linux-kernel - [PATCH v2 01/13] memory: atmel-ebi: use scoped device node handling to simplify error paths

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Message-Id: <20240816-cleanup-h-of-node-put-memory-v2-1-9eed0ee16b78@linaro.org>
Date: Fri, 16 Aug 2024 12:54:25 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Krzysztof Kozlowski <krzk@...nel.org>, 
 Nicolas Ferre <nicolas.ferre@...rochip.com>, 
 Alexandre Belloni <alexandre.belloni@...tlin.com>, 
 Claudiu Beznea <claudiu.beznea@...on.dev>, 
 Lukasz Luba <lukasz.luba@....com>, Alim Akhtar <alim.akhtar@...sung.com>, 
 Maxime Coquelin <mcoquelin.stm32@...il.com>, 
 Alexandre Torgue <alexandre.torgue@...s.st.com>, 
 Thierry Reding <thierry.reding@...il.com>, 
 Jonathan Hunter <jonathanh@...dia.com>, 
 Santosh Shilimkar <ssantosh@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org, 
 linux-stm32@...md-mailman.stormreply.com, linux-tegra@...r.kernel.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v2 01/13] memory: atmel-ebi: 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>

---

Changes in v2:
1. Wrap line before of_parse_phandle()
---
 drivers/memory/atmel-ebi.c | 29 ++++++++++-------------------
 1 file changed, 10 insertions(+), 19 deletions(-)

diff --git a/drivers/memory/atmel-ebi.c b/drivers/memory/atmel-ebi.c
index e8bb5f37f5cb..8f5b3302ee30 100644
--- a/drivers/memory/atmel-ebi.c
+++ b/drivers/memory/atmel-ebi.c
@@ -6,6 +6,7 @@
  * Copyright (C) 2013 Jean-Jacques Hiblot <jjhiblot@...phandler.com>
  */
 
+#include <linux/cleanup.h>
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/mfd/syscon.h>
@@ -517,7 +518,7 @@ static int atmel_ebi_dev_disable(struct atmel_ebi *ebi, struct device_node *np)
 static int atmel_ebi_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct device_node *child, *np = dev->of_node, *smc_np;
+	struct device_node *child, *np = dev->of_node;
 	struct atmel_ebi *ebi;
 	int ret, reg_cells;
 	struct clk *clk;
@@ -541,30 +542,24 @@ static int atmel_ebi_probe(struct platform_device *pdev)
 
 	ebi->clk = clk;
 
-	smc_np = of_parse_phandle(dev->of_node, "atmel,smc", 0);
+	struct device_node *smc_np __free(device_node) =
+		of_parse_phandle(dev->of_node, "atmel,smc", 0);
 
 	ebi->smc.regmap = syscon_node_to_regmap(smc_np);
-	if (IS_ERR(ebi->smc.regmap)) {
-		ret = PTR_ERR(ebi->smc.regmap);
-		goto put_node;
-	}
+	if (IS_ERR(ebi->smc.regmap))
+		return PTR_ERR(ebi->smc.regmap);
 
 	ebi->smc.layout = atmel_hsmc_get_reg_layout(smc_np);
-	if (IS_ERR(ebi->smc.layout)) {
-		ret = PTR_ERR(ebi->smc.layout);
-		goto put_node;
-	}
+	if (IS_ERR(ebi->smc.layout))
+		return PTR_ERR(ebi->smc.layout);
 
 	ebi->smc.clk = of_clk_get(smc_np, 0);
 	if (IS_ERR(ebi->smc.clk)) {
-		if (PTR_ERR(ebi->smc.clk) != -ENOENT) {
-			ret = PTR_ERR(ebi->smc.clk);
-			goto put_node;
-		}
+		if (PTR_ERR(ebi->smc.clk) != -ENOENT)
+			return PTR_ERR(ebi->smc.clk);
 
 		ebi->smc.clk = NULL;
 	}
-	of_node_put(smc_np);
 	ret = clk_prepare_enable(ebi->smc.clk);
 	if (ret)
 		return ret;
@@ -615,10 +610,6 @@ static int atmel_ebi_probe(struct platform_device *pdev)
 	}
 
 	return of_platform_populate(np, NULL, NULL, dev);
-
-put_node:
-	of_node_put(smc_np);
-	return ret;
 }
 
 static __maybe_unused int atmel_ebi_resume(struct device *dev)

-- 
2.43.0