linux-kernel - Re: [PATCH] gpiolib: unexport requested gpios on gpiochip removal

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Date:	Wed, 10 Jun 2015 19:29:49 +0200
From:	Johan Hovold <johan@...nel.org>
To:	Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	linux-gpio <linux-gpio@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Patrick Titiano <ptitiano@...libre.com>,
	Benoit Cousson <bcousson@...libre.com>
Subject: Re: [PATCH] gpiolib: unexport requested gpios on gpiochip removal

Hi Bartosz,

On Wed, Jun 10, 2015 at 04:34:21PM +0200, Bartosz Golaszewski wrote:
> When a GPIO expander device is removed - e.g. via i2c-adapter
> new_device/delete_device interface - with some GPIOs still requested,
> gpiochip_remove() function will emit a warning but remove the chip
> anyway.
> 
> If we then reinstantiate this device and try to export any of the GPIOs
> still requested on gpiochip deletion the following warning will be
> emitted:

For GPIOs exported through sysfs, this has already been fixed by commit
483d82110879 ("gpio: sysfs: fix memory leaks and device hotplug"), which
has also been backported to stable.

Thanks,
Johan
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