swiotlb_alloc calls dma_direct_alloc, which can satisfy lower than 32-bit
dma mask requests using GFP_DMA if the architecture supports it. Various
x86 drivers rely on that, so we need to support that. At the same time
the whole kernel expects 32-bit dma mask to just work, so the other magic
in swiotlb_dma_support isn't actually needed either.
Reported-by: Dominik Brodowski <li...@dominikbrodowski.net>
Fixes: 6e4bf5867783 ("x86/dma: Use generic swiotlb_ops")
Signed-off-by: Christoph Hellwig <h...@lst.de>
---
lib/swiotlb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 47aeb04c1997..32aacd0d56a8 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -1087,6 +1087,6 @@ const struct dma_map_ops swiotlb_dma_ops = {
.unmap_sg = swiotlb_unmap_sg_attrs,
.map_page = swiotlb_map_page,
.unmap_page = swiotlb_unmap_page,
- .dma_supported = swiotlb_dma_supported,
+ .dma_supported = dma_direct_supported,
};
#endif /* CONFIG_DMA_DIRECT_OPS */
--
2.16.3
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