Re: [PATCH] PCI/P2PDMA: fix the wrong dma address calculation when map sg

[Logan Gunthorpe]

On 2021-09-08 9:25 p.m., Wang Lu wrote:
> The bus offset is bus address - physical address,
> so the calculation in __pci_p2pdma_map_sg should be:
> bus address = physical address + bus offset.
> 
> Signed-off-by: Wang Lu <wanglu@xxxxxxxxxxxx>

Thanks, yes I believe my math was wrong here.

It was never tested on any machine that has a non-zero bus-offset.

Reviewed-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>