linux-kernel - RE: [PATCH v2] usb: ehci-s5p: Use devm for requesting ehci_vbus

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Date:	Mon, 25 Mar 2013 18:29:17 +0900
From:	Kukjin Kim <kgene.kim@...sung.com>
To:	'Doug Anderson' <dianders@...omium.org>,
	'Felipe Balbi' <balbi@...com>
Cc:	'Alexander Graf' <agraf@...e.de>,
	'Vivek Gautam' <gautam.vivek@...sung.com>,
	'Jingoo Han' <jg1.han@...sung.com>,
	'Alan Stern' <stern@...land.harvard.edu>,
	'Greg Kroah-Hartman' <gregkh@...uxfoundation.org>,
	'Thomas Abraham' <thomas.abraham@...aro.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: RE: [PATCH v2] usb: ehci-s5p: Use devm for requesting ehci_vbus_gpio

Doug Anderson wrote:
> 
> The ehci_vbus_gpio is requested but never freed.  This can cause
> problems with deferred probes and would cause problems if
> s5p_ehci_remove was ever called.  Use devm to fix this.
> 
> Signed-off-by: Doug Anderson <dianders@...omium.org>

Acked-by: Kukjin Kim <kgene.kim@...sung.com>

Thanks.

- Kukjin

> ---
> Changes in v2:
> - &pdev->dev => dev elsewhere in s5p_setup_vbus_gpio()
> 
>  drivers/usb/host/ehci-s5p.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/usb/host/ehci-s5p.c b/drivers/usb/host/ehci-s5p.c
> index 20ebf6a..738490e 100644
> --- a/drivers/usb/host/ehci-s5p.c
> +++ b/drivers/usb/host/ehci-s5p.c
> @@ -92,20 +92,21 @@ static void s5p_ehci_phy_disable(struct s5p_ehci_hcd
> *s5p_ehci)
> 
>  static void s5p_setup_vbus_gpio(struct platform_device *pdev)
>  {
> +	struct device *dev = &pdev->dev;
>  	int err;
>  	int gpio;
> 
> -	if (!pdev->dev.of_node)
> +	if (!dev->of_node)
>  		return;
> 
> -	gpio = of_get_named_gpio(pdev->dev.of_node,
> -			"samsung,vbus-gpio", 0);
> +	gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
>  	if (!gpio_is_valid(gpio))
>  		return;
> 
> -	err = gpio_request_one(gpio, GPIOF_OUT_INIT_HIGH, "ehci_vbus_gpio");
> +	err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
> +				    "ehci_vbus_gpio");
>  	if (err)
> -		dev_err(&pdev->dev, "can't request ehci vbus gpio %d",
gpio);
> +		dev_err(dev, "can't request ehci vbus gpio %d", gpio);
>  }
> 
>  static u64 ehci_s5p_dma_mask = DMA_BIT_MASK(32);
> --
> 1.8.1.3

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