linux-kernel - [PATCH 09/10] pmdomain: renesas: rcar-gen4-sysc: Use scoped device node handling to simplify error paths

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Message-Id: <20240823-cleanup-h-guard-pm-domain-v1-9-8320722eaf39@linaro.org>
Date: Fri, 23 Aug 2024 14:51:13 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Ulf Hansson <ulf.hansson@...aro.org>, Heiko Stuebner <heiko@...ech.de>, 
 Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Geert Uytterhoeven <geert+renesas@...der.be>, 
 Magnus Damm <magnus.damm@...il.com>
Cc: linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 imx@...ts.linux.dev, linux-arm-msm@...r.kernel.org, 
 linux-renesas-soc@...r.kernel.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 09/10] pmdomain: renesas: rcar-gen4-sysc: Use scoped device
 node handling to simplify error paths

Obtain the device node reference with scoped/cleanup.h to reduce error
handling and make the code a bit simpler.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/pmdomain/renesas/rcar-gen4-sysc.c | 26 ++++++++++----------------
 1 file changed, 10 insertions(+), 16 deletions(-)

diff --git a/drivers/pmdomain/renesas/rcar-gen4-sysc.c b/drivers/pmdomain/renesas/rcar-gen4-sysc.c
index 66409cff2083..4ca85dbdedc2 100644
--- a/drivers/pmdomain/renesas/rcar-gen4-sysc.c
+++ b/drivers/pmdomain/renesas/rcar-gen4-sysc.c
@@ -6,6 +6,7 @@
  */
 
 #include <linux/bits.h>
+#include <linux/cleanup.h>
 #include <linux/clk/renesas.h>
 #include <linux/delay.h>
 #include <linux/err.h>
@@ -303,12 +304,12 @@ static int __init rcar_gen4_sysc_pd_init(void)
 	const struct rcar_gen4_sysc_info *info;
 	const struct of_device_id *match;
 	struct rcar_gen4_pm_domains *domains;
-	struct device_node *np;
 	void __iomem *base;
 	unsigned int i;
 	int error;
 
-	np = of_find_matching_node_and_match(NULL, rcar_gen4_sysc_matches, &match);
+	struct device_node *np __free(device_node) =
+		of_find_matching_node_and_match(NULL, rcar_gen4_sysc_matches, &match);
 	if (!np)
 		return -ENODEV;
 
@@ -317,17 +318,14 @@ static int __init rcar_gen4_sysc_pd_init(void)
 	base = of_iomap(np, 0);
 	if (!base) {
 		pr_warn("%pOF: Cannot map regs\n", np);
-		error = -ENOMEM;
-		goto out_put;
+		return -ENOMEM;
 	}
 
 	rcar_gen4_sysc_base = base;
 
 	domains = kzalloc(sizeof(*domains), GFP_KERNEL);
-	if (!domains) {
-		error = -ENOMEM;
-		goto out_put;
-	}
+	if (!domains)
+		return -ENOMEM;
 
 	domains->onecell_data.domains = domains->domains;
 	domains->onecell_data.num_domains = ARRAY_SIZE(domains->domains);
@@ -345,10 +343,8 @@ static int __init rcar_gen4_sysc_pd_init(void)
 
 		n = strlen(area->name) + 1;
 		pd = kzalloc(sizeof(*pd) + n, GFP_KERNEL);
-		if (!pd) {
-			error = -ENOMEM;
-			goto out_put;
-		}
+		if (!pd)
+			return -ENOMEM;
 
 		memcpy(pd->name, area->name, n);
 		pd->genpd.name = pd->name;
@@ -357,7 +353,7 @@ static int __init rcar_gen4_sysc_pd_init(void)
 
 		error = rcar_gen4_sysc_pd_setup(pd);
 		if (error)
-			goto out_put;
+			return error;
 
 		domains->domains[area->pdr] = &pd->genpd;
 
@@ -369,14 +365,12 @@ static int __init rcar_gen4_sysc_pd_init(void)
 		if (error) {
 			pr_warn("Failed to add PM subdomain %s to parent %u\n",
 				area->name, area->parent);
-			goto out_put;
+			return error;
 		}
 	}
 
 	error = of_genpd_add_provider_onecell(np, &domains->onecell_data);
 
-out_put:
-	of_node_put(np);
 	return error;
 }
 early_initcall(rcar_gen4_sysc_pd_init);

-- 
2.43.0