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Thu, 17 Oct 2024 01:14:24 -0700 (PDT) From: Bartosz Golaszewski Date: Thu, 17 Oct 2024 10:14:10 +0200 Subject: [PATCH v4 2/8] gpiolib: unduplicate chip guard in set_config path Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241017-gpio-notify-in-kernel-events-v4-2-64bc05f3be0c@linaro.org> References: <20241017-gpio-notify-in-kernel-events-v4-0-64bc05f3be0c@linaro.org> In-Reply-To: <20241017-gpio-notify-in-kernel-events-v4-0-64bc05f3be0c@linaro.org> To: Linus Walleij , Bartosz Golaszewski , Kent Gibson Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Bartosz Golaszewski X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2395; i=bartosz.golaszewski@linaro.org; h=from:subject:message-id; bh=5bkoQOmE+e79NCUZkE2hkqB3kJJTpG+Rd7AZwxRE2E4=; b=owEBbQKS/ZANAwAKARGnLqAUcddyAcsmYgBnEMdcC3OI1Ir1Rau9V0RSZUWiGg3TGO6oiTtTw F6cv6JTpD+JAjMEAAEKAB0WIQQWnetsC8PEYBPSx58Rpy6gFHHXcgUCZxDHXAAKCRARpy6gFHHX cjU+EACP3LgjIItD0S2u03ccGO+2y1ZSqg0lUrZM8TUzO903niSMQUprfHC6Jx8nrNXMnLPSA4J JwJIrEBTfgzgohscQGfcDX3N6PBccujjHsScvu1L8oA1SNDzXj5vomZ1PKiQU+mm86h0k36EfRQ eQjQBSVxoCKQAVuOYnaiaugxv6dIA3DaHZYnO+1XgTH0Hlyn8GcWhh6t4SZ3k3EbUyhNnpNNiBj zJuAm7eyRm1/hSDrXoEF+jhJK5tgEb54n2Ev/eDolo6xClytxATDy/d9HiBt/cA+fa3Ih7/vq8+ UKaJSEhqrkEckWS16uzwPDWx9b/y786y2a0lvGwMcSxXxWzdS1eU+2LBPQmhDAW7FqW0+6AzfKU h2mlFiOlAzYEkyFNe/hdJR5cFOfzV435FDH0q3jZxQ6fMyL5/cuDh8Q73Xw/toVvVnt0pUGRVaL QZx65x/kJgje9LKVa9YTn5iMWB6tKYKT2SOGdaAgu6g4UUNbGLqxvxR2N473U/ieg74CYCzNs1b fieV78I4ek9ic4e6Qi+gC07CZGd12EfaQUFloxbphdmN9+MoiTfoZCDmijZhTkYzTMYJx4jHcuy UZaI5nAhcuEB2PY4MGbK4p0sqfSXKYmR0MxF2ZgWSnejtiEaVQhpPnyGpSIpOADGW+UwH0eAwV6 b/iqhtolvtslxQw== X-Developer-Key: i=bartosz.golaszewski@linaro.org; a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski We don't need to guard the GPIO chip until its first dereference in gpio_do_set_config(). First: change the prototype of gpio_do_set_config() to take the GPIO line descriptor as argument, then move the gpio_chip protection into it and drop it in two places where it's done too early. This has the added benefit of making gpio_go_set_config() safe to use from outside of this compilation unit without taking the gdev SRCU read lock and will come in handy when we'll want to make it available to the character device code. Signed-off-by: Bartosz Golaszewski --- drivers/gpio/gpiolib.c | 23 +++++++++-------------- 1 file changed, 9 insertions(+), 14 deletions(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index c09464f70f73..b1ce213d3a23 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -2562,13 +2562,16 @@ EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); * rely on gpio_request() having been called beforehand. */ -static int gpio_do_set_config(struct gpio_chip *gc, unsigned int offset, - unsigned long config) +static int gpio_do_set_config(struct gpio_desc *desc, unsigned long config) { - if (!gc->set_config) + CLASS(gpio_chip_guard, guard)(desc); + if (!guard.gc) + return -ENODEV; + + if (!guard.gc->set_config) return -ENOTSUPP; - return gc->set_config(gc, offset, config); + return guard.gc->set_config(guard.gc, gpio_chip_hwgpio(desc), config); } static int gpio_set_config_with_argument(struct gpio_desc *desc, @@ -2577,12 +2580,8 @@ static int gpio_set_config_with_argument(struct gpio_desc *desc, { unsigned long config; - CLASS(gpio_chip_guard, guard)(desc); - if (!guard.gc) - return -ENODEV; - config = pinconf_to_config_packed(mode, argument); - return gpio_do_set_config(guard.gc, gpio_chip_hwgpio(desc), config); + return gpio_do_set_config(desc, config); } static int gpio_set_config_with_argument_optional(struct gpio_desc *desc, @@ -2944,11 +2943,7 @@ int gpiod_set_config(struct gpio_desc *desc, unsigned long config) { VALIDATE_DESC(desc); - CLASS(gpio_chip_guard, guard)(desc); - if (!guard.gc) - return -ENODEV; - - return gpio_do_set_config(guard.gc, gpio_chip_hwgpio(desc), config); + return gpio_do_set_config(desc, config); } EXPORT_SYMBOL_GPL(gpiod_set_config);