forcedeth: run loopback test only on chipsets that support it

The driver incorrectly run loopback test on chips that don't support it.
Loopback test is only supported by chips that has DEV_HAS_TEST_EXTENDED
flag and returns 4 (NV_TEST_COUNT_EXTENDED) as test count.

Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/nvidia/forcedeth.c b/drivers/net/ethernet/nvidia/forcedeth.c
index 2d045be..1e8b951 100644 (file)
--- a/drivers/net/ethernet/nvidia/forcedeth.c
+++ b/drivers/net/ethernet/nvidia/forcedeth.c
@@ -5150,8 +5150,10 @@ static void nv_self_test(struct net_device *dev, struct ethtool_test *test, u64
 {
        struct fe_priv *np = netdev_priv(dev);
        u8 __iomem *base = get_hwbase(dev);
-       int result;
-       memset(buffer, 0, nv_get_sset_count(dev, ETH_SS_TEST)*sizeof(u64));
+       int result, count;
+
+       count = nv_get_sset_count(dev, ETH_SS_TEST);
+       memset(buffer, 0, count * sizeof(u64));
 
        if (!nv_link_test(dev)) {
                test->flags |= ETH_TEST_FL_FAILED;
@@ -5195,7 +5197,7 @@ static void nv_self_test(struct net_device *dev, struct ethtool_test *test, u64
                        return;
                }
 
-               if (!nv_loopback_test(dev)) {
+               if (count > NV_TEST_COUNT_BASE && !nv_loopback_test(dev)) {
                        test->flags |= ETH_TEST_FL_FAILED;
                        buffer[3] = 1;
                }