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

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Date:   Fri, 18 Aug 2023 09:20:16 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        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 0/6] gpio: cdev: bail out of poll() if the device goes down

On Thu, Aug 17, 2023 at 8:50 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:

> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>
> 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.
>
> v1 -> v2:
> - not much is left from v1, this time we don't repurpose the existing
>   gpio_device notifier but add a new one so that cdev structures don't
>   get unwanted events

This is nice, thanks for quick respin!
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij