Re: [PATCH v3 01/11] firmware: raspberrypi: Introduce devm_rpi_firmware_get()

[Nicolas Saenz Julienne]

Hi Bartosz, thanks for the review.

On Thu, 2020-11-05 at 10:13 +0100, Bartosz Golaszewski wrote:
> > +/**
> > + * devm_rpi_firmware_get - Get pointer to rpi_firmware structure.
> > + * @firmware_node:    Pointer to the firmware Device Tree node.
> > + *
> > + * Returns NULL is the firmware device is not ready.
> > + */
> > +struct rpi_firmware *devm_rpi_firmware_get(struct device *dev,
> > +                                          struct device_node *firmware_node)
> > +{
> > +       struct platform_device *pdev = of_find_device_by_node(firmware_node);
> > +       struct rpi_firmware *fw;
> > +
> > +       if (!pdev)
> > +               return NULL;
> > +
> > +       fw = platform_get_drvdata(pdev);
> > +       if (!fw)
> > +               return NULL;
> > +
> > +       if (!refcount_inc_not_zero(&fw->consumers))
> > +               return NULL;
> > +
> > +       if (devm_add_action_or_reset(dev, rpi_firmware_put, fw))
> > +               return NULL;
> > +
> > +       return fw;
> > +}
> > +EXPORT_SYMBOL_GPL(devm_rpi_firmware_get);
> 
> Usually I'd expect the devres variant to simply call
> rpi_firmware_get() and then schedule a release callback which would
> call whatever function is the release counterpart for it currently.
> Devres actions are for drivers which want to schedule some more
> unusual tasks at driver detach. Any reason for designing it this way?

Yes, see patch #8 where I get rid of rpi_firmware_get() altogether after
converting all users to devres. Since there is no use for the vanilla version
of the function anymore, I figured it'd be better to merge everything into
devm_rpi_firmware_get(). That said it's not something I have strong feelings
about.

Regards,
Nicolas

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