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McKenney" , Andy Shevchenko , Wolfram Sang Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v2 12/23] gpio: sysfs: extend the critical section for unregistering sysfs devices Date: Mon, 5 Feb 2024 10:34:07 +0100 Message-Id: <20240205093418.39755-13-brgl@bgdev.pl> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240205093418.39755-1-brgl@bgdev.pl> References: <20240205093418.39755-1-brgl@bgdev.pl> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Bartosz Golaszewski Checking the gdev->mockdev pointer for NULL must be part of the critical section. Signed-off-by: Bartosz Golaszewski Reviewed-by: Linus Walleij --- drivers/gpio/gpiolib-sysfs.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c index 1cc707685f87..5da316ea9cc7 100644 --- a/drivers/gpio/gpiolib-sysfs.c +++ b/drivers/gpio/gpiolib-sysfs.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 =20 #include +#include #include #include #include @@ -768,15 +769,15 @@ void gpiochip_sysfs_unregister(struct gpio_device *gd= ev) struct gpio_desc *desc; struct gpio_chip *chip =3D gdev->chip; =20 - if (!gdev->mockdev) - return; + scoped_guard(mutex, &sysfs_lock) { + if (!gdev->mockdev) + return; =20 - device_unregister(gdev->mockdev); + device_unregister(gdev->mockdev); =20 - /* prevent further gpiod exports */ - mutex_lock(&sysfs_lock); - gdev->mockdev =3D NULL; - mutex_unlock(&sysfs_lock); + /* prevent further gpiod exports */ + gdev->mockdev =3D NULL; + } =20 /* unregister gpiod class devices owned by sysfs */ for_each_gpio_desc_with_flag(chip, desc, FLAG_SYSFS) { --=20 2.40.1