[net-next 10/12] igbvf: after mailbox write, wait for reply

[Jeff Kirsher]

From: Greg Edwards <gedwa...@ddn.com>

Two of the VF mailbox commands were not waiting for a reply from the PF,
which can result in a VF mailbox timeout in the VM for the next command.

Signed-off-by: Greg Edwards <gedwa...@ddn.com>
Tested-by: Aaron Brown <aaron.f.br...@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
---
 drivers/net/ethernet/intel/igbvf/vf.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/igbvf/vf.c 
b/drivers/net/ethernet/intel/igbvf/vf.c
index 528be116184e..1d3aa9adcaa8 100644
--- a/drivers/net/ethernet/intel/igbvf/vf.c
+++ b/drivers/net/ethernet/intel/igbvf/vf.c
@@ -230,6 +230,7 @@ static void e1000_update_mc_addr_list_vf(struct e1000_hw 
*hw,
        u16 *hash_list = (u16 *)&msgbuf[1];
        u32 hash_value;
        u32 cnt, i;
+       s32 ret_val;
 
        /* Each entry in the list uses 1 16 bit word.  We have 30
         * 16 bit words available in our HW msg buffer (minus 1 for the
@@ -250,7 +251,9 @@ static void e1000_update_mc_addr_list_vf(struct e1000_hw 
*hw,
                mc_addr_list += ETH_ALEN;
        }
 
-       mbx->ops.write_posted(hw, msgbuf, E1000_VFMAILBOX_SIZE);
+       ret_val = mbx->ops.write_posted(hw, msgbuf, E1000_VFMAILBOX_SIZE);
+       if (!ret_val)
+               mbx->ops.read_posted(hw, msgbuf, 1);
 }
 
 /**
@@ -293,11 +296,14 @@ void e1000_rlpml_set_vf(struct e1000_hw *hw, u16 max_size)
 {
        struct e1000_mbx_info *mbx = &hw->mbx;
        u32 msgbuf[2];
+       s32 ret_val;
 
        msgbuf[0] = E1000_VF_SET_LPE;
        msgbuf[1] = max_size;
 
-       mbx->ops.write_posted(hw, msgbuf, 2);
+       ret_val = mbx->ops.write_posted(hw, msgbuf, 2);
+       if (!ret_val)
+               mbx->ops.read_posted(hw, msgbuf, 1);
 }
 
 /**
-- 
2.13.3