Commit 2d0ec7a1 authored by Joerg Roedel's avatar Joerg Roedel
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Revert "iommu/amd: Don't allocate with __GFP_ZERO in alloc_coherent"

This reverts commit 5fc872c7


The DMA-API does not strictly require that the memory
returned by dma_alloc_coherent is zeroed out. For that
another function (dma_zalloc_coherent) should be used. But
all other x86 DMA-API implementation I checked zero out the
memory, so that some drivers rely on it and break when it is

It seems the (driver-)world is not yet ready for this
change, so revert it.
Signed-off-by: default avatarJoerg Roedel <>
parent c65b99f0
......@@ -2930,6 +2930,7 @@ static void *alloc_coherent(struct device *dev, size_t size,
size = PAGE_ALIGN(size);
dma_mask = dev->coherent_dma_mask;
flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
flag |= __GFP_ZERO;
page = alloc_pages(flag | __GFP_NOWARN, get_order(size));
if (!page) {
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