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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Fri, 26 Nov 2021 12:33:56 +0200
Message-ID: <CAHp75Vf61h9sBRdipM-9A1fiyy6PjSr1b2Fo1+VG09tLbaetWw@mail.gmail.com>
Subject: Re: [PATCH v3 1/2] SPI: Add SPI driver for Sunplus SP7021
To:     =?UTF-8?B?TGggS3VvIOmDreWKm+ixqg==?= <lh.Kuo@sunplus.com>
Cc:     Mark Brown <broonie@kernel.org>, "LH.Kuo" <lhjeff911@gmail.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Rob Herring <robh+dt@kernel.org>,
        linux-spi <linux-spi@vger.kernel.org>,
        devicetree <devicetree@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "dvorkin@tibbo.com" <dvorkin@tibbo.com>,
        "qinjian@cqplus1.com" <qinjian@cqplus1.com>,
        =?UTF-8?B?V2VsbHMgTHUg5ZGC6Iqz6aiw?= <wells.lu@sunplus.com>
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On Fri, Nov 26, 2021 at 9:49 AM Lh Kuo =E9=83=AD=E5=8A=9B=E8=B1=AA <lh.Kuo@=
sunplus.com> wrote:

(Uncommented is okay)

...

> > >         ret =3D devm_request_irq(dev, pspim->mas_irq, sp7021_spi_mas_=
irq
> > >                                                 , IRQF_TRIGGER_RISING=
,
> > > pdev->name, pspim);
> >
> > Ugly indentation.
> >
>
> Amended as follows, is it okay?
>
>         ret =3D devm_request_irq(dev, pspim->mas_irq, sp7021_spi_mas_irq
>                         , IRQF_TRIGGER_RISING, pdev->name, pspim);
>         if (ret)
>                 return ret;

Still not okay. Have you seen this style somewhere in the kernel?
Hint: something is really wrong with comma's location.

...

> > >         pm_runtime_enable(dev);
> > >
> > >         ret =3D devm_spi_register_controller(dev, ctlr);
> >
> > You can't mix non-devm with devm APIs. Either all non-devm, or devm fol=
lowed by non-devm.

>   I don't understand so I need to change to spi_register_controller(ctlr)=
?   why?

I haven't told you that. What I'm saying is this:
1) all calls are devm_*() - OK!
2) all calls are non-devm_*() OK!
3) devm_*() followed by non-devm_*() OK!
4) non-devm_*() call followed by devm_*() call  NOT okay!

You need to fulfil your homework (see plenty of the examples in the
Linux kernel source tree on how to proceed).

> I modified the remove-function as follows. I think devm_spi_register_cont=
roller(dev, ctlr); should be no problem in the probe funciton.

It has ordering issues. That's why 4) above is not okay.

> static int sp7021_spi_controller_remove(struct platform_device *pdev)
> {
>         struct spi_controller *ctlr =3D dev_get_drvdata(&pdev->dev);
>         struct sp7021_spi_ctlr *pspim =3D spi_master_get_devdata(ctlr);
>
>         pm_runtime_disable(&pdev->dev);
>         pm_runtime_set_suspended(&pdev->dev);
>         reset_control_assert(pspim->rstc);
>         clk_disable_unprepare(pspim->spi_clk);
>
>         return 0;
> }

--=20
With Best Regards,
Andy Shevchenko