wifi: cfg80211: annotate iftype_data pointer with sparse

There were are a number of cases in mac80211 and iwlwifi (at
least) that used the sband->iftype_data pointer directly,
instead of using the accessors to find the right array entry
to use.

Make sparse warn when such a thing is done.

To not have a lot of casts, add two helper functions/macros

 - ieee80211_set_sband_iftype_data()
 - for_each_sband_iftype_data()

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

11 files changed, 48 insertions, 58 deletions

diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index c071bf5841af..6ed036b51dba 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -5893,8 +5893,9 @@ static void ath11k_mac_setup_he_cap(struct ath11k *ar,
 					       ar->mac.iftype[NL80211_BAND_2GHZ],
 					       NL80211_BAND_2GHZ);
 		band = &ar->mac.sbands[NL80211_BAND_2GHZ];
-		band->iftype_data = ar->mac.iftype[NL80211_BAND_2GHZ];
-		band->n_iftype_data = count;
+		_ieee80211_set_sband_iftype_data(band,
+						 ar->mac.iftype[NL80211_BAND_2GHZ],
+						 count);
 	}
 
 	if (cap->supported_bands & WMI_HOST_WLAN_5G_CAP) {
@@ -5902,8 +5903,9 @@ static void ath11k_mac_setup_he_cap(struct ath11k *ar,
 					       ar->mac.iftype[NL80211_BAND_5GHZ],
 					       NL80211_BAND_5GHZ);
 		band = &ar->mac.sbands[NL80211_BAND_5GHZ];
-		band->iftype_data = ar->mac.iftype[NL80211_BAND_5GHZ];
-		band->n_iftype_data = count;
+		_ieee80211_set_sband_iftype_data(band,
+						 ar->mac.iftype[NL80211_BAND_5GHZ],
+						 count);
 	}
 
 	if (cap->supported_bands & WMI_HOST_WLAN_5G_CAP &&
@@ -5912,8 +5914,9 @@ static void ath11k_mac_setup_he_cap(struct ath11k *ar,
 					       ar->mac.iftype[NL80211_BAND_6GHZ],
 					       NL80211_BAND_6GHZ);
 		band = &ar->mac.sbands[NL80211_BAND_6GHZ];
-		band->iftype_data = ar->mac.iftype[NL80211_BAND_6GHZ];
-		band->n_iftype_data = count;
+		_ieee80211_set_sband_iftype_data(band,
+						 ar->mac.iftype[NL80211_BAND_6GHZ],
+						 count);
 	}
 }
 
diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index 88346e66bb75..24113709972d 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -4647,8 +4647,8 @@ static void ath12k_mac_setup_sband_iftype_data(struct ath12k *ar,
 							  ar->mac.iftype[band],
 							  band);
 		sband = &ar->mac.sbands[band];
-		sband->iftype_data = ar->mac.iftype[band];
-		sband->n_iftype_data = count;
+		_ieee80211_set_sband_iftype_data(sband, ar->mac.iftype[band],
+						 count);
 	}
 
 	if (cap->supported_bands & WMI_HOST_WLAN_5G_CAP) {
@@ -4657,8 +4657,8 @@ static void ath12k_mac_setup_sband_iftype_data(struct ath12k *ar,
 							  ar->mac.iftype[band],
 							  band);
 		sband = &ar->mac.sbands[band];
-		sband->iftype_data = ar->mac.iftype[band];
-		sband->n_iftype_data = count;
+		_ieee80211_set_sband_iftype_data(sband, ar->mac.iftype[band],
+						 count);
 	}
 
 	if (cap->supported_bands & WMI_HOST_WLAN_5G_CAP &&
@@ -4668,8 +4668,8 @@ static void ath12k_mac_setup_sband_iftype_data(struct ath12k *ar,
 							  ar->mac.iftype[band],
 							  band);
 		sband = &ar->mac.sbands[band];
-		sband->iftype_data = ar->mac.iftype[band];
-		sband->n_iftype_data = count;
+		_ieee80211_set_sband_iftype_data(sband, ar->mac.iftype[band],
+						 count);
 	}
 }
 
diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c b/drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c
index 31176897b746..cff1f97536e3 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c
@@ -1077,8 +1077,8 @@ static void iwl_init_he_hw_capab(struct iwl_trans *trans,
 
 	memcpy(iftype_data, iwl_he_eht_capa, sizeof(iwl_he_eht_capa));
 
