Re: [PATCH v2] gpio: free irqs that are still requested when the chip is being removed
From: Herve Codina
Date: Mon Sep 23 2024 - 09:00:57 EST
Hi Bartosz,
On Thu, 19 Sep 2024 15:51:04 +0200
Bartosz Golaszewski <brgl@xxxxxxxx> wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
>
> If we remove a GPIO chip that is also an interrupt controller with users
> not having freed some interrupts, we'll end up leaking resources as
> indicated by the following warning:
>
> remove_proc_entry: removing non-empty directory 'irq/30', leaking at least 'gpio'
>
> As there's no way of notifying interrupt users about the irqchip going
> away and the interrupt subsystem is not plugged into the driver model and
> so not all cases can be handled by devlinks, we need to make sure to free
> all interrupts before the complete the removal of the provider.
>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
> ---
> v1 -> v2:
> - we should actually take the request_mutex to protect the irqaction from being
> freed while we dereference it and keep the actual dereferencing under the lock
> - add some comments to explain what we're doing
>
> drivers/gpio/gpiolib.c | 41 +++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 41 insertions(+)
Thanks for the patch.
Tested on my system and it fixes the issue.
Reviewed-by: Herve Codina <herve.codina@xxxxxxxxxxx>
Tested-by: Herve Codina <herve.codina@xxxxxxxxxxx>
My old series [1] related to the topic is no more needed and can be thrown
away.
Best regards,
Hervé
[1] https://lore.kernel.org/all/20240227113426.253232-1-herve.codina@xxxxxxxxxxx/