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Fri, 02 Jan 2026 12:03:23 -0800 (PST) From: Zac Bowling To: zbowling@gmail.com Cc: deren.wu@mediatek.com, kvalo@kernel.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-wireless@vger.kernel.org, lorenzo@kernel.org, nbd@nbd.name, ryder.lee@mediatek.com, sean.wang@mediatek.com Subject: [PATCH] wifi: mt76: mt7925: add NULL checks and error handling for MCU calls Date: Fri, 2 Jan 2026 12:03:15 -0800 Message-ID: <20260102200315.290015-7-zbowling@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260102200315.290015-1-zbowling@gmail.com> References: <20260101062543.186499-1-zbowling@gmail.com> <20260102200315.290015-1-zbowling@gmail.com> 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 NULL pointer checks for mt792x_sta_to_link() and mt792x_vif_to_link() results in critical paths to prevent kernel crashes during MLO operations. Add error logging for MCU return values in mt7925_regd_update() to help diagnose regulatory domain update failures. Found by static analysis review. --- drivers/net/wireless/mediatek/mt76/mt7925/init.c | 13 ++++++++++--- drivers/net/wireless/mediatek/mt76/mt7925/main.c | 8 ++++++++ 2 files changed, 18 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/init.c b/drivers/net= /wireless/mediatek/mt76/mt7925/init.c index d7d5afe365ed..f800112ccaf7 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7925/init.c +++ b/drivers/net/wireless/mediatek/mt76/mt7925/init.c @@ -162,10 +162,17 @@ void mt7925_regd_update(struct mt792x_dev *dev) if (!dev->regd_change) return; =20 - mt7925_mcu_set_clc(dev, mdev->alpha2, dev->country_ie_env); + if (mt7925_mcu_set_clc(dev, mdev->alpha2, dev->country_ie_env) < 0) + dev_warn(dev->mt76.dev, "Failed to set CLC\n"); + mt7925_regd_channel_update(wiphy, dev); - mt7925_mcu_set_channel_domain(hw->priv); - mt7925_set_tx_sar_pwr(hw, NULL); + + if (mt7925_mcu_set_channel_domain(hw->priv) < 0) + dev_warn(dev->mt76.dev, "Failed to set channel domain\n"); + + if (mt7925_set_tx_sar_pwr(hw, NULL) < 0) + dev_warn(dev->mt76.dev, "Failed to set TX SAR power\n"); + dev->regd_change =3D false; } EXPORT_SYMBOL_GPL(mt7925_regd_update); diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/main.c b/drivers/net= /wireless/mediatek/mt76/mt7925/main.c index 11c0197c7426..b6e3002faf41 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7925/main.c +++ b/drivers/net/wireless/mediatek/mt76/mt7925/main.c @@ -863,12 +863,17 @@ static int mt7925_mac_link_sta_add(struct mt76_dev *m= dev, =20 msta =3D (struct mt792x_sta *)link_sta->sta->drv_priv; mlink =3D mt792x_sta_to_link(msta, link_id); + if (!mlink) + return -EINVAL; =20 idx =3D mt76_wcid_alloc(dev->mt76.wcid_mask, MT792x_WTBL_STA - 1); if (idx < 0) return -ENOSPC; =20 mconf =3D mt792x_vif_to_link(mvif, link_id); + if (!mconf) + return -EINVAL; + mt76_wcid_init(&mlink->wcid, 0); mlink->wcid.sta =3D 1; mlink->wcid.idx =3D idx; @@ -1750,6 +1755,9 @@ mt7925_conf_tx(struct ieee80211_hw *hw, struct ieee80= 211_vif *vif, [IEEE80211_AC_BK] =3D 1, }; =20 + if (!mconf) + return -EINVAL; + /* firmware uses access class index */ mconf->queue_params[mq_to_aci[queue]] =3D *params; =20 --=20 2.51.0