[net 07/11] ixgbevf: fix error code path when setting MAC address

[Jeff Kirsher]

From: Emil Tantilov <emil.s.tanti...@intel.com>

Return error when a MAC address change is rejected by the PF.

This will prevent the user from modifying the MAC address when
that operation is not permitted.

Signed-off-by: Emil Tantilov <emil.s.tanti...@intel.com>
Tested-by: Andrew Bowers <andrewx.bow...@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
---
 drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 12 ++++++++----
 drivers/net/ethernet/intel/ixgbevf/vf.c           |  4 +++-
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c 
b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 6a337bb..b0edae9 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -3692,19 +3692,23 @@ static int ixgbevf_set_mac(struct net_device *netdev, 
void *p)
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);
        struct ixgbe_hw *hw = &adapter->hw;
        struct sockaddr *addr = p;
+       int err;
 
        if (!is_valid_ether_addr(addr->sa_data))
                return -EADDRNOTAVAIL;
 
-       ether_addr_copy(netdev->dev_addr, addr->sa_data);
-       ether_addr_copy(hw->mac.addr, addr->sa_data);
-
        spin_lock_bh(&adapter->mbx_lock);
 
-       hw->mac.ops.set_rar(hw, 0, hw->mac.addr, 0);
+       err = hw->mac.ops.set_rar(hw, 0, addr->sa_data, 0);
 
        spin_unlock_bh(&adapter->mbx_lock);
 
+       if (err)
+               return -EPERM;
+
+       ether_addr_copy(hw->mac.addr, addr->sa_data);
+       ether_addr_copy(netdev->dev_addr, addr->sa_data);
+
        return 0;
 }
 
diff --git a/drivers/net/ethernet/intel/ixgbevf/vf.c 
b/drivers/net/ethernet/intel/ixgbevf/vf.c
index 61a98f4..4d613a4 100644
--- a/drivers/net/ethernet/intel/ixgbevf/vf.c
+++ b/drivers/net/ethernet/intel/ixgbevf/vf.c
@@ -408,8 +408,10 @@ static s32 ixgbevf_set_rar_vf(struct ixgbe_hw *hw, u32 
index, u8 *addr,
 
        /* if nacked the address was rejected, use "perm_addr" */
        if (!ret_val &&
-           (msgbuf[0] == (IXGBE_VF_SET_MAC_ADDR | IXGBE_VT_MSGTYPE_NACK)))
+           (msgbuf[0] == (IXGBE_VF_SET_MAC_ADDR | IXGBE_VT_MSGTYPE_NACK))) {
                ixgbevf_get_mac_addr_vf(hw, hw->mac.addr);
+               return IXGBE_ERR_MBX;
+       }
 
        return ret_val;
 }
-- 
2.5.5