Re: [PATCH] gpio: Add Intel Granite Rapids-D vGPIO driver

[Bartosz Golaszewski]

On Sat, Apr 20, 2024 at 12:02 AM Andy Shevchenko
<andy.shevchenko@xxxxxxxxx> wrote:
>
> On Fri, Apr 19, 2024 at 11:00 PM Elliott, Robert (Servers)
> <elliott@xxxxxxx> wrote:
> > > -----Original Message-----
> > > From: Aapo Vienamo <aapo.vienamo@xxxxxxxxxxxxxxx>
> > > Sent: Friday, April 19, 2024 3:06 AM
>
> ...
>
> > > +static int gnr_gpio_probe(struct platform_device *pdev)
> > > +{
> > > +     size_t num_backup_pins = IS_ENABLED(CONFIG_PM_SLEEP) ? GNR_NUM_PINS
> > > : 0;
> > > +     struct device *dev = &pdev->dev;
> > > +     struct gpio_irq_chip *girq;
> > > +     struct gnr_gpio *priv;
> > > +     void __iomem *regs;
> > > +     int irq, ret;
> > > +
> > > +     priv = devm_kzalloc(dev, struct_size(priv, pad_backup,
> > > num_backup_pins), GFP_KERNEL);
> > > +     if (!priv)
> > > +             return -ENOMEM;
> > > +
> > > +     regs = devm_platform_ioremap_resource(pdev, 0);
> > > +     if (IS_ERR(regs))
> > > +             return PTR_ERR(regs);
> > > +
> > > +     irq = platform_get_irq(pdev, 0);
> > > +     if (irq < 0)
> > > +             return irq;
> > > +
> > > +     ret = devm_request_irq(dev, irq, gnr_gpio_irq, IRQF_SHARED |
> > > IRQF_NO_THREAD,
> > > +                            dev_name(dev), priv);
> > > +     if (ret)
> > > +             return dev_err_probe(dev, ret, "failed to request interrupt\n");
> >
> > All of these early returns will leave the memory allocated to priv
> > forever, since priv isn't saved anywhere until:
>
> > > +     platform_set_drvdata(pdev, priv);
>
> I'm not sure I got your comment right. Do you think there is a memory
> leak on the error paths above? If so, can you elaborate, because I
> don't see it?
>

Elliott: if probe fails and we return, all devm_ resources will be
released. I don't see any error in this code either.

Bart