iwlegacy: check for dma mapping errors

Handle pci_map_page() errors. This fixes "DMA-API: device driver failed
to check map error" warning.

Reported-by: Zdenek Kabelac <zkabelac@redhat.com>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlegacy/3945-mac.c b/drivers/net/wireless/iwlegacy/3945-mac.c
index 050ce7c..83856d1 100644
--- a/drivers/net/wireless/iwlegacy/3945-mac.c
+++ b/drivers/net/wireless/iwlegacy/3945-mac.c
@@ -1001,12 +1001,12 @@
 	struct list_head *element;
 	struct il_rx_buf *rxb;
 	struct page *page;
+	dma_addr_t page_dma;
 	unsigned long flags;
 	gfp_t gfp_mask = priority;
 
 	while (1) {
 		spin_lock_irqsave(&rxq->lock, flags);
-
 		if (list_empty(&rxq->rx_used)) {
 			spin_unlock_irqrestore(&rxq->lock, flags);
 			return;
@@ -1035,26 +1035,34 @@
 			break;
 		}
 
-		spin_lock_irqsave(&rxq->lock, flags);
-		if (list_empty(&rxq->rx_used)) {
-			spin_unlock_irqrestore(&rxq->lock, flags);
-			__free_pages(page, il->hw_params.rx_page_order);
-			return;
-		}
-		element = rxq->rx_used.next;
-		rxb = list_entry(element, struct il_rx_buf, list);
-		list_del(element);
-		spin_unlock_irqrestore(&rxq->lock, flags);
-
-		rxb->page = page;
 		/* Get physical address of RB/SKB */
-		rxb->page_dma =
+		page_dma =
 		    pci_map_page(il->pci_dev, page, 0,
 				 PAGE_SIZE << il->hw_params.rx_page_order,
 				 PCI_DMA_FROMDEVICE);
 
+		if (unlikely(pci_dma_mapping_error(il->pci_dev, page_dma))) {
+			__free_pages(page, il->hw_params.rx_page_order);
+			break;
+		}
+
 		spin_lock_irqsave(&rxq->lock, flags);
 
+		if (list_empty(&rxq->rx_used)) {
+			spin_unlock_irqrestore(&rxq->lock, flags);
+			pci_unmap_page(il->pci_dev, page_dma,
+				       PAGE_SIZE << il->hw_params.rx_page_order,
+				       PCI_DMA_FROMDEVICE);
+			__free_pages(page, il->hw_params.rx_page_order);
+			return;
+		}
+
+		element = rxq->rx_used.next;
+		rxb = list_entry(element, struct il_rx_buf, list);
+		list_del(element);
+
+		rxb->page = page;
+		rxb->page_dma = page_dma;
 		list_add_tail(&rxb->list, &rxq->rx_free);
 		rxq->free_count++;
 		il->alloc_rxb_page++;
@@ -1284,8 +1292,15 @@
 			    pci_map_page(il->pci_dev, rxb->page, 0,
 					 PAGE_SIZE << il->hw_params.
 					 rx_page_order, PCI_DMA_FROMDEVICE);
-			list_add_tail(&rxb->list, &rxq->rx_free);
-			rxq->free_count++;
+			if (unlikely(pci_dma_mapping_error(il->pci_dev,
+							   rxb->page_dma))) {
+				__il_free_pages(il, rxb->page);
+				rxb->page = NULL;
+				list_add_tail(&rxb->list, &rxq->rx_used);
+			} else {
+				list_add_tail(&rxb->list, &rxq->rx_free);
+				rxq->free_count++;
+			}
 		} else
 			list_add_tail(&rxb->list, &rxq->rx_used);