clks and sets the rate range, if required.

Fixes: b914ec3 ("clk: sunxi-ng: common: Support minimum and maximum rate")
Reported-by: Robert J. Pafford <[email protected]>
Closes: https://lore.kernel.org/lkml/DM6PR01MB58047C810DDD5D0AE397CADFF7C22@DM6PR01MB5804.prod.exchangelabs.com/
Cc: [email protected]
Signed-off-by: Frank Oltmanns <[email protected]>
Tested-by: Robert J. Pafford <[email protected]>
Link: https://lore.kernel.org/r/20240623-sunxi-ng_fix_common_probe-v1-1-7c97e32824a1@oltmanns.dev
Signed-off-by: Chen-Yu Tsai <[email protected]>

Author: Frank Oltmanns

drivers/clk/sunxi-ng/ccu_common.c

@@ -132,7 +132,6 @@ static int sunxi_ccu_probe(struct sunxi_ccu *ccu, struct device *dev,
 
 	for (i = 0; i < desc->hw_clks->num ; i++) {
 		struct clk_hw *hw = desc->hw_clks->hws[i];
-		struct ccu_common *common = hw_to_ccu_common(hw);
 		const char *name;
 
 		if (!hw)
@@ -147,14 +146,21 @@ static int sunxi_ccu_probe(struct sunxi_ccu *ccu, struct device *dev,
 			pr_err("Couldn't register clock %d - %s\n", i, name);
 			goto err_clk_unreg;
 		}
+	}
+
+	for (i = 0; i < desc->num_ccu_clks; i++) {
+		struct ccu_common *cclk = desc->ccu_clks[i];
+
+		if (!cclk)
+			continue;
 
-		if (common->max_rate)
-			clk_hw_set_rate_range(hw, common->min_rate,
-					      common->max_rate);
+		if (cclk->max_rate)
+			clk_hw_set_rate_range(&cclk->hw, cclk->min_rate,
+					      cclk->max_rate);
 		else
-			WARN(common->min_rate,
+			WARN(cclk->min_rate,
 			     "No max_rate, ignoring min_rate of clock %d - %s\n",
-			     i, name);
+			     i, clk_hw_get_name(&cclk->hw));
 	}
 
 	ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get,