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Message-ID: <CACRpkdYVhr71pEB9wZWUTMh4MSVo9OziYsNz-9qcZGiFsr+Geg@mail.gmail.com>
Date: Thu, 10 Aug 2023 13:46:47 +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] gpiolib: fix reference leaks when removing GPIO chips
still in use
On Thu, Aug 10, 2023 at 12:03 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>
> After we remove a GPIO chip that still has some requested descriptors,
> gpiod_free_commit() will fail and we will never put the references to the
> GPIO device and the owning module in gpiod_free().
>
> Rework this function to:
> - not warn on desc == NULL as this is a use-case on which most free
> functions silently return
> - put the references to desc->gdev and desc->gdev->owner unconditionally
> so that the release callback actually gets called when the remaining
> references are dropped by external GPIO users
>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Looks good to me!
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Yours,
Linus Walleij
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