Re: [PATCH v2 0/6] gpio: cdev: bail out of poll() if the device goes down

[Andy Shevchenko]

On Thu, Aug 17, 2023 at 08:49:52PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
> 
> Wake up all three wake queues (the one associated with the character
> device file, the one for V1 line events and the V2 line request one)
> when the underlying GPIO device is unregistered. This way we won't get
> stuck in poll() after the chip is gone as user-space will be forced to
> go back into a new system call and will see that gdev->chip is NULL.

Why can't you use the global device unbind notifications and filter out
what you are interested in?

-- 
With Best Regards,
Andy Shevchenko