1 files changed, 15 insertions, 2 deletions

diff --git a/drivers/net/ethernet/intel/e1000e/ethtool.c b/drivers/net/ethernet/intel/e1000e/ethtool.c
index 4f1edd9c22f1..d863075df7a4 100644
--- a/drivers/net/ethernet/intel/e1000e/ethtool.c
+++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
@@ -773,6 +773,7 @@ static int e1000_reg_test(struct e1000_adapter *adapter, u64 *data)
         u32 i;
         u32 toggle;
         u32 mask;
+        u32 wlock_mac = 0;
 
         /*
          * The status register is Read Only, so a write should fail.
@@ -838,19 +839,31 @@ static int e1000_reg_test(struct e1000_adapter *adapter, u64 *data)
         case e1000_ich10lan:
         case e1000_pchlan:
         case e1000_pch2lan:
+        case e1000_pch_lpt:
                 mask |= (1 << 18);
                 break;
         default:
                 break;
         }
-        for (i = 0; i < mac->rar_entry_count; i++)
+
+        if (mac->type == e1000_pch_lpt)
+                wlock_mac = (er32(FWSM) & E1000_FWSM_WLOCK_MAC_MASK) >>
+                    E1000_FWSM_WLOCK_MAC_SHIFT;
+
+        for (i = 0; i < mac->rar_entry_count; i++) {
+                /* Cannot test write-protected SHRAL[n] registers */
+                if ((wlock_mac == 1) || (wlock_mac && (i > wlock_mac)))
+                        continue;
+
                 REG_PATTERN_TEST_ARRAY(E1000_RA, ((i << 1) + 1),
-                                       mask, 0xFFFFFFFF);
+                                       mask, 0xFFFFFFFF);
+        }
 
         for (i = 0; i < mac->mta_reg_count; i++)
                 REG_PATTERN_TEST_ARRAY(E1000_MTA, i, 0xFFFFFFFF, 0xFFFFFFFF);
 
         *data = 0;
+
         return 0;
 }