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Wed, 31 Dec 2025 22:25:44 -0800 (PST) From: Zac Bowling To: linux-wireless@vger.kernel.org Cc: linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, kvalo@kernel.org, lorenzo@kernel.org, nbd@nbd.name, sean.wang@mediatek.com, deren.wu@mediatek.com, ryder.lee@mediatek.com Subject: [PATCH] wifi: mt76: mt7925: add lockdep assertions for mutex verification Date: Wed, 31 Dec 2025 22:25:43 -0800 Message-ID: <20260101062543.186499-1-zbowling@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Zac Bowling 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 --- 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, }, }; =20 + lockdep_assert_held(&dev->mt76.mutex); + if (link_conf->vif->type !=3D NL80211_IFTYPE_STATION) return -EOPNOTSUPP; =20 @@ -2037,6 +2039,8 @@ int mt7925_mcu_sta_update(struct mt792x_dev *dev, struct mt792x_sta *msta; struct mt792x_link_sta *mlink; =20 + lockdep_assert_held(&dev->mt76.mutex); + if (link_sta) { msta =3D (struct mt792x_sta *)link_sta->sta->drv_priv; mlink =3D 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; =20 + lockdep_assert_held(&dev->mt76.mutex); + skb =3D __mt7925_mcu_alloc_bss_req(&dev->mt76, &mconf->mt76, MT7925_BSS_UPDATE_MAX_SIZE); if (IS_ERR(skb)) --=20 2.51.0