[PATCH net-next] r8169: set tc_offset only if tally counter reset isn't supported

[Heiner Kallweit]

On chip versions supporting tally counter reset we currently update
the counters after a reset although we know all counters are zero.
Skip this unnecessary step.

Signed-off-by: Heiner Kallweit <hkallwe...@gmail.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 25 ++++++++---------------
 1 file changed, 9 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c 
b/drivers/net/ethernet/realtek/r8169_main.c
index 32a4c8c0b..3ef1b31c9 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -1562,16 +1562,6 @@ static void rtl8169_do_counters(struct rtl8169_private 
*tp, u32 counter_cmd)
        rtl_loop_wait_low(tp, &rtl_counters_cond, 10, 1000);
 }
 
-static void rtl8169_reset_counters(struct rtl8169_private *tp)
-{
-       /*
-        * Versions prior to RTL_GIGA_MAC_VER_19 don't support resetting the
-        * tally counters.
-        */
-       if (tp->mac_version >= RTL_GIGA_MAC_VER_19)
-               rtl8169_do_counters(tp, CounterReset);
-}
-
 static void rtl8169_update_counters(struct rtl8169_private *tp)
 {
        u8 val = RTL_R8(tp, ChipCmd);
@@ -1606,13 +1596,16 @@ static void rtl8169_init_counter_offsets(struct 
rtl8169_private *tp)
        if (tp->tc_offset.inited)
                return;
 
-       rtl8169_reset_counters(tp);
-       rtl8169_update_counters(tp);
+       if (tp->mac_version >= RTL_GIGA_MAC_VER_19) {
+               rtl8169_do_counters(tp, CounterReset);
+       } else {
+               rtl8169_update_counters(tp);
+               tp->tc_offset.tx_errors = counters->tx_errors;
+               tp->tc_offset.tx_multi_collision = counters->tx_multi_collision;
+               tp->tc_offset.tx_aborted = counters->tx_aborted;
+               tp->tc_offset.rx_missed = counters->rx_missed;
+       }
 
-       tp->tc_offset.tx_errors = counters->tx_errors;
-       tp->tc_offset.tx_multi_collision = counters->tx_multi_collision;
-       tp->tc_offset.tx_aborted = counters->tx_aborted;
-       tp->tc_offset.rx_missed = counters->rx_missed;
        tp->tc_offset.inited = true;
 }
 
-- 
2.29.2