linux-kernel - [PATCH 5.12 04/11] mt76: mt7921: check mcu returned values in mt7921

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Date:   Fri,  9 Jul 2021 15:21:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lorenzo Bianconi <lorenzo@...nel.org>,
        Felix Fietkau <nbd@....name>, Deren Wu <Deren.Wu@...iatek.com>
Subject: [PATCH 5.12 04/11] mt76: mt7921: check mcu returned values in mt7921_start

From: Lorenzo Bianconi <lorenzo@...nel.org>

commit f92f81d35ac26f8a519866f1b561743fe70e33a5 upstream.

Properly check returned values from mcu utility routines in
mt7921_start.

Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
Signed-off-by: Felix Fietkau <nbd@....name>
Cc: Deren Wu <Deren.Wu@...iatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/mediatek/mt76/mt7921/main.c |   19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
@@ -172,22 +172,31 @@ static int mt7921_start(struct ieee80211
 {
 	struct mt7921_dev *dev = mt7921_hw_dev(hw);
 	struct mt7921_phy *phy = mt7921_hw_phy(hw);
+	int err;
 
 	mt7921_mutex_acquire(dev);
 
-	mt76_connac_mcu_set_mac_enable(&dev->mt76, 0, true, false);
-	mt76_connac_mcu_set_channel_domain(phy->mt76);
+	err = mt76_connac_mcu_set_mac_enable(&dev->mt76, 0, true, false);
+	if (err)
+		goto out;
+
+	err = mt76_connac_mcu_set_channel_domain(phy->mt76);
+	if (err)
+		goto out;
+
+	err = mt7921_mcu_set_chan_info(phy, MCU_EXT_CMD_SET_RX_PATH);
+	if (err)
+		goto out;
 
-	mt7921_mcu_set_chan_info(phy, MCU_EXT_CMD_SET_RX_PATH);
 	mt7921_mac_reset_counters(phy);
 	set_bit(MT76_STATE_RUNNING, &phy->mt76->state);
 
 	ieee80211_queue_delayed_work(hw, &phy->mt76->mac_work,
 				     MT7921_WATCHDOG_TIME);
-
+out:
 	mt7921_mutex_release(dev);
 
-	return 0;
+	return err;
 }
 
 static void mt7921_stop(struct ieee80211_hw *hw)