wifi: ath12k: Introduce and use ath12k_sta_to_arsta()

Currently, the logic to return an ath12k_sta pointer, given a
ieee80211_sta pointer, uses typecasting throughout the driver. In
general, conversion functions are preferable to typecasting since
using a conversion function allows the compiler to validate the types
of both the input and output parameters.

ath12k already defines a conversion function ath12k_vif_to_arvif() for
a similar conversion. So introduce ath12k_sta_to_arsta() for this use
case, and convert all of the existing typecasting to use this
function.

Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20231019-upstream-ath12k_sta_to_arsta-v1-1-06f06f693338@quicinc.com

drivers/net/wireless/ath/ath12k/core.h

@@ -852,6 +852,11 @@ static inline struct ath12k_vif *ath12k_vif_to_arvif(struct ieee80211_vif *vif)
 	return (struct ath12k_vif *)vif->drv_priv;
 }
 
+static inline struct ath12k_sta *ath12k_sta_to_arsta(struct ieee80211_sta *sta)
+{
+	return (struct ath12k_sta *)sta->drv_priv;
+}
+
 static inline struct ath12k *ath12k_ab_to_ar(struct ath12k_base *ab,
 					     int mac_id)
 {

drivers/net/wireless/ath/ath12k/dp_mon.c

@@ -2374,7 +2374,7 @@ ath12k_dp_mon_rx_update_user_stats(struct ath12k *ar,
 		return;
 	}
 
-	arsta = (struct ath12k_sta *)peer->sta->drv_priv;
+	arsta = ath12k_sta_to_arsta(peer->sta);
 	rx_stats = arsta->rx_stats;
 
 	if (!rx_stats)
@@ -2550,7 +2550,7 @@ int ath12k_dp_mon_rx_process_stats(struct ath12k *ar, int mac_id,
 			}
 
 			if (ppdu_info->reception_type == HAL_RX_RECEPTION_TYPE_SU) {
-				arsta = (struct ath12k_sta *)peer->sta->drv_priv;
+				arsta = ath12k_sta_to_arsta(peer->sta);
 				ath12k_dp_mon_rx_update_peer_su_stats(ar, arsta,
 								      ppdu_info);
 			} else if ((ppdu_info->fc_valid) &&

drivers/net/wireless/ath/ath12k/dp_rx.c

@@ -1054,7 +1054,7 @@ int ath12k_dp_rx_ampdu_start(struct ath12k *ar,
 			     struct ieee80211_ampdu_params *params)
 {
 	struct ath12k_base *ab = ar->ab;
-	struct ath12k_sta *arsta = (void *)params->sta->drv_priv;
+	struct ath12k_sta *arsta = ath12k_sta_to_arsta(params->sta);
 	int vdev_id = arsta->arvif->vdev_id;
 	int ret;
 
@@ -1072,7 +1072,7 @@ int ath12k_dp_rx_ampdu_stop(struct ath12k *ar,
 {
 	struct ath12k_base *ab = ar->ab;
 	struct ath12k_peer *peer;
-	struct ath12k_sta *arsta = (void *)params->sta->drv_priv;
+	struct ath12k_sta *arsta = ath12k_sta_to_arsta(params->sta);
 	int vdev_id = arsta->arvif->vdev_id;
 	bool active;
 	int ret;
@@ -1410,7 +1410,7 @@ ath12k_update_per_peer_tx_stats(struct ath12k *ar,
 	}
 
 	sta = peer->sta;
-	arsta = (struct ath12k_sta *)sta->drv_priv;
+	arsta = ath12k_sta_to_arsta(sta);
 
 	memset(&arsta->txrate, 0, sizeof(arsta->txrate));
 

drivers/net/wireless/ath/ath12k/mac.c

@@ -3247,7 +3247,7 @@ static int ath12k_mac_op_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 		ath12k_warn(ab, "peer %pM disappeared!\n", peer_addr);
 
 	if (sta) {
-		arsta = (struct ath12k_sta *)sta->drv_priv;
+		arsta = ath12k_sta_to_arsta(sta);
 
 		switch (key->cipher) {
 		case WLAN_CIPHER_SUITE_TKIP:
@@ -3637,7 +3637,7 @@ static int ath12k_mac_station_add(struct ath12k *ar,
 {
 	struct ath12k_base *ab = ar->ab;
 	struct ath12k_vif *arvif = ath12k_vif_to_arvif(vif);
-	struct ath12k_sta *arsta = (struct ath12k_sta *)sta->drv_priv;
+	struct ath12k_sta *arsta = ath12k_sta_to_arsta(sta);
 	struct ath12k_wmi_peer_create_arg peer_param;
 	int ret;
 
@@ -3744,7 +3744,7 @@ static int ath12k_mac_op_sta_state(struct ieee80211_hw *hw,
 {
 	struct ath12k *ar = hw->priv;
 	struct ath12k_vif *arvif = ath12k_vif_to_arvif(vif);
-	struct ath12k_sta *arsta = (struct ath12k_sta *)sta->drv_priv;
+	struct ath12k_sta *arsta = ath12k_sta_to_arsta(sta);
 	struct ath12k_peer *peer;
 	int ret = 0;
 
@@ -3892,7 +3892,7 @@ static void ath12k_mac_op_sta_rc_update(struct ieee80211_hw *hw,
 					u32 changed)
 {
 	struct ath12k *ar = hw->priv;
-	struct ath12k_sta *arsta = (struct ath12k_sta *)sta->drv_priv;
+	struct ath12k_sta *arsta = ath12k_sta_to_arsta(sta);
 	struct ath12k_vif *arvif = ath12k_vif_to_arvif(vif);
 	struct ath12k_peer *peer;
 	u32 bw, smps;
@@ -6762,7 +6762,7 @@ static void ath12k_mac_set_bitrate_mask_iter(void *data,
 					     struct ieee80211_sta *sta)
 {
 	struct ath12k_vif *arvif = data;
-	struct ath12k_sta *arsta = (struct ath12k_sta *)sta->drv_priv;
+	struct ath12k_sta *arsta = ath12k_sta_to_arsta(sta);
 	struct ath12k *ar = arvif->ar;
 
 	spin_lock_bh(&ar->data_lock);
@@ -7051,7 +7051,7 @@ static void ath12k_mac_op_sta_statistics(struct ieee80211_hw *hw,
 					 struct ieee80211_sta *sta,
 					 struct station_info *sinfo)
 {
-	struct ath12k_sta *arsta = (struct ath12k_sta *)sta->drv_priv;
+	struct ath12k_sta *arsta = ath12k_sta_to_arsta(sta);
 
 	sinfo->rx_duration = arsta->rx_duration;
 	sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_DURATION);