ipv4: Fix data-races around sysctl_fib_multipath_hash_fields.

[platform/kernel/linux-rpi.git] / drivers / net / ethernet / mellanox / mlxsw / spectrum_router.c

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 0d8a006..85aa1c4 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -10324,7 +10324,7 @@ static void mlxsw_sp_mp4_hash_init(struct mlxsw_sp *mlxsw_sp,
        unsigned long *fields = config->fields;
        u32 hash_fields;
 
-       switch (net->ipv4.sysctl_fib_multipath_hash_policy) {
+       switch (READ_ONCE(net->ipv4.sysctl_fib_multipath_hash_policy)) {
        case 0:
                mlxsw_sp_mp4_hash_outer_addr(config);
                break;
@@ -10342,7 +10342,7 @@ static void mlxsw_sp_mp4_hash_init(struct mlxsw_sp *mlxsw_sp,
                mlxsw_sp_mp_hash_inner_l3(config);
                break;
        case 3:
-               hash_fields = net->ipv4.sysctl_fib_multipath_hash_fields;
+               hash_fields = READ_ONCE(net->ipv4.sysctl_fib_multipath_hash_fields);
                /* Outer */
                MLXSW_SP_MP_HASH_HEADER_SET(headers, IPV4_EN_NOT_TCP_NOT_UDP);
                MLXSW_SP_MP_HASH_HEADER_SET(headers, IPV4_EN_TCP_UDP);
@@ -10523,13 +10523,14 @@ static int mlxsw_sp_dscp_init(struct mlxsw_sp *mlxsw_sp)
 static int __mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp)
 {
        struct net *net = mlxsw_sp_net(mlxsw_sp);
-       bool usp = net->ipv4.sysctl_ip_fwd_update_priority;
        char rgcr_pl[MLXSW_REG_RGCR_LEN];
        u64 max_rifs;
+       bool usp;
 
        if (!MLXSW_CORE_RES_VALID(mlxsw_sp->core, MAX_RIFS))
                return -EIO;
        max_rifs = MLXSW_CORE_RES_GET(mlxsw_sp->core, MAX_RIFS);
+       usp = READ_ONCE(net->ipv4.sysctl_ip_fwd_update_priority);
 
        mlxsw_reg_rgcr_pack(rgcr_pl, true, true);
        mlxsw_reg_rgcr_max_router_interfaces_set(rgcr_pl, max_rifs);