Re: [PATCH 3/6] ide: small ide_register_port() cleanup

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

> Since it is the second time this ->parent special case bited us in the *ss:
> 
> pmac_ide_macio_attach():
> ...
> 	hw.dev = &mdev->bus->pdev->dev;
> 	hw.parent = &mdev->ofdev.dev;
> ...
> 
> I again wonder what is the reason for having different struct device-s used
> for DBDMA and for device tree on MACIO PMAC controllers.  Maybe there is no
> real reason after all and we can use &mdev->ofdev.dev also for hwif->dev?

Historically, dma_map_* wasn't supported on the macio devs, had to use
the underlying pci dev.

In fact, it might even still be the case. I need to have a look at it
after LCA, though with our current DMA ops, it should be easy to fix.

Cheers,
Ben.