-	sband->iftype_data = iftype_data;
-	sband->n_iftype_data = ARRAY_SIZE(iwl_he_eht_capa);
+	_ieee80211_set_sband_iftype_data(sband, iftype_data,
+					 ARRAY_SIZE(iwl_he_eht_capa));
 
 	for (i = 0; i < sband->n_iftype_data; i++)
 		iwl_nvm_fixup_sband_iftd(trans, data, sband, &iftype_data[i],
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/init.c b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
index 35fdf4f98d80..b27d04e02aba 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
@@ -1127,8 +1127,7 @@ void mt7915_set_stream_he_caps(struct mt7915_phy *phy)
 		n = mt7915_init_he_caps(phy, NL80211_BAND_2GHZ, data);
 
 		band = &phy->mt76->sband_2g.sband;
-		band->iftype_data = data;
-		band->n_iftype_data = n;
+		_ieee80211_set_sband_iftype_data(band, data, n);
 	}
 
 	if (phy->mt76->cap.has_5ghz) {
@@ -1136,8 +1135,7 @@ void mt7915_set_stream_he_caps(struct mt7915_phy *phy)
 		n = mt7915_init_he_caps(phy, NL80211_BAND_5GHZ, data);
 
 		band = &phy->mt76->sband_5g.sband;
-		band->iftype_data = data;
-		band->n_iftype_data = n;
+		_ieee80211_set_sband_iftype_data(band, data, n);
 	}
 
 	if (phy->mt76->cap.has_6ghz) {
@@ -1145,8 +1143,7 @@ void mt7915_set_stream_he_caps(struct mt7915_phy *phy)
 		n = mt7915_init_he_caps(phy, NL80211_BAND_6GHZ, data);
 
 		band = &phy->mt76->sband_6g.sband;
-		band->iftype_data = data;
-		band->n_iftype_data = n;
+		_ieee80211_set_sband_iftype_data(band, data, n);
 	}
 }
 
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index 0844d28b3223..62e6da1386aa 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
@@ -196,8 +196,7 @@ void mt7921_set_stream_he_caps(struct mt792x_phy *phy)
 		n = mt7921_init_he_caps(phy, NL80211_BAND_2GHZ, data);
 
 		band = &phy->mt76->sband_2g.sband;
-		band->iftype_data = data;
-		band->n_iftype_data = n;
+		_ieee80211_set_sband_iftype_data(band, data, n);
 	}
 
 	if (phy->mt76->cap.has_5ghz) {
@@ -205,16 +204,14 @@ void mt7921_set_stream_he_caps(struct mt792x_phy *phy)
 		n = mt7921_init_he_caps(phy, NL80211_BAND_5GHZ, data);
 
 		band = &phy->mt76->sband_5g.sband;
-		band->iftype_data = data;
-		band->n_iftype_data = n;
+		_ieee80211_set_sband_iftype_data(band, data, n);
 
 		if (phy->mt76->cap.has_6ghz) {
 			data = phy->iftype[NL80211_BAND_6GHZ];
 			n = mt7921_init_he_caps(phy, NL80211_BAND_6GHZ, data);
 
 			band = &phy->mt76->sband_6g.sband;
-			band->iftype_data = data;
-			band->n_iftype_data = n;
+			_ieee80211_set_sband_iftype_data(band, data, n);
 		}
 	}
 }
diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/init.c b/drivers/net/wireless/mediatek/mt76/mt7996/init.c
index 26e03b28935f..0d6cc214ce10 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/init.c
@@ -827,8 +827,7 @@ __mt7996_set_stream_he_eht_caps(struct mt7996_phy *phy,
 		n++;
 	}
 
