linux-kernel - Re: [PATCH v2 0/9] x86: handle HW IOMMU initialization failure gracefully

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Message-Id: <20091110213459P.fujita.tomonori@lab.ntt.co.jp>
Date:	Tue, 10 Nov 2009 21:35:17 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	mingo@...e.hu
Cc:	fujita.tomonori@....ntt.co.jp, linux-kernel@...r.kernel.org,
	chrisw@...s-sol.org, dwmw2@...radead.org, joerg.roedel@....com,
	muli@...ibm.com
Subject: Re: [PATCH v2 0/9] x86: handle HW IOMMU initialization failure
 gracefully

On Tue, 10 Nov 2009 12:55:55 +0100
Ingo Molnar <mingo@...e.hu> wrote:

> 
> hm, one of the swiotlb patches caused this bootup crash:

Sorry about that. I totally forgot about x86_32.

the following patch fixes this? Sorry that I'm away from the workplace
and can't test it.

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index a234e63..63eebee 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -129,6 +129,8 @@ void __init pci_iommu_alloc(void)
 #ifdef CONFIG_X86_64
 	/* free the range so iommu could get some range less than 4G */
 	dma32_free_bootmem();
+#else
+	dma_ops = &nommu_dma_ops;
 #endif
 	pci_swiotlb_init();
 	if (use_swiotlb)
--
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