linux-kernel - [tip:x86/urgent] x86: Move swiotlb initialization before dma32_free

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Message-ID: <tip-f4780ca005404166cc40af77ef0e86132ab98a81@git.kernel.org>
Date:	Mon, 14 Dec 2009 09:48:46 GMT
From:	tip-bot for FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	fujita.tomonori@....ntt.co.jp, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:x86/urgent] x86: Move swiotlb initialization before dma32_free_bootmem

Commit-ID:  f4780ca005404166cc40af77ef0e86132ab98a81
Gitweb:     http://git.kernel.org/tip/f4780ca005404166cc40af77ef0e86132ab98a81
Author:     FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
AuthorDate: Mon, 14 Dec 2009 11:52:14 +0900
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 14 Dec 2009 08:57:40 +0100

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>
Cc: yinghai@...nel.org
LKML-Reference: <1260759135-6450-2-git-send-email-fujita.tomonori@....ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 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();
--
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