-	sband->iftype_data = data;
-	sband->n_iftype_data = n;
+	_ieee80211_set_sband_iftype_data(sband, data, n);
 }
 
 void mt7996_set_stream_he_eht_caps(struct mt7996_phy *phy)
diff --git a/drivers/net/wireless/quantenna/qtnfmac/commands.c b/drivers/net/wireless/quantenna/qtnfmac/commands.c
index 68ae9c7ea95a..9540ad6196d7 100644
--- a/drivers/net/wireless/quantenna/qtnfmac/commands.c
+++ b/drivers/net/wireless/quantenna/qtnfmac/commands.c
@@ -1335,7 +1335,7 @@ static int qtnf_cmd_band_fill_iftype(const u8 *data,
 		return -EINVAL;
 	}
 
-	kfree(band->iftype_data);
+	kfree((__force void *)band->iftype_data);
 	band->iftype_data = NULL;
 	band->n_iftype_data = tlv->n_iftype_data;
 	if (band->n_iftype_data == 0)
@@ -1347,7 +1347,8 @@ static int qtnf_cmd_band_fill_iftype(const u8 *data,
 		band->n_iftype_data = 0;
 		return -ENOMEM;
 	}
-	band->iftype_data = iftype_data;
+
+	_ieee80211_set_sband_iftype_data(band, iftype_data, tlv->n_iftype_data);
 
 	for (i = 0; i < band->n_iftype_data; i++)
 		qtnf_cmd_conv_iftype(iftype_data++, &tlv->iftype_data[i]);
diff --git a/drivers/net/wireless/quantenna/qtnfmac/core.c b/drivers/net/wireless/quantenna/qtnfmac/core.c
index 2a63ffdc4b2c..677bac835330 100644
--- a/drivers/net/wireless/quantenna/qtnfmac/core.c
+++ b/drivers/net/wireless/quantenna/qtnfmac/core.c
@@ -535,7 +535,7 @@ static void qtnf_core_mac_detach(struct qtnf_bus *bus, unsigned int macid)
 		if (!wiphy->bands[band])
 			continue;
 
-		kfree(wiphy->bands[band]->iftype_data);
+		kfree((__force void *)wiphy->bands[band]->iftype_data);
 		wiphy->bands[band]->n_iftype_data = 0;
 
 		kfree(wiphy->bands[band]->channels);
diff --git a/drivers/net/wireless/realtek/rtw89/core.c b/drivers/net/wireless/realtek/rtw89/core.c
index 856f3543eff2..fc686954b3dd 100644
--- a/drivers/net/wireless/realtek/rtw89/core.c
+++ b/drivers/net/wireless/realtek/rtw89/core.c
@@ -3359,8 +3359,7 @@ static void rtw89_init_he_cap(struct rtw89_dev *rtwdev,
 		idx++;
 	}
 
-	sband->iftype_data = iftype_data;
-	sband->n_iftype_data = idx;
+	_ieee80211_set_sband_iftype_data(sband, iftype_data, idx);
 }
 
 static int rtw89_core_set_supported_band(struct rtw89_dev *rtwdev)
@@ -3405,11 +3404,11 @@ err:
 	hw->wiphy->bands[NL80211_BAND_5GHZ] = NULL;
 	hw->wiphy->bands[NL80211_BAND_6GHZ] = NULL;
 	if (sband_2ghz)
-		kfree(sband_2ghz->iftype_data);
+		kfree((__force void *)sband_2ghz->iftype_data);
 	if (sband_5ghz)
-		kfree(sband_5ghz->iftype_data);
+		kfree((__force void *)sband_5ghz->iftype_data);
 	if (sband_6ghz)
-		kfree(sband_6ghz->iftype_data);
+		kfree((__force void *)sband_6ghz->iftype_data);
 	kfree(sband_2ghz);
 	kfree(sband_5ghz);
 	kfree(sband_6ghz);
@@ -3421,11 +3420,11 @@ static void rtw89_core_clr_supported_band(struct rtw89_dev *rtwdev)
 	struct ieee80211_hw *hw = rtwdev->hw;
 
