bnx2: Fix bug in bnx2_free_tx_skbs().

BugLink: http://bugs.launchpad.net/bugs/1034988

[ Upstream commit c1f5163de417dab01fa9daaf09a74bbb19303f3c ]

In rare cases, bnx2x_free_tx_skbs() can unmap the wrong DMA address
when it gets to the last entry of the tx ring.  We were not using
the proper macro to skip the last entry when advancing the tx index.

Reported-by: Zongyun Lai <zlai@vmware.com>
Reviewed-by: Jeffrey Huang <huangjw@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index 74580bb175f..c9b123c1608 100644
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -5310,7 +5310,7 @@ bnx2_free_tx_skbs(struct bnx2 *bp)
                         int k, last;
 
                         if (skb == NULL) {
-                                j++;
+                                j = NEXT_TX_BD(j);
                                 continue;
                         }
 
@@ -5322,8 +5322,8 @@ bnx2_free_tx_skbs(struct bnx2 *bp)
                         tx_buf->skb = NULL;
 
                         last = tx_buf->nr_frags;
-                        j++;
-                        for (k = 0; k < last; k++, j++) {
+                        j = NEXT_TX_BD(j);
+                        for (k = 0; k < last; k++, j = NEXT_TX_BD(j)) {
                                 tx_buf = &txr->tx_buf_ring[TX_RING_IDX(j)];
                                 dma_unmap_page(&bp->pdev->dev,
                                         dma_unmap_addr(tx_buf, mapping),