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SubjectRe: [PATCH v5 1/3] platform/x86: intel_pmc_core: Convert to a platform_driver
On Thu, Apr 11, 2019 at 6:44 AM Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
>
> On Thu, Apr 11, 2019 at 3:37 AM Rajat Jain <rajatja@google.com> wrote:
> >
> > Convert the intel_pmc_core driver to a platform driver, and attach using
> > the ACPI enumeration method (via the ACPI device "INT33A1").
>
> > cpu_id = x86_match_cpu(intel_pmc_core_ids);
> > if (!cpu_id)
> > return -ENODEV;
> > @@ -888,28 +893,49 @@ static int __init pmc_core_probe(void)
> > mutex_init(&pmcdev->lock);
> > pmcdev->pmc_xram_read_bit = pmc_core_check_read_lock_bit();
> >
> > + dmi_check_system(pmc_core_dmi_table);
> > + platform_set_drvdata(pdev, pmcdev);
> > +
> > err = pmc_core_dbgfs_register(pmcdev);
> > if (err < 0) {
> > - pr_warn(" debugfs register failed.\n");
> > + dev_warn(&pdev->dev, "debugfs register failed.\n");
> > iounmap(pmcdev->regbase);
> > return err;
> > }
> >
> > - dmi_check_system(pmc_core_dmi_table);
> > - pr_info(" initialized\n");
>
> > + dev_info(&pdev->dev, " initialized\n");
> > + device_initialized = true;
>
> First you do something, then print it's done, and not other way around.

done

>
> > +
> > return 0;
> > }
> > -module_init(pmc_core_probe)
> >
> > -static void __exit pmc_core_remove(void)
> > +static int pmc_core_remove(struct platform_device *pdev)
> > {
> > - struct pmc_dev *pmcdev = &pmc;
> > + struct pmc_dev *pmcdev = platform_get_drvdata(pdev);
> >
> > + platform_set_drvdata(pdev, NULL);
> > pmc_core_dbgfs_unregister(pmcdev);
> > mutex_destroy(&pmcdev->lock);
> > iounmap(pmcdev->regbase);
> > + return 0;
> > }
> > -module_exit(pmc_core_remove)
> > +
> > +static const struct acpi_device_id pmc_core_acpi_ids[] = {
> > + {"INT33A1", 0}, /* _HID for Intel Power Engine, _CID PNP0D80*/
> > + { }
> > +};
> > +MODULE_DEVICE_TABLE(acpi, pmc_core_acpi_ids);
> > +
> > +static struct platform_driver pmc_core_driver = {
> > + .driver = {
> > + .name = "pmc_core",
> > + .acpi_match_table = ACPI_PTR(pmc_core_acpi_ids),
> > + },
> > + .probe = pmc_core_probe,
> > + .remove = pmc_core_remove,
> > +};
> > +
> > +module_platform_driver(pmc_core_driver);
>
> So, this patch has a bisectability issue. After it AFAIU some
> platforms will not be able to enumerate the device.
>
> To avoid such you have to reconsider logic behind this conversion, i.e.
> 1. Split the driver to core part and current initialization mechanism
> 2. Add platform driver as a separate module.

done.


>
> --
> With Best Regards,
> Andy Shevchenko

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