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Message-ID: <CAGS+omAE2AXpwnYtvetcjvP_6jUbE2HDuPfKfy=aLook2M-8LQ@mail.gmail.com>
Date: Tue, 11 Aug 2015 15:45:21 +0800
From: Daniel Kurtz <djkurtz@...omium.org>
To: Hongzhou Yang <hongzhou.yang@...iatek.com>
Cc: Linus Walleij <linus.walleij@...aro.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Maoguang Meng <maoguang.meng@...iatek.com>,
Axel Lin <axel.lin@...ics.com>, linux-gpio@...r.kernel.org,
Antoine Tenart <antoine.tenart@...e-electrons.com>,
Eddie Huang (黃智傑)
<eddie.huang@...iatek.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
linux-mediatek@...ts.infradead.org,
Sascha Hauer <kernel@...gutronix.de>,
Yingjoe Chen <yingjoe.chen@...iatek.com>,
biao.huang@...iatek.com, dandan.he@...iatek.com,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] pinctrl: mediatek: Fix multiple registeration issue.
On Tue, Aug 11, 2015 at 12:49 PM, Hongzhou Yang
<hongzhou.yang@...iatek.com> wrote:
> Use dynamic allocation to fix multiple registeration issue.
s/registeration/registration - here and in the patch subject.
>
> --------------8<--------------------
I don't think this is required.
> 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>
> ---
> drivers/pinctrl/mediatek/pinctrl-mtk-common.c | 27 +++++++++++++++----------
> 1 file changed, 16 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
> index ad1ea16..2bba504 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
> @@ -1202,17 +1202,12 @@ 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)
> {
> struct pinctrl_pin_desc *pins;
> + struct pinctrl_desc *mtk_pctrl_desc;
> struct mtk_pinctrl *pctl;
> struct device_node *np = pdev->dev.of_node, *node;
> struct property *prop;
> @@ -1265,12 +1260,22 @@ 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;
> +
> + mtk_pctrl_desc = devm_kzalloc(&pdev->dev, sizeof(*mtk_pctrl_desc),
> + GFP_KERNEL);
> + if (!mtk_pctrl_desc)
> + return -ENOMEM;
Just embed a struct pinctrl_desc in your struct mtk_pinctrl.
Best Regards,
-Dan
> +
> + 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;
> + mtk_pctrl_desc->confops = &mtk_pconf_ops;
> + mtk_pctrl_desc->pctlops = &mtk_pctrl_ops;
> + mtk_pctrl_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(mtk_pctrl_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);
> --
> 1.7.9.5
>
>
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek
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