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

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Message-ID: <ZN9JID53QpSz4epI@smile.fi.intel.com>
Date:   Fri, 18 Aug 2023 13:34:08 +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 0/6] gpio: cdev: bail out of poll() if the device goes
 down

On Thu, Aug 17, 2023 at 08:49:52PM +0200, Bartosz Golaszewski 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.

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

-- 
With Best Regards,
Andy Shevchenko