net/mlx5e: Fix incompatible casting

[ Upstream commit d8ec92005f806dfa7524e9171eca707c0bb1267e ]

Device supports setting of a single fec mode at a time, enforce this
by bitmap_weight == 1. Input from fec command is in u32, avoid cast to
unsigned long and use bitmap_from_arr32 to populate bitmap safely.

Fixes: 4bd9d5070b92 ("net/mlx5e: Enforce setting of a single FEC mode")
Signed-off-by: Aya Levin <ayal@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
index 986f0d8..bc7c196 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
@@ -1618,12 +1618,13 @@ static int mlx5e_set_fecparam(struct net_device *netdev,
 {
        struct mlx5e_priv *priv = netdev_priv(netdev);
        struct mlx5_core_dev *mdev = priv->mdev;
+       unsigned long fec_bitmap;
        u16 fec_policy = 0;
        int mode;
        int err;
 
-       if (bitmap_weight((unsigned long *)&fecparam->fec,
-                         ETHTOOL_FEC_LLRS_BIT + 1) > 1)
+       bitmap_from_arr32(&fec_bitmap, &fecparam->fec, sizeof(fecparam->fec) * BITS_PER_BYTE);
+       if (bitmap_weight(&fec_bitmap, ETHTOOL_FEC_LLRS_BIT + 1) > 1)
                return -EOPNOTSUPP;
 
        for (mode = 0; mode < ARRAY_SIZE(pplm_fec_2_ethtool); mode++) {