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

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Message-ID: <1439407199.38706.3.camel@mussux00.eus.mediatek.inc>
Date:	Wed, 12 Aug 2015 12:19:59 -0700
From:	Hongzhou Yang <hongzhou.yang@...iatek.com>
To:	Daniel Kurtz <djkurtz@...omium.org>
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, 2015-08-11 at 15:45 +0800, Daniel Kurtz wrote:
> 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

Ok, I will send another patch to fix them, thank you.

Yours,
Hongzhou


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