wifi: rtw89: drop invalid TX rate report of legacy rate

Somehow, firmware could report invalid TX rate, and we consider the
invalid rate as 0 that will make a wrong decision. So, drop invalid
reports, and also suppress the warning message.
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220610072610.27095-9-pkshih@realtek.com

drivers/net/wireless/realtek/rtw89/core.c

@@ -155,18 +155,19 @@ static struct ieee80211_rate rtw89_bitrates[] = {
 	{ .bitrate = 540, .hw_value = 0x0b, },
 };
 
-u16 rtw89_ra_report_to_bitrate(struct rtw89_dev *rtwdev, u8 rpt_rate)
+bool rtw89_ra_report_to_bitrate(struct rtw89_dev *rtwdev, u8 rpt_rate, u16 *bitrate)
 {
 	struct ieee80211_rate rate;
 
 	if (unlikely(rpt_rate >= ARRAY_SIZE(rtw89_bitrates))) {
-		rtw89_info(rtwdev, "invalid rpt rate %d\n", rpt_rate);
-		return 0;
+		rtw89_debug(rtwdev, RTW89_DBG_UNEXP, "invalid rpt rate %d\n", rpt_rate);
+		return false;
 	}
 
 	rate = rtw89_bitrates[rpt_rate];
+	*bitrate = rate.bitrate;
 
-	return rate.bitrate;
+	return true;
 }
 
 static struct ieee80211_supported_band rtw89_sband_2ghz = {

drivers/net/wireless/realtek/rtw89/core.h

@@ -3914,7 +3914,7 @@ int rtw89_core_acquire_sta_ba_entry(struct rtw89_sta *rtwsta, u8 tid, u8 *cam_id
 int rtw89_core_release_sta_ba_entry(struct rtw89_sta *rtwsta, u8 tid, u8 *cam_idx);
 void rtw89_vif_type_mapping(struct ieee80211_vif *vif, bool assoc);
 int rtw89_chip_info_setup(struct rtw89_dev *rtwdev);
-u16 rtw89_ra_report_to_bitrate(struct rtw89_dev *rtwdev, u8 rpt_rate);
+bool rtw89_ra_report_to_bitrate(struct rtw89_dev *rtwdev, u8 rpt_rate, u16 *bitrate);
 int rtw89_regd_init(struct rtw89_dev *rtwdev,
 		    void (*reg_notifier)(struct wiphy *wiphy, struct regulatory_request *request));
 void rtw89_regd_notifier(struct wiphy *wiphy, struct regulatory_request *request);

drivers/net/wireless/realtek/rtw89/phy.c

@@ -1918,21 +1918,29 @@ static void rtw89_phy_c2h_ra_rpt_iter(void *data, struct ieee80211_sta *sta)
 	struct rtw89_ra_report *ra_report = &rtwsta->ra_report;
 	struct sk_buff *c2h = ra_data->c2h;
 	u8 mode, rate, bw, giltf, mac_id;
+	u16 legacy_bitrate;
+	bool valid;
 
 	mac_id = RTW89_GET_PHY_C2H_RA_RPT_MACID(c2h->data);
 	if (mac_id != rtwsta->mac_id)
 		return;
 
-	memset(ra_report, 0, sizeof(*ra_report));
-
 	rate = RTW89_GET_PHY_C2H_RA_RPT_MCSNSS(c2h->data);
 	bw = RTW89_GET_PHY_C2H_RA_RPT_BW(c2h->data);
 	giltf = RTW89_GET_PHY_C2H_RA_RPT_GILTF(c2h->data);
 	mode = RTW89_GET_PHY_C2H_RA_RPT_MD_SEL(c2h->data);
 
+	if (mode == RTW89_RA_RPT_MODE_LEGACY) {
+		valid = rtw89_ra_report_to_bitrate(rtwdev, rate, &legacy_bitrate);
+		if (!valid)
+			return;
+	}
+
+	memset(ra_report, 0, sizeof(*ra_report));
+
 	switch (mode) {
 	case RTW89_RA_RPT_MODE_LEGACY:
-		ra_report->txrate.legacy = rtw89_ra_report_to_bitrate(rtwdev, rate);
+		ra_report->txrate.legacy = legacy_bitrate;
 		break;
 	case RTW89_RA_RPT_MODE_HT:
 		ra_report->txrate.flags |= RATE_INFO_FLAGS_MCS;