linux-kernel - [PATCH 3/3] soc: qcom: smem_state: simplify locking with guard()

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Message-ID: <20240822164853.231087-4-krzysztof.kozlowski@linaro.org>
Date: Thu, 22 Aug 2024 18:48:53 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Andy Gross <agross@...eaurora.org>,
	linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 3/3] soc: qcom: smem_state: simplify locking with guard()

Simplify error handling (less gotos) over locks with guard().

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/soc/qcom/smem_state.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/soc/qcom/smem_state.c b/drivers/soc/qcom/smem_state.c
index a8be3a2f3382..cc5be8019b6a 100644
--- a/drivers/soc/qcom/smem_state.c
+++ b/drivers/soc/qcom/smem_state.c
@@ -3,6 +3,7 @@
  * Copyright (c) 2015, Sony Mobile Communications Inc.
  * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
  */
+#include <linux/cleanup.h>
 #include <linux/device.h>
 #include <linux/list.h>
 #include <linux/module.h>
@@ -60,20 +61,15 @@ static struct qcom_smem_state *of_node_to_state(struct device_node *np)
 {
 	struct qcom_smem_state *state;
 
-	mutex_lock(&list_lock);
+	guard(mutex)(&list_lock);
 
 	list_for_each_entry(state, &smem_states, list) {
 		if (state->of_node == np) {
 			kref_get(&state->refcount);
-			goto unlock;
+			return state;
 		}
 	}
-	state = ERR_PTR(-EPROBE_DEFER);
-
-unlock:
-	mutex_unlock(&list_lock);
-
-	return state;
+	return ERR_PTR(-EPROBE_DEFER);
 }
 
 /**
-- 
2.43.0