mac80211: minstrel: make short preamble CCK available when not used at connect time

The BSS short preamble state can change without rate control
update notification.

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/kernel/mac80211/patches/373-mac80211-minstrel-fix-using-short-preamble-CCK-rates.patch

@@ -11,13 +11,21 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
 
 --- a/net/mac80211/rc80211_minstrel_ht.c
 +++ b/net/mac80211/rc80211_minstrel_ht.c
-@@ -1268,7 +1268,8 @@ minstrel_ht_update_caps(void *priv, stru
+@@ -1135,7 +1135,6 @@ minstrel_ht_update_caps(void *priv, stru
+ 	struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs;
+ 	u16 ht_cap = sta->ht_cap.cap;
+ 	struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
+-	struct sta_info *sinfo = container_of(sta, struct sta_info, sta);
+ 	int use_vht;
+ 	int n_supported = 0;
+ 	int ack_dur;
+@@ -1267,8 +1266,7 @@ minstrel_ht_update_caps(void *priv, stru
+ 	if (!n_supported)
  		goto use_legacy;
  
- 	if (test_sta_flag(sinfo, WLAN_STA_SHORT_PREAMBLE))
+-	if (test_sta_flag(sinfo, WLAN_STA_SHORT_PREAMBLE))
 -		mi->cck_supported_short |= mi->cck_supported_short << 4;
-+		mi->supported[MINSTREL_CCK_GROUP] |=
-+			mi->cck_supported_short << 4;
++	mi->supported[MINSTREL_CCK_GROUP] |= mi->cck_supported_short << 4;
  
  	/* create an initial rate table with the lowest supported rates */
  	minstrel_ht_update_stats(mp, mi);