linux-kernel - Re: [v4 2/6] media: platform: dwc: Add MIPI CSI-2 controller driver

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Date:   Mon, 12 Aug 2019 19:50:47 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Luis de Oliveira <Luis.Oliveira@...opsys.com>
Cc:     Sakari Ailus <sakari.ailus@....fi>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Rob Herring <robh@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        "paulmck@...ux.ibm.com" <paulmck@...ux.ibm.com>,
        Mark Rutland <mark.rutland@....com>,
        Kishon Vijay Abraham I <kishon@...com>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Joao Pinto <Joao.Pinto@...opsys.com>
Subject: Re: [v4 2/6] media: platform: dwc: Add MIPI CSI-2 controller driver

On Mon, Aug 12, 2019 at 12:45 PM Luis de Oliveira
<Luis.Oliveira@...opsys.com> wrote:
> From: Andy Shevchenko <andy.shevchenko@...il.com>
> Date: Sat, Aug 10, 2019 at 14:09:21
> > On Fri, Aug 9, 2019 at 5:38 PM Sakari Ailus <sakari.ailus@....fi> wrote:
> > > On Tue, Jun 11, 2019 at 09:20:51PM +0200, Luis Oliveira wrote:

> > > > +     of_id = of_match_node(dw_mipi_csi_of_match, dev->of_node);
> > > > +     if (!of_id)
> > > > +             return -EINVAL;
> >
> > Is it possible to have this asserted?
> >
>
> I will remove it.

But please double check that is really the case.

> > > > +     ret = devm_request_irq(dev, csi->ctrl_irq_number,
> > > > +                            dw_mipi_csi_irq1, IRQF_SHARED,
> > > > +                            dev_name(dev), csi);
> > > > +     if (ret) {
> > > > +             dev_err(dev, "irq csi %s failed\n", of_id->name);
> > > > +
> > > > +             goto end;
> > > > +     }
> >
> > devm_*irq() might be a bad idea. Is it race free in your driver?
> >
>
> I never thought about it like that. Should I use request_irq and
> free_irq?

It's you, author of the driver, who knows it better :-)


> > I told once, can repeat again. Synopsys perhaps needs better reviews
> > inside company. Each time I see the code, it repeats same mistakes
> > over and over. Have you, guys, do something about it?
>
> We are working on it. It will get better, sorry.

Thanks! Hope to see a progress!

-- 
With Best Regards,
Andy Shevchenko