On Thu, Aug 07, 2025 at 10:45:33AM -0300, Jason Gunthorpe wrote:

On Mon, Aug 04, 2025 at 03:42:50PM +0300, Leon Romanovsky wrote:

quoted

From: Leon Romanovsky <leonro@nvidia.com>

Block layer maps MMIO memory through dma_map_phys() interface
with help of DMA_ATTR_MMIO attribute. There is a need to unmap
that memory with the appropriate unmap function.

Be specific, AFIACT the issue is that on dma_ops platforms the map
will call ops->map_resource for ATTR_MMIO so we must have the unmap
call ops->unmap_resournce

Maybe these patches should be swapped then, as adding ATTR_MMIO seems
like it created this issue?

The best variant will be to squash previous patch "block-dma: properly
take MMIO path", but I don't want to mix them as they for different
kernel areas.

Thanks

Jason