 	if (hw->wiphy->bands[NL80211_BAND_2GHZ])
-		kfree(hw->wiphy->bands[NL80211_BAND_2GHZ]->iftype_data);
+		kfree((__force void *)hw->wiphy->bands[NL80211_BAND_2GHZ]->iftype_data);
 	if (hw->wiphy->bands[NL80211_BAND_5GHZ])
-		kfree(hw->wiphy->bands[NL80211_BAND_5GHZ]->iftype_data);
+		kfree((__force void *)hw->wiphy->bands[NL80211_BAND_5GHZ]->iftype_data);
 	if (hw->wiphy->bands[NL80211_BAND_6GHZ])
-		kfree(hw->wiphy->bands[NL80211_BAND_6GHZ]->iftype_data);
+		kfree((__force void *)hw->wiphy->bands[NL80211_BAND_6GHZ]->iftype_data);
 	kfree(hw->wiphy->bands[NL80211_BAND_2GHZ]);
 	kfree(hw->wiphy->bands[NL80211_BAND_5GHZ]);
 	kfree(hw->wiphy->bands[NL80211_BAND_6GHZ]);
diff --git a/drivers/net/wireless/realtek/rtw89/regd.c b/drivers/net/wireless/realtek/rtw89/regd.c
index 9e2328db1865..c956a8b971c6 100644
--- a/drivers/net/wireless/realtek/rtw89/regd.c
+++ b/drivers/net/wireless/realtek/rtw89/regd.c
@@ -377,7 +377,7 @@ bottom:
 		return;
 
 	wiphy->bands[NL80211_BAND_6GHZ] = NULL;
-	kfree(sband->iftype_data);
+	kfree((__force void *)sband->iftype_data);
 	kfree(sband);
 }
 
diff --git a/drivers/net/wireless/virtual/mac80211_hwsim.c b/drivers/net/wireless/virtual/mac80211_hwsim.c
index f5a0880da3fc..36f2d2388ddd 100644
--- a/drivers/net/wireless/virtual/mac80211_hwsim.c
+++ b/drivers/net/wireless/virtual/mac80211_hwsim.c
@@ -4899,25 +4899,19 @@ static const struct ieee80211_sband_iftype_data sband_capa_6ghz[] = {
 
 static void mac80211_hwsim_sband_capab(struct ieee80211_supported_band *sband)
 {
-	u16 n_iftype_data;
-
-	if (sband->band == NL80211_BAND_2GHZ) {
-		n_iftype_data = ARRAY_SIZE(sband_capa_2ghz);
-		sband->iftype_data =
-			(struct ieee80211_sband_iftype_data *)sband_capa_2ghz;
-	} else if (sband->band == NL80211_BAND_5GHZ) {
-		n_iftype_data = ARRAY_SIZE(sband_capa_5ghz);
-		sband->iftype_data =
-			(struct ieee80211_sband_iftype_data *)sband_capa_5ghz;
-	} else if (sband->band == NL80211_BAND_6GHZ) {
-		n_iftype_data = ARRAY_SIZE(sband_capa_6ghz);
-		sband->iftype_data =
-			(struct ieee80211_sband_iftype_data *)sband_capa_6ghz;
-	} else {
-		return;
+	switch (sband->band) {
+	case NL80211_BAND_2GHZ:
+		ieee80211_set_sband_iftype_data(sband, sband_capa_2ghz);
+		break;
+	case NL80211_BAND_5GHZ:
+		ieee80211_set_sband_iftype_data(sband, sband_capa_5ghz);
+		break;
+	case NL80211_BAND_6GHZ:
+		ieee80211_set_sband_iftype_data(sband, sband_capa_6ghz);
+		break;
+	default:
+		break;
 	}
-
-	sband->n_iftype_data = n_iftype_data;
 }
 
 #ifdef CONFIG_MAC80211_MESH