Replying to my own patch with two more questions: On 08/11/2019 05:36 PM, Max Staudt wrote: > - /* allocate host */ > - host = ata_host_alloc(&z->dev, nr_ports); Actually, this is an issue even the existing pata_buddha has: ata_host_alloc() will dev_set_drvdata(dev, host) which is fine on Buddha and Catweasel, but conflicts with zorro8390's own dev_set_drvdata() on an X-Surf board. Thus, if both pata_buddha and zorro8390 are active, only one can be unloaded. The original ide/buddha driver does not have this problem as far as I can see. This should be resolved once we get around to MFD support, as Geert suggested. Shall we leave this as-is, as it's not really a change from the status quo in pata_buddha? > +static int __init pata_buddha_late_init(void) > +{ > + struct zorro_dev *z = NULL; > + > + pr_info("pata_buddha: Scanning for stand-alone IDE controllers...\n"); > + zorro_register_driver(&pata_buddha_driver); > + > + pr_info("pata_buddha: Scanning for X-Surf boards...\n"); > + while ((z = zorro_find_device(ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, z))) { > + static struct zorro_device_id xsurf_ent = > + { ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, BOARD_XSURF}; > + > + pata_buddha_probe(z, &xsurf_ent); > + } > + > + return 0; > +} This is suboptimal, as we don't release memory in case pata_buddha_probe() fails. Any suggestions? > +static void __exit pata_buddha_exit(void) > +{ > + struct zorro_dev *z = NULL; > + > + pr_info("pata_buddha: Releasing X-Surf boards...\n"); > + while ((z = zorro_find_device(ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, z))) { > + struct ata_host *host = dev_get_drvdata(&z->dev); > + > + if (host) > + ata_host_detach(host); > + } I guess that here we also need to manually release the resources we allocated with devm_* above. Any ideas? Thanks Max