1 files changed, 39 insertions, 27 deletions

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 02f443958f31..7017281ba2dc 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -4303,6 +4303,42 @@ void e1000e_reinit_locked(struct e1000_adapter *adapter)
 }
 
 /**
+ * e1000e_sanitize_systim - sanitize raw cycle counter reads
+ * @hw: pointer to the HW structure
+ * @systim: cycle_t value read, sanitized and returned
+ *
+ * Errata for 82574/82583 possible bad bits read from SYSTIMH/L:
+ * check to see that the time is incrementing at a reasonable
+ * rate and is a multiple of incvalue.
+ **/
+static cycle_t e1000e_sanitize_systim(struct e1000_hw *hw, cycle_t systim)
+{
+        u64 time_delta, rem, temp;
+        cycle_t systim_next;
+        u32 incvalue;
+        int i;
+
+        incvalue = er32(TIMINCA) & E1000_TIMINCA_INCVALUE_MASK;
+        for (i = 0; i < E1000_MAX_82574_SYSTIM_REREADS; i++) {
+                /* latch SYSTIMH on read of SYSTIML */
+                systim_next = (cycle_t)er32(SYSTIML);
+                systim_next |= (cycle_t)er32(SYSTIMH) << 32;
+
+                time_delta = systim_next - systim;
+                temp = time_delta;
+                /* VMWare users have seen incvalue of zero, don't div / 0 */
+                rem = incvalue ? do_div(temp, incvalue) : (time_delta != 0);
+
+                systim = systim_next;
+
+                if ((time_delta < E1000_82574_SYSTIM_EPSILON) && (rem == 0))
+                        break;
+        }
+
+        return systim;
+}
+
+/**
  * e1000e_cyclecounter_read - read raw cycle counter (used by time counter)
  * @cc: cyclecounter structure
  **/
@@ -4312,7 +4348,7 @@ static cycle_t e1000e_cyclecounter_read(const struct cyclecounter *cc)
                                                      cc);
         struct e1000_hw *hw = &adapter->hw;
         u32 systimel, systimeh;
-        cycle_t systim, systim_next;
+        cycle_t systim;
         /* SYSTIMH latching upon SYSTIML read does not work well.
          * This means that if SYSTIML overflows after we read it but before
          * we read SYSTIMH, the value of SYSTIMH has been incremented and we
@@ -4335,33 +4371,9 @@ static cycle_t e1000e_cyclecounter_read(const struct cyclecounter *cc)
         systim = (cycle_t)systimel;
         systim |= (cycle_t)systimeh << 32;
 
-        if ((hw->mac.type == e1000_82574) || (hw->mac.type == e1000_82583)) {
-                u64 time_delta, rem, temp;
-                u32 incvalue;
-                int i;
-
-                /* errata for 82574/82583 possible bad bits read from SYSTIMH/L
-                 * check to see that the time is incrementing at a reasonable
-                 * rate and is a multiple of incvalue
-                 */
-                incvalue = er32(TIMINCA) & E1000_TIMINCA_INCVALUE_MASK;
-                for (i = 0; i < E1000_MAX_82574_SYSTIM_REREADS; i++) {
-                        /* latch SYSTIMH on read of SYSTIML */
-                        systim_next = (cycle_t)er32(SYSTIML);
-                        systim_next |= (cycle_t)er32(SYSTIMH) << 32;
-
-                        time_delta = systim_next - systim;
-                        temp = time_delta;
-                        /* VMWare users have seen incvalue of zero, don't div / 0 */
-                        rem = incvalue ? do_div(temp, incvalue) : (time_delta != 0);
-
-                        systim = systim_next;
+        if (adapter->flags2 & FLAG2_CHECK_SYSTIM_OVERFLOW)
+                systim = e1000e_sanitize_systim(hw, systim);
 
-                        if ((time_delta < E1000_82574_SYSTIM_EPSILON) &&
-                            (rem == 0))
-                                break;
-                }
-        }
         return systim;
 }