linux-kernel - [PATCH 1/3] clk: qcom: rpm: simplify locking with guard()

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Message-Id: <20240823-cleanup-h-guard-clk-qcom-v1-1-68bb9601c9dd@linaro.org>
Date: Fri, 23 Aug 2024 17:38:43 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 1/3] clk: qcom: rpm: simplify locking with guard()

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

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/clk/qcom/clk-rpm.c | 27 +++++++++++----------------
 1 file changed, 11 insertions(+), 16 deletions(-)

diff --git a/drivers/clk/qcom/clk-rpm.c b/drivers/clk/qcom/clk-rpm.c
index 9da034f8f2ff..ccc112c21667 100644
--- a/drivers/clk/qcom/clk-rpm.c
+++ b/drivers/clk/qcom/clk-rpm.c
@@ -4,6 +4,7 @@
  * Copyright (c) 2014, The Linux Foundation. All rights reserved.
  */
 
+#include <linux/cleanup.h>
 #include <linux/clk-provider.h>
 #include <linux/err.h>
 #include <linux/export.h>
@@ -224,10 +225,10 @@ static void clk_rpm_unprepare(struct clk_hw *hw)
 	unsigned long active_rate, sleep_rate;
 	int ret;
 
-	mutex_lock(&rpm_clk_lock);
+	guard(mutex)(&rpm_clk_lock);
 
 	if (!r->rate)
-		goto out;
+		return;
 
 	/* Take peer clock's rate into account only if it's enabled. */
 	if (peer->enabled)
@@ -237,17 +238,14 @@ static void clk_rpm_unprepare(struct clk_hw *hw)
 	active_rate = r->branch ? !!peer_rate : peer_rate;
 	ret = clk_rpm_set_rate_active(r, active_rate);
 	if (ret)
-		goto out;
+		return;
 
 	sleep_rate = r->branch ? !!peer_sleep_rate : peer_sleep_rate;
 	ret = clk_rpm_set_rate_sleep(r, sleep_rate);
 	if (ret)
-		goto out;
+		return;
 
 	r->enabled = false;
-
-out:
-	mutex_unlock(&rpm_clk_lock);
 }
 
 static int clk_rpm_xo_prepare(struct clk_hw *hw)
@@ -324,12 +322,12 @@ static int clk_rpm_set_rate(struct clk_hw *hw,
 	unsigned long active_rate, sleep_rate;
 	unsigned long this_rate = 0, this_sleep_rate = 0;
 	unsigned long peer_rate = 0, peer_sleep_rate = 0;
-	int ret = 0;
+	int ret;
 
-	mutex_lock(&rpm_clk_lock);
+	guard(mutex)(&rpm_clk_lock);
 
 	if (!r->enabled)
-		goto out;
+		return 0;
 
 	to_active_sleep(r, rate, &this_rate, &this_sleep_rate);
 
@@ -341,19 +339,16 @@ static int clk_rpm_set_rate(struct clk_hw *hw,
 	active_rate = max(this_rate, peer_rate);
 	ret = clk_rpm_set_rate_active(r, active_rate);
 	if (ret)
-		goto out;
+		return ret;
 
 	sleep_rate = max(this_sleep_rate, peer_sleep_rate);
 	ret = clk_rpm_set_rate_sleep(r, sleep_rate);
 	if (ret)
-		goto out;
+		return ret;
 
 	r->rate = rate;
 
-out:
-	mutex_unlock(&rpm_clk_lock);
-
-	return ret;
+	return 0;
 }
 
 static long clk_rpm_round_rate(struct clk_hw *hw, unsigned long rate,

-- 
2.43.0