linux-kernel - Re: [PATCH v4] pinctrl: mediatek: Fix multiple registration issue.

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Date:	Tue, 25 Aug 2015 17:28:14 -0700
From:	Hongzhou Yang <hongzhou.yang@...iatek.com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Matthias Brugger <matthias.bgg@...il.com>,
	Axel Lin <axel.lin@...ics.com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Antoine Tenart <antoine.tenart@...e-electrons.com>,
	Maoguang Meng <maoguang.meng@...iatek.com>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	Chaotian Jing <chaotian.jing@...iatek.com>,
	<linux-gpio@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <srv_heupstream@...iatek.com>,
	Sascha Hauer <kernel@...gutronix.de>
Subject: Re: [PATCH v4] pinctrl: mediatek: Fix multiple registration issue.

On Tue, 2015-08-25 at 17:16 -0700, Hongzhou Yang wrote:
> Since our common driver need support main chip and PMU
> at the same time, that means it will register two
> pinctrl device, and the pinctrl_desc structure should
> be used two times.
> 
> But pinctrl_desc use global static definition, then
> the latest registered pinctrl device will overwrite
> the old one's, all members in pinctrl_desc will set to
> the new one's, such as name, pins and pins numbers, etc.
> This is a bug. Changing to use devm_kzalloc to fix it.
> 
> Cc: stable@...r.kernel.org # v4.1+
> Signed-off-by: Hongzhou Yang <hongzhou.yang@...iatek.com>
> Reviewed-by: Axel Lin <axel.lin@...ics.com>
> ---
>  Adding pinctrl_desc into mtk_pinctrl, assign new value for each 
>  pinctrl device.
> 
>  drivers/pinctrl/mediatek/pinctrl-mtk-common.c |   21 ++++++++++-----------
>  drivers/pinctrl/mediatek/pinctrl-mtk-common.h |    1 +
>  2 files changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
> index ad1ea16..4a52072 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
> @@ -1202,12 +1202,6 @@ static int mtk_pctrl_build_state(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -static struct pinctrl_desc mtk_pctrl_desc = {
> -	.confops	= &mtk_pconf_ops,
> -	.pctlops	= &mtk_pctrl_ops,
> -	.pmxops		= &mtk_pmx_ops,
> -};
> -
>  int mtk_pctrl_init(struct platform_device *pdev,
>  		const struct mtk_pinctrl_devdata *data,
>  		struct regmap *regmap)
> @@ -1265,12 +1259,17 @@ int mtk_pctrl_init(struct platform_device *pdev,
>  
>  	for (i = 0; i < pctl->devdata->npins; i++)
>  		pins[i] = pctl->devdata->pins[i].pin;
> -	mtk_pctrl_desc.name = dev_name(&pdev->dev);
> -	mtk_pctrl_desc.owner = THIS_MODULE;
> -	mtk_pctrl_desc.pins = pins;
> -	mtk_pctrl_desc.npins = pctl->devdata->npins;
> +
> +	pctl->pctl_desc.name = dev_name(&pdev->dev);
> +	pctl->pctl_desc.owner = THIS_MODULE;
> +	pctl->pctl_desc.pins = pins;
> +	pctl->pctl_desc.npins = pctl->devdata->npins;
> +	pctl->pctl_desc.confops = &mtk_pconf_ops;
> +	pctl->pctl_desc.pctlops = &mtk_pctrl_ops;
> +	pctl->pctl_desc.pmxops = &mtk_pmx_ops;
>  	pctl->dev = &pdev->dev;
> -	pctl->pctl_dev = pinctrl_register(&mtk_pctrl_desc, &pdev->dev, pctl);
> +
> +	pctl->pctl_dev = pinctrl_register(&pctl->pctl_desc, &pdev->dev, pctl);
>  	if (IS_ERR(pctl->pctl_dev)) {
>  		dev_err(&pdev->dev, "couldn't register pinctrl driver\n");
>  		return PTR_ERR(pctl->pctl_dev);
> diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.h b/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
> index 30213e5..c532c23 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
> +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
> @@ -256,6 +256,7 @@ struct mtk_pinctrl_devdata {
>  struct mtk_pinctrl {
>  	struct regmap	*regmap1;
>  	struct regmap	*regmap2;
> +	struct pinctrl_desc pctl_desc;
>  	struct device           *dev;
>  	struct gpio_chip	*chip;
>  	struct mtk_pinctrl_group	*groups;

Please ignore this patch, I will send another one.
Sorry about this.

Yours,
Hongzhou

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