[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 @@
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);