arm64: dma-mapping: Fix dma_mapping_error() when bypassing SWIOTLB

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commit adbe7e26f4 upstream.

When bypassing SWIOTLB on small-memory systems, we need to avoid calling
into swiotlb_dma_mapping_error() in exactly the same way as we avoid
swiotlb_dma_supported(), because the former also relies on SWIOTLB state
being initialised.

Under the assumptions for which we skip SWIOTLB, dma_map_{single,page}()
will only ever return the DMA-offset-adjusted physical address of the
page passed in, thus we can report success unconditionally.

Fixes: b67a8b29df ("arm64: mm: only initialize swiotlb when necessary")
CC: Jisheng Zhang <jszhang@marvell.com>
Reported-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Robin Murphy 2017-01-25 18:31:31 +00:00 • committed by Greg Kroah-Hartman

parent ac4c8fcf5e

commit a8123045c9

1 changed files with 8 additions and 1 deletions

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arch/arm64/mm/dma-mapping.c

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