linux-kernel - Re: [PATCH v2 4/6] gpio: cdev: wake up chardev poll() on device unbind

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Message-ID: <ZN9IYYgD6q/H3EuG@smile.fi.intel.com>
Date:   Fri, 18 Aug 2023 13:30:57 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Kent Gibson <warthog618@...il.com>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v2 4/6] gpio: cdev: wake up chardev poll() on device
 unbind

On Thu, Aug 17, 2023 at 08:49:56PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> Add a notifier block to the gpio_chardev_data structure and register it
> with the gpio_device's device notifier. Upon reception of an event, wake
> up the wait queue so that the user-space be forced out of poll() and need
> to go into a new system call which will then fail due to the chip being
> gone.

...

> +	struct gpio_chardev_data *cdev = container_of(nb,
> +						      struct gpio_chardev_data,
> +						      device_unregistered_nb);

	struct gpio_chardev_data *cdev =
		container_of(nb, struct gpio_chardev_data, device_unregistered_nb);

?

-- 
With Best Regards,
Andy Shevchenko