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Tue, 15 Oct 2024 03:56:34 -0700 (PDT) From: Bartosz Golaszewski Date: Tue, 15 Oct 2024 12:56:15 +0200 Subject: [PATCH v3 3/6] gpiolib: add a per-gpio_device line state notification workqueue Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241015-gpio-notify-in-kernel-events-v3-3-9edf05802271@linaro.org> References: <20241015-gpio-notify-in-kernel-events-v3-0-9edf05802271@linaro.org> In-Reply-To: <20241015-gpio-notify-in-kernel-events-v3-0-9edf05802271@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=2506; i=bartosz.golaszewski@linaro.org; h=from:subject:message-id; bh=mlz3Sg6ePkK9/QjJgP2Wdc6zjCPXTyUO0GrqAzTAxqg=; b=owEBbQKS/ZANAwAKARGnLqAUcddyAcsmYgBnDkpewwbPIah26/a8p3MigsOLSn2/5qYPfJcSC O48WJf9JjuJAjMEAAEKAB0WIQQWnetsC8PEYBPSx58Rpy6gFHHXcgUCZw5KXgAKCRARpy6gFHHX chl4EADLDr0mXxlXm1se7tuSg+VT7O3SjgeJGyhyhdgbph+/OhURZmgbI3vrmKwIsUUITsntQSM L/lVaKN/xxPKzlx1P3JXzRFiOSlWi6RyvM3LnK62/5geCPEMPFf+54JyDdsAwTlv6r+mKmsz6Tw gilBfdwphkO07/pRwH3V8DI6oM9mWJ7j+SkBfewdA0C1yN6Kt/mcqksmGvLFEhHsizQBRNmoeus j+E302BSi6yZj7/PWYiPgszZy54p+N7N2y15+vwQTLNTR4x1RO87ydrrArgCiCg6y5Y7kdtr+rK ylVZdwFJ9ymxyiSCjpN39JUg+5JxPFjAYG1K65GmYR/Y0v9Pf5wbjb3bjPiQ0/VUoAfNV9ETdR0 XN6AosfT/pP5peI4xZUzOhlu0PARqtZmYQmvsfMDh5lG4AwFFghRiADuIACKxsUmGotiDPw5ql0 GlarAckfOBopDt6StAnMFs6/iwSzGe2hYXalb6gh9t99f6lb2C0uA3U0xGjqkNTmSQ0M0UOk5Rm ovhe0ELKjpj7zLCmPb3T3tHijKm1vO9QVLyknUYBkYWeoP5ji+3FGq8tiMm9WCjHy7f0TThmjpP n1zpMzriuSkxcONSiMCQzW1BJZu1rKbJqRya8b1LCg/FPq1o2tk/nKfCA6ItZhl7VyMfB70PTti pw9YAF/YGMn/HrA== X-Developer-Key: i=bartosz.golaszewski@linaro.org; a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski In order to prepare the line state notification mechanism for working in atomic context as well, add a dedicated, high-priority, ordered workqueue to GPIO device which will be used to queue the events fron any context for them to be emitted always in process context. Signed-off-by: Bartosz Golaszewski --- drivers/gpio/gpiolib-cdev.c | 6 ++++++ drivers/gpio/gpiolib.h | 4 ++++ 2 files changed, 10 insertions(+) diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c index b28751242835..5b28a558c9d0 100644 --- a/drivers/gpio/gpiolib-cdev.c +++ b/drivers/gpio/gpiolib-cdev.c @@ -2868,6 +2868,11 @@ int gpiolib_cdev_register(struct gpio_device *gdev, dev_t devt) gdev->chrdev.owner = THIS_MODULE; gdev->dev.devt = MKDEV(MAJOR(devt), gdev->id); + gdev->line_state_wq = alloc_ordered_workqueue(dev_name(&gdev->dev), + WQ_HIGHPRI); + if (!gdev->line_state_wq) + return -ENOMEM; + ret = cdev_device_add(&gdev->chrdev, &gdev->dev); if (ret) return ret; @@ -2884,6 +2889,7 @@ int gpiolib_cdev_register(struct gpio_device *gdev, dev_t devt) void gpiolib_cdev_unregister(struct gpio_device *gdev) { + destroy_workqueue(gdev->line_state_wq); cdev_device_del(&gdev->chrdev, &gdev->dev); blocking_notifier_call_chain(&gdev->device_notifier, 0, NULL); } diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h index 067197d61d57..d24cd9e8b17c 100644 --- a/drivers/gpio/gpiolib.h +++ b/drivers/gpio/gpiolib.h @@ -17,6 +17,7 @@ #include #include #include +#include #define GPIOCHIP_NAME "gpiochip" @@ -44,6 +45,8 @@ * @list: links gpio_device:s together for traversal * @line_state_notifier: used to notify subscribers about lines being * requested, released or reconfigured + * @line_state_wq: used to emit line state events from a separate thread in + * process context * @device_notifier: used to notify character device wait queues about the GPIO * device being unregistered * @srcu: protects the pointer to the underlying GPIO chip @@ -70,6 +73,7 @@ struct gpio_device { void *data; struct list_head list; struct blocking_notifier_head line_state_notifier; + struct workqueue_struct *line_state_wq; struct blocking_notifier_head device_notifier; struct srcu_struct srcu;