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Wed, 23 Apr 2025 01:55:50 -0700 (PDT) Received: from [127.0.1.1] ([2a01:cb1d:dc:7e00:74b0:71bd:6dda:dcc1]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-44092d3654dsm17731685e9.28.2025.04.23.01.55.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Apr 2025 01:55:49 -0700 (PDT) From: Bartosz Golaszewski Date: Wed, 23 Apr 2025 10:55:40 +0200 Subject: [PATCH 2/6] hid: cp2112: hold the lock for the entire direction_output() call Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250423-gpiochip-set-rv-hid-v1-2-2e6762b582f6@linaro.org> References: <20250423-gpiochip-set-rv-hid-v1-0-2e6762b582f6@linaro.org> In-Reply-To: <20250423-gpiochip-set-rv-hid-v1-0-2e6762b582f6@linaro.org> To: Jiri Kosina , Benjamin Tissoires , Linus Walleij , Bartosz Golaszewski , Rishi Gupta Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-i2c@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 We currently take the lock, set direction to output, release it, reacquire it and set the desired value. That doesn't look correct. Introduce a helper function that sets the value without taking the lock and use it where applicable in order to combine the critical sections. Signed-off-by: Bartosz Golaszewski --- drivers/hid/hid-cp2112.c | 23 +++++++++++++++-------- 1 file changed, 15 insertions(+), 8 deletions(-) diff --git a/drivers/hid/hid-cp2112.c b/drivers/hid/hid-cp2112.c index a001b9acd2d4..408c865efdd4 100644 --- a/drivers/hid/hid-cp2112.c +++ b/drivers/hid/hid-cp2112.c @@ -17,6 +17,7 @@ */ #include +#include #include #include #include @@ -218,15 +219,13 @@ static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset) return ret; } -static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value) +static void cp2112_gpio_set_unlocked(struct cp2112_device *dev, + unsigned int offset, int value) { - struct cp2112_device *dev = gpiochip_get_data(chip); struct hid_device *hdev = dev->hdev; u8 *buf = dev->in_out_buffer; int ret; - mutex_lock(&dev->lock); - buf[0] = CP2112_GPIO_SET; buf[1] = value ? CP2112_GPIO_ALL_GPIO_MASK : 0; buf[2] = BIT(offset); @@ -236,8 +235,16 @@ static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value) HID_REQ_SET_REPORT); if (ret < 0) hid_err(hdev, "error setting GPIO values: %d\n", ret); +} - mutex_unlock(&dev->lock); +static void cp2112_gpio_set(struct gpio_chip *chip, unsigned int offset, + int value) +{ + struct cp2112_device *dev = gpiochip_get_data(chip); + + guard(mutex)(&dev->lock); + + return cp2112_gpio_set_unlocked(dev, offset, value); } static int cp2112_gpio_get_all(struct gpio_chip *chip) @@ -306,13 +313,13 @@ static int cp2112_gpio_direction_output(struct gpio_chip *chip, goto fail; } - mutex_unlock(&dev->lock); - /* * Set gpio value when output direction is already set, * as specified in AN495, Rev. 0.2, cpt. 4.4 */ - cp2112_gpio_set(chip, offset, value); + cp2112_gpio_set_unlocked(dev, offset, value); + + mutex_unlock(&dev->lock); return 0;