[PATCH] x86: Fix gfp flags for coherent DMA memory allocation

From	Junichi Nomura <j-nomura@ce.jp.nec.com>
Newsgroups	linux.kernel
Subject	[PATCH] x86: Fix gfp flags for coherent DMA memory allocation
Date	2015-09-14 09:50 +0200
Message-ID	<q8wGv-8aY-15@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Commit 6894258eda2f reversed the order of gfp_flags adjustment in
dma_alloc_attrs() for x86 [arch/x86/kernel/pci-dma.c]
As a result, relevant flags set by dma_alloc_coherent_gfp_flags()
is just discarded and causes coherent DMA memory allocation failure
on some devices.

Fixes: 6894258eda2f ("dma-mapping: consolidate dma_{alloc,free}_{attrs,coherent}")
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 84b8ef8..1b55de1 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -131,8 +131,8 @@ void dma_generic_free_coherent(struct device *dev, size_t size, void *vaddr,
 
 bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp)
 {
-	*gfp = dma_alloc_coherent_gfp_flags(*dev, *gfp);
 	*gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
+	*gfp = dma_alloc_coherent_gfp_flags(*dev, *gfp);
 
 	if (!*dev)
 		*dev = &x86_dma_fallback_dev;--
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[PATCH] x86: Fix gfp flags for coherent DMA memory allocation Junichi Nomura <j-nomura@ce.jp.nec.com> - 2015-09-14 09:50 +0200
  Re: [PATCH] x86: Fix gfp flags for coherent DMA memory allocation Junichi Nomura <j-nomura@ce.jp.nec.com> - 2015-09-15 11:40 +0200
  Re: [PATCH] x86: Fix gfp flags for coherent DMA memory allocation Tony Luck <tony.luck@gmail.com> - 2015-09-16 23:50 +0200
  Re: [PATCH] x86: Fix gfp flags for coherent DMA memory allocation Christoph Hellwig <hch@lst.de> - 2015-09-17 02:10 +0200
  [tip:x86/urgent] x86/pci/dma:   Fix gfp flags for coherent DMA memory allocation tip-bot for Junichi Nomura <tipbot@zytor.com> - 2015-09-17 16:30 +0200

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