linux-kernel - [PATCH 07/11] pinctrl: tb10x: Simplify locking with guard()

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Message-Id: <20260114-pinctrl-cleanup-guard-v1-7-a14572685cd3@oss.qualcomm.com>
Date: Wed, 14 Jan 2026 16:30:08 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
To: Andrew Jeffery <andrew@...econstruct.com.au>,
        Linus Walleij <linusw@...nel.org>, Joel Stanley <joel@....id.au>,
        Emil Renner Berthing <kernel@...il.dk>,
        Hal Feng <hal.feng@...rfivetech.com>,
        Chen Wang <unicorn_wang@...look.com>,
        Inochi Amaoto <inochiama@...il.com>,
        Basavaraj Natikar <Basavaraj.Natikar@....com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        Bartosz Golaszewski <brgl@...nel.org>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        Daniel Machon <daniel.machon@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Patrice Chotard <patrice.chotard@...s.st.com>
Cc: linux-aspeed@...ts.ozlabs.org, openbmc@...ts.ozlabs.org,
        linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, sophgo@...ts.linux.dev,
        linux-tegra@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
Subject: [PATCH 07/11] pinctrl: tb10x: Simplify locking with guard()

Simplify error handling (less code in error case) over locks with
guard().

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
---
 drivers/pinctrl/pinctrl-tb10x.c | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-tb10x.c b/drivers/pinctrl/pinctrl-tb10x.c
index 129fa51d13b1..3f581404a9b9 100644
--- a/drivers/pinctrl/pinctrl-tb10x.c
+++ b/drivers/pinctrl/pinctrl-tb10x.c
@@ -607,7 +607,7 @@ static int tb10x_gpio_request_enable(struct pinctrl_dev *pctl,
 	int muxmode = -1;
 	int i;
 
-	mutex_lock(&state->mutex);
+	guard(mutex)(&state->mutex);
 
 	/*
 	 * Figure out to which port the requested GPIO belongs and how to
@@ -642,7 +642,6 @@ static int tb10x_gpio_request_enable(struct pinctrl_dev *pctl,
 					 * Error: The requested pin is already
 					 * used for something else.
 					 */
-					mutex_unlock(&state->mutex);
 					return -EBUSY;
 				}
 				break;
@@ -667,8 +666,6 @@ static int tb10x_gpio_request_enable(struct pinctrl_dev *pctl,
 	if (muxport >= 0)
 		tb10x_pinctrl_set_config(state, muxport, muxmode);
 
-	mutex_unlock(&state->mutex);
-
 	return 0;
 }
 
@@ -695,34 +692,28 @@ static int tb10x_pctl_set_mux(struct pinctrl_dev *pctl,
 	if (grp->port < 0)
 		return 0;
 
-	mutex_lock(&state->mutex);
+	guard(mutex)(&state->mutex);
 
 	/*
 	 * Check if the requested function is compatible with previously
 	 * requested functions.
 	 */
 	if (state->ports[grp->port].count
-			&& (state->ports[grp->port].mode != grp->mode)) {
-		mutex_unlock(&state->mutex);
+			&& (state->ports[grp->port].mode != grp->mode))
 		return -EBUSY;
-	}
 
 	/*
 	 * Check if the requested function is compatible with previously
 	 * requested GPIOs.
 	 */
 	for (i = 0; i < grp->pincnt; i++)
-		if (test_bit(grp->pins[i], state->gpios)) {
-			mutex_unlock(&state->mutex);
+		if (test_bit(grp->pins[i], state->gpios))
 			return -EBUSY;
-		}
 
 	tb10x_pinctrl_set_config(state, grp->port, grp->mode);
 
 	state->ports[grp->port].count++;
 
-	mutex_unlock(&state->mutex);
-
 	return 0;
 }
 

-- 
2.51.0