[SRU][F][PATCH 1/1] mt76: fix fix ampdu locking

[Shrirang Bagul]

From: Markus Theil <markus.theil at tu-ilmenau.de>

BugLink: https://bugs.launchpad.net/bugs/1906770

The current ampdu locking code does not unlock its mutex in the early
return case. This patch fixes it.

Signed-off-by: Markus Theil <markus.theil at tu-ilmenau.de>
Acked-by: Felix Fietkau <nbd at nbd.name>
Signed-off-by: Kalle Valo <kvalo at codeaurora.org>
(cherry picked from commit 05d6c8cfdbd6cefac6b373bad72775fcc4193c80)
Signed-off-by: Shrirang Bagul <shrirang.bagul at canonical.com>
---
 drivers/net/wireless/mediatek/mt76/mt7603/main.c  | 6 ++++--
 drivers/net/wireless/mediatek/mt76/mt7615/main.c  | 6 ++++--
 drivers/net/wireless/mediatek/mt76/mt76x02_util.c | 6 ++++--
 3 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7603/main.c b/drivers/net/wireless/mediatek/mt76/mt7603/main.c
index cdd5f7d2e866..112014436716 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7603/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7603/main.c
@@ -555,6 +555,7 @@ mt7603_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	u16 ssn = params->ssn;
 	u8 ba_size = params->buf_size;
 	struct mt76_txq *mtxq;
+	int ret = 0;
 
 	if (!txq)
 		return -EINVAL;
@@ -583,7 +584,8 @@ mt7603_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 		break;
 	case IEEE80211_AMPDU_TX_START:
 		mtxq->agg_ssn = IEEE80211_SN_TO_SEQ(ssn);
-		return IEEE80211_AMPDU_TX_START_IMMEDIATE;
+		ret = IEEE80211_AMPDU_TX_START_IMMEDIATE;
+		break;
 	case IEEE80211_AMPDU_TX_STOP_CONT:
 		mtxq->aggr = false;
 		mt7603_mac_tx_ba_reset(dev, msta->wcid.idx, tid, -1);
@@ -592,7 +594,7 @@ mt7603_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	}
 	mutex_unlock(&dev->mt76.mutex);
 
-	return 0;
+	return ret;
 }
 
 static void
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/main.c b/drivers/net/wireless/mediatek/mt76/mt7615/main.c
index 760a22701ab9..9a9a5a8e5751 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/main.c
@@ -449,6 +449,7 @@ mt7615_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	u16 tid = params->tid;
 	u16 ssn = params->ssn;
 	struct mt76_txq *mtxq;
+	int ret = 0;
 
 	if (!txq)
 		return -EINVAL;
@@ -478,7 +479,8 @@ mt7615_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 		break;
 	case IEEE80211_AMPDU_TX_START:
 		mtxq->agg_ssn = IEEE80211_SN_TO_SEQ(ssn);
-		return IEEE80211_AMPDU_TX_START_IMMEDIATE;
+		ret = IEEE80211_AMPDU_TX_START_IMMEDIATE;
+		break;
 	case IEEE80211_AMPDU_TX_STOP_CONT:
 		mtxq->aggr = false;
 		mt7615_mcu_set_tx_ba(dev, params, 0);
@@ -487,7 +489,7 @@ mt7615_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	}
 	mutex_unlock(&dev->mt76.mutex);
 
-	return 0;
+	return ret;
 }
 
 const struct ieee80211_ops mt7615_ops = {
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_util.c b/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
index 165187bbb8be..d10e15a147bb 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
@@ -365,6 +365,7 @@ int mt76x02_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	u16 tid = params->tid;
 	u16 ssn = params->ssn;
 	struct mt76_txq *mtxq;
+	int ret = 0;
 
 	if (!txq)
 		return -EINVAL;
@@ -394,7 +395,8 @@ int mt76x02_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 		break;
 	case IEEE80211_AMPDU_TX_START:
 		mtxq->agg_ssn = IEEE80211_SN_TO_SEQ(ssn);
-		return IEEE80211_AMPDU_TX_START_IMMEDIATE;
+		ret = IEEE80211_AMPDU_TX_START_IMMEDIATE;
+		break;
 	case IEEE80211_AMPDU_TX_STOP_CONT:
 		mtxq->aggr = false;
 		ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
@@ -402,7 +404,7 @@ int mt76x02_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	}
 	mutex_unlock(&dev->mt76.mutex);
 
-	return 0;
+	return ret;
 }
 EXPORT_SYMBOL_GPL(mt76x02_ampdu_action);
 
-- 
2.25.1