linux-kernel - [tip:x86/urgent] x86/pci/dma: Fix gfp flags for coherent DMA memory allocation

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Date:	Thu, 17 Sep 2015 07:27:47 -0700
From:	tip-bot for Junichi Nomura <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	tony.luck@...el.com, mingo@...nel.org, hch@....de,
	linux-kernel@...r.kernel.org, hpa@...or.com,
	j-nomura@...jp.nec.com, tglx@...utronix.de
Subject: [tip:x86/urgent] x86/pci/dma:
  Fix gfp flags for coherent DMA memory allocation

Commit-ID:  590f07874e8e3c83729b919312c65aea2533c8cf
Gitweb:     http://git.kernel.org/tip/590f07874e8e3c83729b919312c65aea2533c8cf
Author:     Junichi Nomura <j-nomura@...jp.nec.com>
AuthorDate: Mon, 14 Sep 2015 07:38:36 +0000
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Thu, 17 Sep 2015 16:22:11 +0200

x86/pci/dma: Fix gfp flags for coherent DMA memory allocation

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() are just
discarded and cause 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@...jp.nec.com>
Tested-by: Tony Luck <tony.luck@...el.com>
Acked-by: Christoph Hellwig <hch@....de>
Link: http://lkml.kernel.org/r/20150914073834.GA13077@xzibit.linux.bs1.fc.nec.co.jp
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 arch/x86/kernel/pci-dma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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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