soc: ti: pruss: do device_node auto cleanup

Use scope based cleanup instead of manual of_node_put() calls, hence
simplifying the handling of error paths at various places.

While at it, use dev_err_probe() instead of dev_err() in all the code
paths touched.

Suggested-by: Julia Lawall <julia.lawall@inria.fr>
Signed-off-by: Kousik Sanagavarapu <five231003@gmail.com>
Link: https://lore.kernel.org/r/20240825085714.10736-3-five231003@gmail.com
Signed-off-by: Nishanth Menon <nm@ti.com>

drivers/soc/ti/pruss.c

@@ -380,50 +380,42 @@ put_clk_mux_np:
 
 static int pruss_clk_init(struct pruss *pruss, struct device_node *cfg_node)
 {
-	const struct pruss_private_data *data;
-	struct device_node *clks_np;
 	struct device *dev = pruss->dev;
-	int ret = 0;
+	struct device_node *clks_np __free(device_node) =
+			of_get_child_by_name(cfg_node, "clocks");
+	const struct pruss_private_data *data = of_device_get_match_data(dev);
+	int ret;
 
-	data = of_device_get_match_data(dev);
+	if (!clks_np)
-
+		return dev_err_probe(dev, -ENODEV,
-	clks_np = of_get_child_by_name(cfg_node, "clocks");
+				     "%pOF is missing its 'clocks' node\n",
-	if (!clks_np) {
+				     cfg_node);
-		dev_err(dev, "%pOF is missing its 'clocks' node\n", cfg_node);
-		return -ENODEV;
-	}
 
 	if (data && data->has_core_mux_clock) {
 		ret = pruss_clk_mux_setup(pruss, pruss->core_clk_mux,
 					  "coreclk-mux", clks_np);
-		if (ret) {
+		if (ret)
-			dev_err(dev, "failed to setup coreclk-mux\n");
+			return dev_err_probe(dev, ret,
-			goto put_clks_node;
+					     "failed to setup coreclk-mux\n");
-		}
 	}
 
 	ret = pruss_clk_mux_setup(pruss, pruss->iep_clk_mux, "iepclk-mux",
 				  clks_np);
-	if (ret) {
+	if (ret)
-		dev_err(dev, "failed to setup iepclk-mux\n");
+		return dev_err_probe(dev, ret, "failed to setup iepclk-mux\n");
-		goto put_clks_node;
-	}
 
-put_clks_node:
+	return 0;
-	of_node_put(clks_np);
-
-	return ret;
 }
 
 static int pruss_of_setup_memories(struct device *dev, struct pruss *pruss)
 {
 	struct device_node *np = dev_of_node(dev);
-	struct device_node *child;
+	struct device_node *child __free(device_node) =
+			of_get_child_by_name(np, "memories");
 	const struct pruss_private_data *data = of_device_get_match_data(dev);
 	const char *mem_names[PRUSS_MEM_MAX] = { "dram0", "dram1", "shrdram2" };
 	int i;
 
-	child = of_get_child_by_name(np, "memories");
 	if (!child)
 		return dev_err_probe(dev, -ENODEV,
 				     "%pOF is missing its 'memories' node\n",
@@ -442,24 +434,18 @@ static int pruss_of_setup_memories(struct device *dev, struct pruss *pruss)
 
 		index = of_property_match_string(child, "reg-names",
 						 mem_names[i]);
-		if (index < 0) {
+		if (index < 0)
-			of_node_put(child);
 			return index;
-		}
 
-		if (of_address_to_resource(child, index, &res)) {
+		if (of_address_to_resource(child, index, &res))
-			of_node_put(child);
 			return -EINVAL;
-		}
 
 		pruss->mem_regions[i].va = devm_ioremap(dev, res.start,
 							resource_size(&res));
-		if (!pruss->mem_regions[i].va) {
+		if (!pruss->mem_regions[i].va)
-			of_node_put(child);
 			return dev_err_probe(dev, -ENOMEM,
 					     "failed to parse and map memory resource %d %s\n",
 					     i, mem_names[i]);
-		}
 		pruss->mem_regions[i].pa = res.start;
 		pruss->mem_regions[i].size = resource_size(&res);
 
@@ -467,7 +453,6 @@ static int pruss_of_setup_memories(struct device *dev, struct pruss *pruss)
 			mem_names[i], &pruss->mem_regions[i].pa,
 			pruss->mem_regions[i].size, pruss->mem_regions[i].va);
 	}
-	of_node_put(child);
 
 	return 0;
 }
@@ -481,26 +466,21 @@ static struct regmap_config regmap_conf = {
 static int pruss_cfg_of_init(struct device *dev, struct pruss *pruss)
 {
 	struct device_node *np = dev_of_node(dev);
-	struct device_node *child;
+	struct device_node *child __free(device_node) =
+			of_get_child_by_name(np, "cfg");
 	struct resource res;
 	int ret;
 
-	child = of_get_child_by_name(np, "cfg");
+	if (!child)
-	if (!child) {
+		return dev_err_probe(dev, -ENODEV,
-		dev_err(dev, "%pOF is missing its 'cfg' node\n", child);
+				     "%pOF is missing its 'cfg' node\n", child);
-		return -ENODEV;
-	}
 
-	if (of_address_to_resource(child, 0, &res)) {
+	if (of_address_to_resource(child, 0, &res))
-		ret = -ENOMEM;
+		return -ENOMEM;
-		goto node_put;
-	}
 
 	pruss->cfg_base = devm_ioremap(dev, res.start, resource_size(&res));
-	if (!pruss->cfg_base) {
+	if (!pruss->cfg_base)
-		ret = -ENOMEM;
+		return -ENOMEM;
-		goto node_put;
-	}
 
 	regmap_conf.name = kasprintf(GFP_KERNEL, "%pOFn@%llx", child,
 				     (u64)res.start);
@@ -509,20 +489,15 @@ static int pruss_cfg_of_init(struct device *dev, struct pruss *pruss)
 	pruss->cfg_regmap = devm_regmap_init_mmio(dev, pruss->cfg_base,
 						  &regmap_conf);
 	kfree(regmap_conf.name);
-	if (IS_ERR(pruss->cfg_regmap)) {
+	if (IS_ERR(pruss->cfg_regmap))
-		dev_err(dev, "regmap_init_mmio failed for cfg, ret = %ld\n",
+		return dev_err_probe(dev, PTR_ERR(pruss->cfg_regmap),
-			PTR_ERR(pruss->cfg_regmap));
+				     "regmap_init_mmio failed for cfg\n");
-		ret = PTR_ERR(pruss->cfg_regmap);
-		goto node_put;
-	}
 
 	ret = pruss_clk_init(pruss, child);
 	if (ret)
-		dev_err(dev, "pruss_clk_init failed, ret = %d\n", ret);
+		return dev_err_probe(dev, ret, "pruss_clk_init failed\n");
 
-node_put:
+	return 0;
-	of_node_put(child);
-	return ret;
 }
 
 static int pruss_probe(struct platform_device *pdev)