[PATCH AUTOSEL 6.18] wifi: rtw89: mlo: rearrange MLSR link decision flow

[Sasha Levin]

From: Kuan-Chung Chen <damon.chen@xxxxxxxxxxx>

[ Upstream commit 7284f5be5d298c901be1fc9fda6a2476f5ffdbaf ]

The original MLSR link decision refers to RSSI, but it should be
based on the premise of an existing link. Otherwise, make a link
decision to select a new link from any available band.

Signed-off-by: Kuan-Chung Chen <damon.chen@xxxxxxxxxxx>
Signed-off-by: Ping-Ke Shih <pkshih@xxxxxxxxxxx>
Link: https://patch.msgid.link/20260429132625.1659182-2-pkshih@xxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---

LLM Generated explanations, may be completely bogus:

Two background git history lookups were interrupted (one had used `git
log --all`, which is too slow in this repo).

The follow-up without `--all` completed: `rtw89_core_mlo_track` first
appears in this 6.18.43 tree at `5d324e5159d9e` (v6.18-rc8 era), so the
MLSR code the patch fixes is present here. That matches the earlier
analysis — **YES** for backport.

 drivers/net/wireless/realtek/rtw89/core.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw89/core.c b/drivers/net/wireless/realtek/rtw89/core.c
index 989c6b09b2706..c2bf839fd82a9 100644
--- a/drivers/net/wireless/realtek/rtw89/core.c
+++ b/drivers/net/wireless/realtek/rtw89/core.c
@@ -4276,13 +4276,19 @@ static void rtw89_core_mlsr_link_decision(struct rtw89_dev *rtwdev,
 {
 	unsigned int sel_link_id = IEEE80211_MLD_MAX_NUM_LINKS;
 	struct ieee80211_vif *vif = rtwvif_to_vif(rtwvif);
+	u8 decided_bands = BIT(RTW89_BAND_NUM) - 1;
 	struct rtw89_vif_link *rtwvif_link;
 	const struct rtw89_chan *chan;
 	unsigned long usable_links;
 	unsigned int link_id;
-	u8 decided_bands;
 	u8 rssi;
 
+	usable_links = ieee80211_vif_usable_links(vif);
+
+	rtwvif_link = rtw89_get_designated_link(rtwvif);
+	if (unlikely(!rtwvif_link))
+		goto select;
+
 	rssi = ewma_rssi_read(&rtwdev->phystat.bcn_rssi);
 	if (unlikely(!rssi))
 		return;
@@ -4294,12 +4300,6 @@ static void rtw89_core_mlsr_link_decision(struct rtw89_dev *rtwdev,
 	else
 		return;
 
-	usable_links = ieee80211_vif_usable_links(vif);
-
-	rtwvif_link = rtw89_get_designated_link(rtwvif);
-	if (unlikely(!rtwvif_link))
-		goto select;
-
 	chan = rtw89_chan_get(rtwdev, rtwvif_link->chanctx_idx);
 	if (decided_bands & BIT(chan->band_type))
 		return;
-- 
2.53.0