mt76: mt7921: reduce the mutex lock scope during reset

Reduce the mutex lock scope for reset to get rid of possible task hung
e.g wpa_supplicant and to allow the user-space process to keep running
during we need more retries to complete the reset.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Suggested-by: YN Chen <YN.Chen@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

mt7921/mac.c

@@ -738,7 +738,7 @@ void mt7921_mac_reset_work(struct work_struct *work)
 					      reset_work);
 	struct ieee80211_hw *hw = mt76_hw(dev);
 	struct mt76_connac_pm *pm = &dev->pm;
-	int i;
+	int i, ret;
 
 	dev_dbg(dev->mt76.dev, "chip reset\n");
 	dev->hw_full_reset = true;
@@ -748,11 +748,14 @@ void mt7921_mac_reset_work(struct work_struct *work)
 	cancel_delayed_work_sync(&pm->ps_work);
 	cancel_work_sync(&pm->wake_work);
 
-	mutex_lock(&dev->mt76.mutex);
-	for (i = 0; i < 10; i++)
-		if (!mt7921_dev_reset(dev))
+	for (i = 0; i < 10; i++) {
+		mutex_lock(&dev->mt76.mutex);
+		ret = mt7921_dev_reset(dev);
+		mutex_unlock(&dev->mt76.mutex);
+
+		if (!ret)
 			break;
-	mutex_unlock(&dev->mt76.mutex);
+	}
 
 	if (i == 10)
 		dev_err(dev->mt76.dev, "chip reset failed\n");