[PATCH] wifi: mt76: mt7925: add lockdep assertions for mutex verification

[Zac Bowling <zbowling@gmail.com>]

From: Zac Bowling <zac@zacbowling.com>

Add lockdep_assert_held() calls to critical MCU functions to help catch
mutex violations during development and debugging. This follows the
pattern used in other mt76 drivers (mt7996, mt7915, mt7615).

Functions with new assertions:
- mt7925_mcu_add_bss_info(): Core BSS configuration MCU command
- mt7925_mcu_sta_update(): Station record update MCU command
- mt7925_mcu_uni_bss_ps(): Power save state MCU command

These functions modify firmware state and must be called with the
device mutex held to prevent race conditions.

Signed-off-by: Zac Bowling <zac@zacbowling.com>
---
 drivers/net/wireless/mediatek/mt76/mt7925/mcu.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c
index d61a7fbda745..958ff9da9f01 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c
@@ -1527,6 +1527,8 @@ int mt7925_mcu_uni_bss_ps(struct mt792x_dev *dev,
 		},
 	};
 
+	lockdep_assert_held(&dev->mt76.mutex);
+
 	if (link_conf->vif->type != NL80211_IFTYPE_STATION)
 		return -EOPNOTSUPP;
 
@@ -2037,6 +2039,8 @@ int mt7925_mcu_sta_update(struct mt792x_dev *dev,
 	struct mt792x_sta *msta;
 	struct mt792x_link_sta *mlink;
 
+	lockdep_assert_held(&dev->mt76.mutex);
+
 	if (link_sta) {
 		msta = (struct mt792x_sta *)link_sta->sta->drv_priv;
 		mlink = mt792x_sta_to_link(msta, link_sta->link_id);
@@ -2843,6 +2847,8 @@ int mt7925_mcu_add_bss_info(struct mt792x_phy *phy,
 	struct mt792x_link_sta *mlink_bc;
 	struct sk_buff *skb;
 
+	lockdep_assert_held(&dev->mt76.mutex);
+
 	skb = __mt7925_mcu_alloc_bss_req(&dev->mt76, &mconf->mt76,
 					 MT7925_BSS_UPDATE_MAX_SIZE);
 	if (IS_ERR(skb))
-- 
2.51.0