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SubjectRe: [PATCH v2 0/9] x86: handle HW IOMMU initialization failure gracefully
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On Tue, 10 Nov 2009 12:55:55 +0100
Ingo Molnar <mingo@elte.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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