From: Andi Kleen <ak@suse.de>
Date: Mon, 8 May 2006 13:17:19 +0000 (+0200)
Subject: [PATCH] x86_64: Check for too many northbridges in IOMMU code
X-Git-Tag: v2.6.17-rc4~19
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5192d84e4c32cd335fd572e5ff0712041f45f7e7;p=platform%2Fkernel%2Flinux-3.10.git

[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>
---

diff --git a/arch/x86_64/kernel/pci-gart.c b/arch/x86_64/kernel/pci-gart.c
index 9d3d76c..2480d3f 100644
--- a/arch/x86_64/kernel/pci-gart.c
+++ b/arch/x86_64/kernel/pci-gart.c
@@ -639,6 +639,14 @@ static int __init pci_iommu_init(void)
 		return -1;
 	}
 
+	i = 0;
+	for_all_nb(dev)
+		i++;
+	if (i > MAX_NB) {
+		printk(KERN_ERR "PCI-GART: Too many northbridges (%ld). Disabled\n", i);
+		return -1;
+	}
+
 	printk(KERN_INFO "PCI-DMA: using GART IOMMU.\n");
 	aper_size = info.aper_size * 1024 * 1024;	
 	iommu_size = check_iommu_size(info.aper_base, aper_size);