1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/ixgbe/ixgbe_fcoe.c b/drivers/net/ixgbe/ixgbe_fcoe.c
index 26dd27479e2c..6342d4859790 100644
--- a/drivers/net/ixgbe/ixgbe_fcoe.c
+++ b/drivers/net/ixgbe/ixgbe_fcoe.c
@@ -92,6 +92,7 @@ int ixgbe_fcoe_ddp_put(struct net_device *netdev, u16 xid)
         struct ixgbe_fcoe *fcoe;
         struct ixgbe_adapter *adapter;
         struct ixgbe_fcoe_ddp *ddp;
+        u32 fcbuff;
 
         if (!netdev)
                 goto out_ddp_put;
@@ -115,7 +116,14 @@ int ixgbe_fcoe_ddp_put(struct net_device *netdev, u16 xid)
                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCBUFF, 0);
                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCDMARW,
                                 (xid | IXGBE_FCDMARW_WE));
+
+                /* guaranteed to be invalidated after 100us */
+                IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCDMARW,
+                                (xid | IXGBE_FCDMARW_RE));
+                fcbuff = IXGBE_READ_REG(&adapter->hw, IXGBE_FCBUFF);
                 spin_unlock_bh(&fcoe->lock);
+                if (fcbuff & IXGBE_FCBUFF_VALID)
+                        udelay(100);
         }
         if (ddp->sgl)
                 pci_unmap_sg(adapter->pdev, ddp->sgl, ddp->sgc,