26 Jun
2023
26 Jun
'23
9:58 a.m.
On Thu, Jun 22, 2023 at 12:12:22PM +0200, Arnd Bergmann wrote:
Change the driver to instead use the physical address as stored in the PCI BAR resource directly. Since 'dev_addr' is a 32-bit address, I think this results in the same truncated address on loongarch but is otherwise closer to portable code and avoids the warning.
This gets rid of the warning, but is still broken. pci_resource_start retuns a resource_size_t, which really is a phys_addr_t, but certainly no DMA address. To map PCI(e) resources for DMA the driver needs to call dma_map_resource.