linux-kernel - Re: [PATCH v3 1/2] SPI: Add SPI driver for Sunplus SP7021

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Date:   Fri, 26 Nov 2021 12:33:56 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Lh Kuo 郭力豪 <lh.Kuo@...plus.com>
Cc:     Mark Brown <broonie@...nel.org>, "LH.Kuo" <lhjeff911@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "dvorkin@...bo.com" <dvorkin@...bo.com>,
        "qinjian@...lus1.com" <qinjian@...lus1.com>,
        Wells Lu 呂芳騰 <wells.lu@...plus.com>
Subject: Re: [PATCH v3 1/2] SPI: Add SPI driver for Sunplus SP7021

On Fri, Nov 26, 2021 at 9:49 AM Lh Kuo 郭力豪 <lh.Kuo@...plus.com> wrote:

(Uncommented is okay)

...

> > >         ret = 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 = 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 = devm_spi_register_controller(dev, ctlr);
> >
> > You can't mix non-devm with devm APIs. Either all non-devm, or devm followed 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_controller(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 = dev_get_drvdata(&pdev->dev);
>         struct sp7021_spi_ctlr *pspim = 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;
> }

-- 
With Best Regards,
Andy Shevchenko