Re: [PATCH v1 1/2] PCI: dwc: drop dependency on ZONE_DMA32

[William McVicker]

On 08/11/2022, Christoph Hellwig wrote:
> On Tue, Aug 09, 2022 at 06:00:49PM +0000, Will McVicker wrote:
> > Re-work the msi_msg DMA allocation logic to use dma_alloc_coherent()
> > which uses the coherent DMA mask to try and return an allocation within
> > the DMA mask limits. This allows kernel configurations that disable
> > ZONE_DMA32 to continue supporting a 32-bit DMA mask. Without this patch,
> > the PCIe host device will fail to probe when ZONE_DMA32 is disabled.
> 
> > +		dma_free_coherent(dev, PAGE_SIZE, pp->msi_page, pp->msi_data);
> 
> Isn't msi_page a struct page * which should become a void * now?
> 
> Otherwise this looks good and is what the driver should have done
> from the very beginning.

I've updated this in v3 to use dmam_alloc_coherent() and dropped msi_page
since it's not actually used. So this block is dropped now. Thanks for
taking a look though!

--Will