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Tue, 08 Apr 2025 00:36:34 -0700 (PDT) Received: from [127.0.1.1] ([2a01:cb1d:dc:7e00:2adf:eaae:f6ea:1a73]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-39c3020d980sm14287627f8f.61.2025.04.08.00.36.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Apr 2025 00:36:33 -0700 (PDT) From: Bartosz Golaszewski Date: Tue, 08 Apr 2025 09:36:30 +0200 Subject: [PATCH 3/4] regulator: rpi-panel-attiny: use lock guards for the state mutex Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250408-gpiochip-set-rv-regulator-v1-3-a18b6154b31a@linaro.org> References: <20250408-gpiochip-set-rv-regulator-v1-0-a18b6154b31a@linaro.org> In-Reply-To: <20250408-gpiochip-set-rv-regulator-v1-0-a18b6154b31a@linaro.org> To: Liam Girdwood , Mark Brown , Linus Walleij , Bartosz Golaszewski Cc: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, Bartosz Golaszewski X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; 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a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski Use mutex lock guards from linux/cleanup.h to simplify the driver code. Note that ret must be initialized in order to avoid a build warning as scoped_guard() is implemented as a for loop. Signed-off-by: Bartosz Golaszewski --- drivers/regulator/rpi-panel-attiny-regulator.c | 35 ++++++++++------------= ---- 1 file changed, 13 insertions(+), 22 deletions(-) diff --git a/drivers/regulator/rpi-panel-attiny-regulator.c b/drivers/regul= ator/rpi-panel-attiny-regulator.c index 5ff348939560..43a7c4737cb4 100644 --- a/drivers/regulator/rpi-panel-attiny-regulator.c +++ b/drivers/regulator/rpi-panel-attiny-regulator.c @@ -6,6 +6,7 @@ */ =20 #include +#include #include #include #include @@ -94,7 +95,7 @@ static int attiny_lcd_power_enable(struct regulator_dev *= rdev) { struct attiny_lcd *state =3D rdev_get_drvdata(rdev); =20 - mutex_lock(&state->lock); + guard(mutex)(&state->lock); =20 /* Ensure bridge, and tp stay in reset */ attiny_set_port_state(state, REG_PORTC, 0); @@ -115,8 +116,6 @@ static int attiny_lcd_power_enable(struct regulator_dev= *rdev) =20 msleep(80); =20 - mutex_unlock(&state->lock); - return 0; } =20 @@ -124,7 +123,7 @@ static int attiny_lcd_power_disable(struct regulator_de= v *rdev) { struct attiny_lcd *state =3D rdev_get_drvdata(rdev); =20 - mutex_lock(&state->lock); + guard(mutex)(&state->lock); =20 regmap_write(rdev->regmap, REG_PWM, 0); usleep_range(5000, 10000); @@ -136,8 +135,6 @@ static int attiny_lcd_power_disable(struct regulator_de= v *rdev) attiny_set_port_state(state, REG_PORTC, 0); msleep(30); =20 - mutex_unlock(&state->lock); - return 0; } =20 @@ -145,19 +142,17 @@ static int attiny_lcd_power_is_enabled(struct regulat= or_dev *rdev) { struct attiny_lcd *state =3D rdev_get_drvdata(rdev); unsigned int data; - int ret, i; + int ret =3D 0, i; =20 - mutex_lock(&state->lock); - - for (i =3D 0; i < 10; i++) { - ret =3D regmap_read(rdev->regmap, REG_PORTC, &data); - if (!ret) - break; - usleep_range(10000, 12000); + scoped_guard(mutex, &state->lock) { + for (i =3D 0; i < 10; i++) { + ret =3D regmap_read(rdev->regmap, REG_PORTC, &data); + if (!ret) + break; + usleep_range(10000, 12000); + } } =20 - mutex_unlock(&state->lock); - if (ret < 0) return ret; =20 @@ -190,7 +185,7 @@ static int attiny_update_status(struct backlight_device= *bl) int brightness =3D backlight_get_brightness(bl); int ret, i; =20 - mutex_lock(&state->lock); + guard(mutex)(&state->lock); =20 for (i =3D 0; i < 10; i++) { ret =3D regmap_write(regmap, REG_PWM, brightness); @@ -198,8 +193,6 @@ static int attiny_update_status(struct backlight_device= *bl) break; } =20 - mutex_unlock(&state->lock); - return ret; } =20 @@ -217,7 +210,7 @@ static void attiny_gpio_set(struct gpio_chip *gc, unsig= ned int off, int val) struct attiny_lcd *state =3D gpiochip_get_data(gc); u8 last_val; =20 - mutex_lock(&state->lock); + guard(mutex)(&state->lock); =20 last_val =3D attiny_get_port_state(state, mappings[off].reg); if (val) @@ -239,8 +232,6 @@ static void attiny_gpio_set(struct gpio_chip *gc, unsig= ned int off, int val) =20 msleep(100); } - - mutex_unlock(&state->lock); } =20 static int attiny_i2c_read(struct i2c_client *client, u8 reg, unsigned int= *buf) --=20 2.45.2