r8169: don't try to read counters if chip is in a PCI power-save state

Avoid log spam caused by trying to read counters from the chip whilst
it is in a PCI power-save state.

Reference: https://bugzilla.kernel.org/show_bug.cgi?id=107421

Fixes: 1ef7286e7f36 ("r8169: Dereference MMIO address immediately before use")
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 7fe9180..784ae50 100644 (file)
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -1681,11 +1681,13 @@ static bool rtl8169_reset_counters(struct rtl8169_private *tp)
 
 static bool rtl8169_update_counters(struct rtl8169_private *tp)
 {
+       u8 val = RTL_R8(tp, ChipCmd);
+
        /*
         * Some chips are unable to dump tally counters when the receiver
-        * is disabled.
+        * is disabled. If 0xff chip may be in a PCI power-save state.
         */
-       if ((RTL_R8(tp, ChipCmd) & CmdRxEnb) == 0)
+       if (!(val & CmdRxEnb) || val == 0xff)
                return true;
 
        return rtl8169_do_counters(tp, CounterDump);