staging: wfx: simplify hif_set_association_mode()

The structure hif_mib_set_association_mode come from hardware API. It is
not intended to be manipulated in upper layers of the driver.

In add, current code for hif_set_association_mode() is too dumb. It
should pack data with hardware representation instead of leaving all
work to the caller.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200115135338.14374-31-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/hif_tx_mib.h

@@ -191,10 +191,28 @@ static inline int hif_set_block_ack_policy(struct wfx_vif *wvif,
 }
 
 static inline int hif_set_association_mode(struct wfx_vif *wvif,
-					   struct hif_mib_set_association_mode *arg)
+					   struct ieee80211_bss_conf *info,
+					   struct ieee80211_sta_ht_cap *ht_cap)
 {
+	int basic_rates = wfx_rate_mask_to_hw(wvif->wdev, info->basic_rates);
+	struct hif_mib_set_association_mode val = {
+		.preambtype_use = 1,
+		.mode = 1,
+		.rateset = 1,
+		.spacing = 1,
+		.short_preamble = info->use_short_preamble,
+		.basic_rate_set = cpu_to_le32(basic_rates)
+	};
+
+	// FIXME: it is strange to not retrieve all information from bss_info
+	if (ht_cap && ht_cap->ht_supported) {
+		val.mpdu_start_spacing = ht_cap->ampdu_density;
+		if (!(info->ht_operation_mode & IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT))
+			val.greenfield = !!(ht_cap->cap & IEEE80211_HT_CAP_GRN_FLD);
+	}
+
 	return hif_write_mib(wvif->wdev, wvif->id,
-			     HIF_MIB_ID_SET_ASSOCIATION_MODE, arg, sizeof(*arg));
+			     HIF_MIB_ID_SET_ASSOCIATION_MODE, &val, sizeof(val));
 }
 
 static inline int hif_set_tx_rate_retry_policy(struct wfx_vif *wvif,

drivers/staging/wfx/sta.c

@@ -712,7 +712,6 @@ static void wfx_join_finalize(struct wfx_vif *wvif,
 			      struct ieee80211_bss_conf *info)
 {
 	struct ieee80211_sta *sta = NULL;
-	struct hif_mib_set_association_mode association_mode = { };
 
 	wvif->beacon_int = info->beacon_int;
 	rcu_read_lock();
@@ -730,26 +729,13 @@ static void wfx_join_finalize(struct wfx_vif *wvif,
 	else
 		hif_dual_cts_protection(wvif, false);
 
-	association_mode.preambtype_use = 1;
-	association_mode.mode = 1;
-	association_mode.rateset = 1;
-	association_mode.spacing = 1;
-	association_mode.short_preamble = info->use_short_preamble;
-	association_mode.basic_rate_set = cpu_to_le32(wfx_rate_mask_to_hw(wvif->wdev, info->basic_rates));
-	if (sta && sta->ht_cap.ht_supported &&
-	    !(info->ht_operation_mode & IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT))
-		association_mode.greenfield =
-			!!(sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD);
-	if (sta && sta->ht_cap.ht_supported)
-		association_mode.mpdu_start_spacing = sta->ht_cap.ampdu_density;
-
 	wfx_cqm_bssloss_sm(wvif, 0, 0, 0);
 	cancel_work_sync(&wvif->unjoin_work);
 
 	wvif->bss_params.beacon_lost_count = 20;
 	wvif->bss_params.aid = info->aid;
 
-	hif_set_association_mode(wvif, &association_mode);
+	hif_set_association_mode(wvif, info, sta ? &sta->ht_cap : NULL);
 
 	if (!info->ibss_joined) {
 		hif_keep_alive_period(wvif, 30 /* sec */);