[PATCH] x86_64: Check for too many northbridges in IOMMU code
The IOMMU code can only deal with 8 northbridges. Error out when more are found. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -639,6 +639,14 @@ static int __init pci_iommu_init(void)
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return -1;
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}
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i = 0;
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for_all_nb(dev)
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i++;
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if (i > MAX_NB) {
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printk(KERN_ERR "PCI-GART: Too many northbridges (%ld). Disabled\n", i);
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return -1;
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}
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printk(KERN_INFO "PCI-DMA: using GART IOMMU.\n");
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aper_size = info.aper_size * 1024 * 1024;
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iommu_size = check_iommu_size(info.aper_base, aper_size);
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