linux-kernel - [PATCH 1/2] x86: move swiotlb initialization before dma32_free

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Date:	Mon, 14 Dec 2009 11:52:14 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	mingo@...e.hu
Cc:	yinghai@...nel.org, linux-kernel@...r.kernel.org,
	fujita.tomonori@....ntt.co.jp
Subject: [PATCH 1/2] x86: move swiotlb initialization before dma32_free_bootmem

The commit 75f1cdf1dda92cae037ec848ae63690d91913eac introduced a bug
that we initialize SWIOTLB right after dma32_free_bootmem so we
wrongly steal memory area allocated for GART with broken BIOS earlier.

This moves swiotlb initialization before dma32_free_bootmem().

Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
---
 arch/x86/kernel/pci-dma.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index afcc58b..fcc2f2b 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -120,11 +120,14 @@ static void __init dma32_free_bootmem(void)
 
 void __init pci_iommu_alloc(void)
 {
+	int use_swiotlb;
+
+	use_swiotlb = pci_swiotlb_init();
 #ifdef CONFIG_X86_64
 	/* free the range so iommu could get some range less than 4G */
 	dma32_free_bootmem();
 #endif
-	if (pci_swiotlb_init())
+	if (use_swiotlb)
 		return;
 
 	gart_iommu_hole_init();
-- 
1.5.6.5

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