linux-kernel - Re: [PATCH] gpio: cdev: make sure the cdev fd is still active before emitting events

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Message-ID: <176355022869.63990.7203538137756215633.b4-ty@linaro.org>
Date: Wed, 19 Nov 2025 12:03:50 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Kent Gibson <warthog618@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>
Cc: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Alexander Sverdlin <alexander.sverdlin@...il.com>
Subject: Re: [PATCH] gpio: cdev: make sure the cdev fd is still active before emitting events

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>


On Mon, 17 Nov 2025 16:08:42 +0100, Bartosz Golaszewski wrote:
> With the final call to fput() on a file descriptor, the release action
> may be deferred and scheduled on a work queue. The reference count of
> that descriptor is still zero and it must not be used. It's possible
> that a GPIO change, we want to notify the user-space about, happens
> AFTER the reference count on the file descriptor associated with the
> character device went down to zero but BEFORE the .release() callback
> was called from the workqueue and so BEFORE we unregistered from the
> notifier.
> 
> [...]

Applied, thanks!

[1/1] gpio: cdev: make sure the cdev fd is still active before emitting events
      https://git.kernel.org/brgl/linux/c/d4cd0902c156b2ca60fdda8cd8b5bcb4b0e9ed64

Best regards,
-- 
Bartosz Golaszewski <bartosz.golaszewski@...aro.org>