From: Benjamin Herrenschmidt The g5 iommu code would fill the "iommu_table" member of whatever device node was pointed to by pcidev->sysdata during boot. However, the ppc64 kernel fills that with a pointer to the PHB node which is later replaced "lazily" with a pointer to the real node when calling pci_device_to_OF_node(). In this case, we were thus "losing" the iommu_table pointer. Typical symptom: loss of the SATA when looking at it's /proc entry. This fixes it by forcing the update to the final sysdata pointer when filling up the iommu_table pointers. The "lazy" thing is useless on pmac anyway. --- 25-akpm/arch/ppc64/kernel/pmac_iommu.c | 7 +++++-- 1 files changed, 5 insertions(+), 2 deletions(-) diff -puN arch/ppc64/kernel/pmac_iommu.c~ppc64-g5-iommu-fix arch/ppc64/kernel/pmac_iommu.c --- 25/arch/ppc64/kernel/pmac_iommu.c~ppc64-g5-iommu-fix 2004-03-15 23:20:22.888217856 -0800 +++ 25-akpm/arch/ppc64/kernel/pmac_iommu.c 2004-03-15 23:20:22.891217400 -0800 @@ -289,8 +289,11 @@ void iommu_setup_pmac(void) * things simple. Setup all PCI devices to point to this table */ while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { - dn = PCI_GET_DN(dev); - + /* We must use pci_device_to_OF_node() to make sure that + * we get the real "final" pointer to the device in the + * pci_dev sysdata and not the temporary PHB one + */ + struct device_node *dn = pci_device_to_OF_node(dev); if (dn) dn->iommu_table = &iommu_table_pmac; } _