e1000e: Add code to check return values on NVM accesses

Adding code to check and respond to previously ignored return values
from NVM access functions.

Issue discovered through static analysis.

Signed-off-by: Dave Ertman <david.m.ertman@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/net/ethernet/intel/e1000e/manage.c b/drivers/net/ethernet/intel/e1000e/manage.c
index cb37ff1f1321..58856032298d 100644
--- a/drivers/net/ethernet/intel/e1000e/manage.c
+++ b/drivers/net/ethernet/intel/e1000e/manage.c
@@ -327,9 +327,12 @@ bool e1000e_enable_mng_pass_thru(struct e1000_hw *hw)
         } else if ((hw->mac.type == e1000_82574) ||
                    (hw->mac.type == e1000_82583)) {
                 u16 data;
+                s32 ret_val;
 
                 factps = er32(FACTPS);
-                e1000_read_nvm(hw, NVM_INIT_CONTROL2_REG, 1, &data);
+                ret_val = e1000_read_nvm(hw, NVM_INIT_CONTROL2_REG, 1, &data);
+                if (ret_val)
+                        return false;
 
                 if (!(factps & E1000_FACTPS_MNGCG) &&
                     ((data & E1000_NVM_INIT_CTRL2_MNGM) ==