linux-kernel - Re: [PATCH] Input: gpio_keys_polled

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Date:   Fri, 21 Oct 2016 12:02:35 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-input@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: gpio_keys_polled - fix DT node reference leak

On Thu, Oct 20, 2016 at 03:06:36PM -0700, Dmitry Torokhov wrote:
> When someone requests button with wakeup (which this driver does not
> support) we should drop reference to the current child device node before
> returning error.
> 
> Note that when we using legacy platform data 'child' stays NULL which
> fwnode_handle_put() handles just fine.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
>  drivers/input/keyboard/gpio_keys_polled.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/input/keyboard/gpio_keys_polled.c b/drivers/input/keyboard/gpio_keys_polled.c
> index 270dcf7..72b3503 100644
> --- a/drivers/input/keyboard/gpio_keys_polled.c
> +++ b/drivers/input/keyboard/gpio_keys_polled.c
> @@ -291,6 +291,7 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
>  
>  		if (button->wakeup) {
>  			dev_err(dev, DRV_NAME " does not support wakeup\n");
> +			fwnode_handle_put(child);

Are you sure this is the right place?

I didn't try to compile this but to me it looks like there is no
variable named "child" in the whole gpio_keys_polled_probe() function.
Unless I'm looking at wrong branch ;-)

>  			return -EINVAL;
>  		}
>  
> -- 
> 2.8.0.rc3.226.g39d4020
> 
> 
> -- 
> Dmitry