[PATCH] ppc64: Fix LPAR regression

The recent iommu fix broke booting on some POWER4 and POWER5 LPAR boxes.

It looks like we have been calling the non LPAR iommu_dev_setup on LPAR
machines for a while. The recent iommu fix caused that code path to
fail.

It looks like we just need to hook up the devices iommu_table to the
parents one, so do that instead of calling iommu_dev_setup_pSeries and
crossing the streams.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Author: antonblanchard

arch/ppc64/kernel/pSeries_iommu.c

@@ -525,9 +525,8 @@ static void iommu_dev_setup_pSeriesLP(struct pci_dev *dev)
 	 * slots on POWER4 machines.
 	 */
 	if (dma_window == NULL || pdn->parent == NULL) {
-		/* Fall back to regular (non-LPAR) dev setup */
-		DBG("No dma window for device, falling back to regular setup\n");
-		iommu_dev_setup_pSeries(dev);
+		DBG("No dma window for device, linking to parent\n");
+		PCI_DN(dn)->iommu_table = PCI_DN(pdn)->iommu_table;
 		return;
 	} else {
 		DBG("Found DMA window, allocating table\n");