On 29/03/2021 08:13, Ido Schimmel wrote:
> On Sat, Mar 27, 2021 at 10:33:34PM +0000, Colin King wrote:
>> From: Colin Ian King <colin.k...@canonical.com>
>>
>> The variable force is being initialized with a value that is
>> never read and it is being updated later with a new value. The
>> initialization is redundant and can be removed.
>>
>> Addresses-Coverity: ("Unused value")
>> Signed-off-by: Colin Ian King <colin.k...@canonical.com>
>> ---
>> drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
>> b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
>> index 6ccaa194733b..ff240e3c29f7 100644
>> --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
>> +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
>> @@ -5059,7 +5059,7 @@ mlxsw_sp_nexthop_obj_bucket_adj_update(struct mlxsw_sp
>> *mlxsw_sp,
>> {
>> u16 bucket_index = info->nh_res_bucket->bucket_index;
>> struct netlink_ext_ack *extack = info->extack;
>> - bool force = info->nh_res_bucket->force;
>> + bool force;
>
> Actually, there is a bug to be fixed here:
>
> ```
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
> b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
> index 6ccaa194733b..41259c0004d1 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
> @@ -5068,8 +5068,9 @@ mlxsw_sp_nexthop_obj_bucket_adj_update(struct mlxsw_sp
> *mlxsw_sp,
> /* No point in trying an atomic replacement if the idle timer interval
> * is smaller than the interval in which we query and clear activity.
> */
> - force = info->nh_res_bucket->idle_timer_ms <
> - MLXSW_SP_NH_GRP_ACTIVITY_UPDATE_INTERVAL;
> + if (!force && info->nh_res_bucket->idle_timer_ms <
> + MLXSW_SP_NH_GRP_ACTIVITY_UPDATE_INTERVAL)
> + force = true;
>
> adj_index = nh->nhgi->adj_index + bucket_index;
> err = mlxsw_sp_nexthop_update(mlxsw_sp, adj_index, nh, force,
> ratr_pl);
> ```
>
> We should only fallback to a non-atomic replacement when the current
> replacement is atomic and the idle timer is too short.
>
> We currently ignore the value of 'force'. This means that a non-atomic
> replacement ('force' is true) can be made atomic if idle timer is larger
> than 1 second.
>
> Colin, do you mind if I submit it formally as a fix later this week? I
> want to run it through our usual process. Will mention you in
> Reported-by, obviously.
Sure. Good idea.
>
>> char ratr_pl_new[MLXSW_REG_RATR_LEN];
>> char ratr_pl[MLXSW_REG_RATR_LEN];
>> u32 adj_index;
>> --
>> 2.30.2
>>
