net: mvneta: fix trivial cut-off issue in mvneta_ethtool_update_stats

When s->type is T_REG_64, the high 32bits are lost in val. This patch
fixes this trivial issue.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Fixes: 9b0cdefa4cd5 ("net: mvneta: add ethtool statistics")
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index fabc8df..4a8ed5b 100644 (file)
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -3242,26 +3242,25 @@ static void mvneta_ethtool_update_stats(struct mvneta_port *pp)
        const struct mvneta_statistic *s;
        void __iomem *base = pp->base;
        u32 high, low, val;
+       u64 val64;
        int i;
 
        for (i = 0, s = mvneta_statistics;
             s < mvneta_statistics + ARRAY_SIZE(mvneta_statistics);
             s++, i++) {
-               val = 0;
-
                switch (s->type) {
                case T_REG_32:
                        val = readl_relaxed(base + s->offset);
+                       pp->ethtool_stats[i] += val;
                        break;
                case T_REG_64:
                        /* Docs say to read low 32-bit then high */
                        low = readl_relaxed(base + s->offset);
                        high = readl_relaxed(base + s->offset + 4);
-                       val = (u64)high << 32 | low;
+                       val64 = (u64)high << 32 | low;
+                       pp->ethtool_stats[i] += val64;
                        break;
                }
-
-               pp->ethtool_stats[i] += val;
        }
 }