linux-kernel - Re: [PATCH] extcon: gpio: Request gpio pin before modifying its state

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Message-id: <52945409.5040502@samsung.com>
Date:	Tue, 26 Nov 2013 16:55:53 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-kernel@...r.kernel.org,
	MyungJoo Ham <myungjoo.ham@...sung.com>
Subject: Re: [PATCH] extcon: gpio: Request gpio pin before modifying its state

Hi Guenter,

On 11/23/2013 02:26 AM, Guenter Roeck wrote:
> Commit 338de0ca (extcon: gpio: Use gpio driver/chip debounce if supported)
> introduced a call to gpio_set_debounce() before actually requesting the
> respective gpio pin from the gpio subsystem.
> 
> The gpio subsystem expects that a gpio pin was requested before modifying its
> state. Not doing so results in a warning from gpiolib, and the gpio pin is
> auto-requested. This in turn causes the subsequent devm_gpio_request_one()
> to fail. So devm_gpio_request_one() must be called prior to calling
> gpio_set_debounce().
> 
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>  drivers/extcon/extcon-gpio.c |   11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 

Applid it on extcon-next branch.

Thanks,
Chanwoo Choi

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