Function platform_device_add_data() will return a negative number(-ENOMEM) when fails to add the platform-specific data, and its return value shall be checked before the following call to function paltform_device_add(). But in function pcf50633_probe(), at drivers/mfd/pcf50633-core.c:254, there is no checking of the return value of platform_device_add_data() at line 315, which may make the following codes run in an unexpected status.
The related codes in pcf50633_probe() are as following.
pcf50633_probe() @@drivers/mfd/pcf50633-core.c:315
 315                platform_device_add_data(pdev, &pdata->reg_init_data[i],
 316                                        sizeof(pdata->reg_init_data[i]));
 317                pcf->regulator_pdev[i] = pdev;
 318
 319                platform_device_add(pdev);

Generally, the return value of function platform_device_add_data() shall be checked to make sure that the add operation succeeds. Like the following codes in another function.
hest_parse_ghes @@drivers/acpi/apei/hest.c:153
 153        rc = platform_device_add_data(ghes_dev, &hest_hdr, sizeof(void *));
 154        if (rc)
 155                goto err;
 156
 157        rc = platform_device_add(ghes_dev);
 158        if (rc)
 159                goto err;

Thank you

RUC_Soft_Sec