diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index a67e71c49aeb..52548dfb8b45 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -349,7 +349,7 @@ struct dynamic_dma_window_prop {
 	__be32	window_shift;	/* ilog2(tce_window_size) */
 };
 
-struct direct_window {
+struct dma_win {
 	struct device_node *device;
 	const struct dynamic_dma_window_prop *prop;
 	struct list_head list;
@@ -369,11 +369,11 @@ struct ddw_create_response {
 	u32 addr_lo;
 };
 
-static LIST_HEAD(direct_window_list);
+static LIST_HEAD(dma_win_list);
 /* prevents races between memory on/offline and window creation */
-static DEFINE_SPINLOCK(direct_window_list_lock);
+static DEFINE_SPINLOCK(dma_win_list_lock);
 /* protects initializing window twice for same device */
-static DEFINE_MUTEX(direct_window_init_mutex);
+static DEFINE_MUTEX(dma_win_init_mutex);
 #define DIRECT64_PROPNAME "linux,direct64-ddr-window-info"
 #define DMA64_PROPNAME "linux,dma64-ddr-window-info"
 
@@ -713,7 +713,10 @@ static void pci_dma_bus_setup_pSeriesLP(struct pci_bus *bus)
 	pr_debug("pci_dma_bus_setup_pSeriesLP: setting up bus %pOF\n",
 		 dn);
 
-	/* Find nearest ibm,dma-window, walking up the device tree */
+	/*
+	 * Find nearest ibm,dma-window (default DMA window), walking up the
+	 * device tree
+	 */
 	for (pdn = dn; pdn != NULL; pdn = pdn->parent) {
 		dma_window = of_get_property(pdn, "ibm,dma-window", NULL);
 		if (dma_window != NULL)
@@ -822,11 +825,11 @@ static void remove_dma_window(struct device_node *np, u32 *ddw_avail,
 
 	ret = rtas_call(ddw_avail[DDW_REMOVE_PE_DMA_WIN], 1, 1, NULL, liobn);
 	if (ret)
-		pr_warn("%pOF: failed to remove direct window: rtas returned "
+		pr_warn("%pOF: failed to remove DMA window: rtas returned "
 			"%d to ibm,remove-pe-dma-window(%x) %llx\n",
 			np, ret, ddw_avail[DDW_REMOVE_PE_DMA_WIN], liobn);
 	else
-		pr_debug("%pOF: successfully removed direct window: rtas returned "
+		pr_debug("%pOF: successfully removed DMA window: rtas returned "
 			"%d to ibm,remove-pe-dma-window(%x) %llx\n",
 			np, ret, ddw_avail[DDW_REMOVE_PE_DMA_WIN], liobn);
 }
@@ -854,37 +857,37 @@ static int remove_ddw(struct device_node *np, bool remove_prop, const char *win_
 
 	ret = of_remove_property(np, win);
 	if (ret)
-		pr_warn("%pOF: failed to remove direct window property: %d\n",
+		pr_warn("%pOF: failed to remove DMA window property: %d\n",
 			np, ret);
 	return 0;
 }
 
 static bool find_existing_ddw(struct device_node *pdn, u64 *dma_addr, int *window_shift)
 {
-	struct direct_window *window;
-	const struct dynamic_dma_window_prop *direct64;
+	struct dma_win *window;
+	const struct dynamic_dma_window_prop *dma64;
 	bool found = false;
 
-	spin_lock(&direct_window_list_lock);
+	spin_lock(&dma_win_list_lock);
 	/* check if we already created a window and dupe that config if so */
-	list_for_each_entry(window, &direct_window_list, list) {
+	list_for_each_entry(window, &dma_win_list, list) {
 		if (window->device == pdn) {
-			direct64 = window->prop;
-			*dma_addr = be64_to_cpu(direct64->dma_base);
-			*window_shift = be32_to_cpu(direct64->window_shift);
+			dma64 = window->prop;
+			*dma_addr = be64_to_cpu(dma64->dma_base);
+			*window_shift = be32_to_cpu(dma64->window_shift);
 			found = true;
 			break;
 		}
 	}
-	spin_unlock(&direct_window_list_lock);
+	spin_unlock(&dma_win_list_lock);
 
 	return found;
 }
 
-static struct direct_window *ddw_list_new_entry(struct device_node *pdn,
-						const struct dynamic_dma_window_prop *dma64)
+static struct dma_win *ddw_list_new_entry(struct device_node *pdn,
+					  const struct dynamic_dma_window_prop *dma64)
 {
-	struct direct_window *window;
+	struct dma_win *window;
 
 	window = kzalloc(sizeof(*window), GFP_KERNEL);
 	if (!window)
@@ -900,7 +903,7 @@ static void find_existing_ddw_windows_named(const char *name)
 {
 	int len;
 	struct device_node *pdn;
-	struct direct_window *window;
+	struct dma_win *window;
 	const struct dynamic_dma_window_prop *dma64;
 
 	for_each_node_with_property(pdn, name) {
@@ -914,9 +917,9 @@ static void find_existing_ddw_windows_named(const char *name)
 		if (!window)
 			break;
 
-		spin_lock(&direct_window_list_lock);
-		list_add(&window->list, &direct_window_list);
-		spin_unlock(&direct_window_list_lock);
+		spin_lock(&dma_win_list_lock);
+		list_add(&window->list, &dma_win_list);
+		spin_unlock(&dma_win_list_lock);
 	}
 }
 
