[PATCH] wifi: mac80211: make rate u32 in sta_set_rate_info_rx()

[AngeloGioacchino Del Regno]

Il 09/02/23 12:06, Shayne Chen ha scritto:
> The value of last_rate in ieee80211_sta_rx_stats is degraded from u32 to
> u16 after being assigned to rate variable, which causes information loss
> in STA_STATS_FIELD_TYPE and later bitfields.
> 
> Signed-off-by: Shayne Chen <shayne.chen at mediatek.com>

In struct ieee80211_sta_rx_stats, `last_rate` is u32, hence this local `rate`
must be u32, or information loss may happen. Agreed.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>

> ---
>   net/mac80211/sta_info.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
> index 27c737fe7fb8..bd532d3f925d 100644
> --- a/net/mac80211/sta_info.c
> +++ b/net/mac80211/sta_info.c
> @@ -2418,7 +2418,7 @@ static void sta_stats_decode_rate(struct ieee80211_local *local, u32 rate,
>   
>   static int sta_set_rate_info_rx(struct sta_info *sta, struct rate_info *rinfo)
>   {
> -	u16 rate = READ_ONCE(sta_get_last_rx_stats(sta)->last_rate);
> +	u32 rate = READ_ONCE(sta_get_last_rx_stats(sta)->last_rate);
>   
>   	if (rate == STA_STATS_RATE_INVALID)
>   		return -EINVAL;
>