[RFC net-next v2 13/14] net: stmmac: dwmac1000: Clear unused address entries

[Jose Abreu]

In case we don't use a given address entry we need to clear it because
it could contain previous values that are no longer valid.

Found out while running stmmac selftests.

Signed-off-by: Jose Abreu <joab...@synopsys.com>
Cc: Joao Pinto <jpi...@synopsys.com>
Cc: David S. Miller <da...@davemloft.net>
Cc: Giuseppe Cavallaro <peppe.cavall...@st.com>
Cc: Alexandre Torgue <alexandre.tor...@st.com>
Cc: Corentin Labbe <clabbe.montj...@gmail.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c 
b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c
index bc91af6c01b6..ebe41dd09bab 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c
@@ -217,6 +217,12 @@ static void dwmac1000_set_filter(struct mac_device_info 
*hw,
                                            GMAC_ADDR_LOW(reg));
                        reg++;
                }
+
+               while (reg <= perfect_addr_number) {
+                       writel(0, ioaddr + GMAC_ADDR_HIGH(reg));
+                       writel(0, ioaddr + GMAC_ADDR_LOW(reg));
+                       reg++;
+               }
        }
 
 #ifdef FRAME_FILTER_DEBUG
-- 
2.7.4