@@ -1216,7 +1219,7 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
 	const char *win_name;
 	struct device_node *dn;
 	u32 ddw_avail[DDW_APPLICABLE_SIZE];
-	struct direct_window *window;
+	struct dma_win *window;
 	struct property *win64;
 	bool ddw_enabled = false;
 	struct failed_ddw_pdn *fpdn;
@@ -1229,7 +1232,7 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
 	pmem_present = dn != NULL;
 	of_node_put(dn);
 
-	mutex_lock(&direct_window_init_mutex);
+	mutex_lock(&dma_win_init_mutex);
 
 	if (find_existing_ddw(pdn, &dev->dev.archdata.dma_offset, &len)) {
 		direct_mapping = (len >= max_ram_len);
@@ -1309,8 +1312,8 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
 
 	page_shift = iommu_get_page_shift(query.page_size);
 	if (!page_shift) {
-		dev_dbg(&dev->dev, "no supported direct page size in mask %x",
-			  query.page_size);
+		dev_dbg(&dev->dev, "no supported page size in mask %x",
+			query.page_size);
 		goto out_failed;
 	}
 
@@ -1367,7 +1370,7 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
 
 	ret = of_add_property(pdn, win64);
 	if (ret) {
-		dev_err(&dev->dev, "unable to add dma window property for %pOF: %d",
+		dev_err(&dev->dev, "unable to add DMA window property for %pOF: %d",
 			pdn, ret);
 		goto out_free_prop;
 	}
@@ -1381,7 +1384,7 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
 		ret = walk_system_ram_range(0, memblock_end_of_DRAM() >> PAGE_SHIFT,
 					    win64->value, tce_setrange_multi_pSeriesLP_walk);
 		if (ret) {
-			dev_info(&dev->dev, "failed to map direct window for %pOF: %d\n",
+			dev_info(&dev->dev, "failed to map DMA window for %pOF: %d\n",
 				 dn, ret);
 			goto out_del_list;
 		}
@@ -1423,9 +1426,9 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
 		set_iommu_table_base(&dev->dev, newtbl);
 	}
 
-	spin_lock(&direct_window_list_lock);
-	list_add(&window->list, &direct_window_list);
-	spin_unlock(&direct_window_list_lock);
+	spin_lock(&dma_win_list_lock);
+	list_add(&window->list, &dma_win_list);
+	spin_unlock(&dma_win_list_lock);
 
 	dev->dev.archdata.dma_offset = win_addr;
 	ddw_enabled = true;
@@ -1456,7 +1459,7 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
 	list_add(&fpdn->list, &failed_ddw_pdn_list);
 
 out_unlock:
-	mutex_unlock(&direct_window_init_mutex);
+	mutex_unlock(&dma_win_init_mutex);
 
 	/*
 	 * If we have persistent memory and the window size is only as big
@@ -1554,29 +1557,29 @@ static bool iommu_bypass_supported_pSeriesLP(struct pci_dev *pdev, u64 dma_mask)
 static int iommu_mem_notifier(struct notifier_block *nb, unsigned long action,
 		void *data)
 {
-	struct direct_window *window;
+	struct dma_win *window;
 	struct memory_notify *arg = data;
 	int ret = 0;
 
 	switch (action) {
 	case MEM_GOING_ONLINE:
-		spin_lock(&direct_window_list_lock);
-		list_for_each_entry(window, &direct_window_list, list) {
+		spin_lock(&dma_win_list_lock);
+		list_for_each_entry(window, &dma_win_list, list) {
 			ret |= tce_setrange_multi_pSeriesLP(arg->start_pfn,
 					arg->nr_pages, window->prop);
 			/* XXX log error */
 		}
-		spin_unlock(&direct_window_list_lock);
+		spin_unlock(&dma_win_list_lock);
 		break;
 	case MEM_CANCEL_ONLINE:
 	case MEM_OFFLINE:
-		spin_lock(&direct_window_list_lock);
-		list_for_each_entry(window, &direct_window_list, list) {
+		spin_lock(&dma_win_list_lock);
+		list_for_each_entry(window, &dma_win_list, list) {
 			ret |= tce_clearrange_multi_pSeriesLP(arg->start_pfn,
 					arg->nr_pages, window->prop);
 			/* XXX log error */
 		}
-		spin_unlock(&direct_window_list_lock);
+		spin_unlock(&dma_win_list_lock);
 		break;
 	default:
 		break;
@@ -1597,7 +1600,7 @@ static int iommu_reconfig_notifier(struct notifier_block *nb, unsigned long acti
 	struct of_reconfig_data *rd = data;
 	struct device_node *np = rd->dn;
 	struct pci_dn *pci = PCI_DN(np);
-	struct direct_window *window;
+	struct dma_win *window;
 
 	switch (action) {
 	case OF_RECONFIG_DETACH_NODE:
@@ -1615,15 +1618,15 @@ static int iommu_reconfig_notifier(struct notifier_block *nb, unsigned long acti
 			iommu_pseries_free_group(pci->table_group,
 					np->full_name);
 
-		spin_lock(&direct_window_list_lock);
-		list_for_each_entry(window, &direct_window_list, list) {
+		spin_lock(&dma_win_list_lock);
+		list_for_each_entry(window, &dma_win_list, list) {
 			if (window->device == np) {
 				list_del(&window->list);
 				kfree(window);
 				break;
 			}
 		}
-		spin_unlock(&direct_window_list_lock);
+		spin_unlock(&dma_win_list_lock);
 		break;
 	default:
 		err = NOTIFY_DONE;
