[PATCH] iommu/io-pgtable-arm: Clean up faulty sanity check

Christoph Hellwig hch at lst.de
Mon Sep 21 12:09:38 EDT 2020

On Mon, Sep 21, 2020 at 04:08:01PM +0100, Robin Murphy wrote:
> Checking for a nonzero dma_pfn_offset was a quick shortcut to validate
> whether the DMA == phys assumption could hold at all. Checking for a
> non-NULL dma_range_map is not quite equivalent, since a map may be
> present to describe a limited DMA window even without an offset, and
> thus this check can now yield false positives.
> However, it only ever served to short-circuit going all the way through
> to __arm_lpae_alloc_pages(), failing the canonical test there, and
> having a bit more to clean up. As such, we can simply remove it without
> loss of correctness.
> Reported-by: Naresh Kamboju <naresh.kamboju at linaro.org>
> Signed-off-by: Robin Murphy <robin.murphy at arm.com>


applied to the dma-mapping for-next tree.

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