[POWERPC] iommu_free_table doesn't need the device_node

It only needs the iommu_table address.  It also makes use of the node
name to print error messages.  So just pass it the things it needs.
This reduces the places that know about the pci_dn by one.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/iommu.c

@@ -526,16 +526,14 @@ struct iommu_table *iommu_init_table(struct iommu_table *tbl, int nid)
 	return tbl;
 }
 
-void iommu_free_table(struct device_node *dn)
+void iommu_free_table(struct iommu_table *tbl, const char *node_name)
 {
-	struct pci_dn *pdn = dn->data;
-	struct iommu_table *tbl = pdn->iommu_table;
 	unsigned long bitmap_sz, i;
 	unsigned int order;
 
 	if (!tbl || !tbl->it_map) {
 		printk(KERN_ERR "%s: expected TCE map for %s\n", __FUNCTION__,
-				dn->full_name);
+				node_name);
 		return;
 	}
 
@@ -544,7 +542,7 @@ void iommu_free_table(struct device_node *dn)
 	for (i = 0; i < (tbl->it_size/64); i++) {
 		if (tbl->it_map[i] != 0) {
 			printk(KERN_WARNING "%s: Unexpected TCEs for %s\n",
-				__FUNCTION__, dn->full_name);
+				__FUNCTION__, node_name);
 			break;
 		}
 	}

arch/powerpc/platforms/pseries/iommu.c

@@ -556,7 +556,7 @@ static int iommu_reconfig_notifier(struct notifier_block *nb, unsigned long acti
 	case PSERIES_RECONFIG_REMOVE:
 		if (pci && pci->iommu_table &&
 		    of_get_property(np, "ibm,dma-window", NULL))
-			iommu_free_table(np);
+			iommu_free_table(pci->iommu_table, np->full_name);
 		break;
 	default:
 		err = NOTIFY_DONE;

include/asm-powerpc/iommu.h

@@ -69,10 +69,9 @@ struct iommu_table {
 };
 
 struct scatterlist;
-struct device_node;
 
 /* Frees table for an individual device node */
-extern void iommu_free_table(struct device_node *dn);
+extern void iommu_free_table(struct iommu_table *tbl, const char *node_name);
 
 /* Initializes an iommu_table based in values set in the passed-in
  * structure