be2net: add dma_mapping_error() check for dma_map_page()

The driver does not check value returned by dma_map_page. The patch
fixes this.

v2: Removed the bugfix for non-bug ;-) (thanks Sathya)

Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Acked-by: Sathya Perla <Sathya.perla@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index bf40fdaecfa3..a37039d353c5 100644
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -1776,6 +1776,7 @@ static void be_post_rx_frags(struct be_rx_obj *rxo, gfp_t gfp)
         struct be_rx_page_info *page_info = NULL, *prev_page_info = NULL;
         struct be_queue_info *rxq = &rxo->q;
         struct page *pagep = NULL;
+        struct device *dev = &adapter->pdev->dev;
         struct be_eth_rx_d *rxd;
         u64 page_dmaaddr = 0, frag_dmaaddr;
         u32 posted, page_offset = 0;
@@ -1788,9 +1789,15 @@ static void be_post_rx_frags(struct be_rx_obj *rxo, gfp_t gfp)
                                 rx_stats(rxo)->rx_post_fail++;
                                 break;
                         }
-                        page_dmaaddr = dma_map_page(&adapter->pdev->dev, pagep,
-                                                    0, adapter->big_page_size,
+                        page_dmaaddr = dma_map_page(dev, pagep, 0,
+                                                    adapter->big_page_size,
                                                     DMA_FROM_DEVICE);
+                        if (dma_mapping_error(dev, page_dmaaddr)) {
+                                put_page(pagep);
+                                pagep = NULL;
+                                rx_stats(rxo)->rx_post_fail++;
+                                break;
+                        }
                         page_info->page_offset = 0;
                 } else {
                         get_page(pagep);