linux-kernel - [PATCH 5.13 499/800] mt76: mt7921: avoid unnecessary consecutive WiFi resets

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Date:   Mon, 12 Jul 2021 08:08:42 +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>,
        Sean Wang <sean.wang@...iatek.com>,
        Felix Fietkau <nbd@....name>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 499/800] mt76: mt7921: avoid unnecessary consecutive WiFi resets

From: Sean Wang <sean.wang@...iatek.com>

[ Upstream commit f07ac384b4579f294bb1e0380ed501156219ed71 ]

Avoid unnecessary consecutive WiFi resets by dropping reset
request when reset work is working.

Co-developed-by: Lorenzo Bianconi <lorenzo@...nel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
Signed-off-by: Sean Wang <sean.wang@...iatek.com>
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/mediatek/mt76/mt7921/mac.c    | 5 ++++-
 drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
index 9bb88b2e28a9..4eac7c3206f9 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
@@ -1272,6 +1272,7 @@ void mt7921_mac_reset_work(struct work_struct *work)
 	hw = mt76_hw(dev);
 
 	dev_err(dev->mt76.dev, "chip reset\n");
+	dev->hw_full_reset = true;
 	ieee80211_stop_queues(hw);
 
 	cancel_delayed_work_sync(&dev->mphy.mac_work);
@@ -1296,6 +1297,7 @@ void mt7921_mac_reset_work(struct work_struct *work)
 		ieee80211_scan_completed(dev->mphy.hw, &info);
 	}
 
+	dev->hw_full_reset = false;
 	ieee80211_wake_queues(hw);
 	ieee80211_iterate_active_interfaces(hw,
 					    IEEE80211_IFACE_ITER_RESUME_ALL,
@@ -1306,7 +1308,8 @@ void mt7921_reset(struct mt76_dev *mdev)
 {
 	struct mt7921_dev *dev = container_of(mdev, struct mt7921_dev, mt76);
 
-	queue_work(dev->mt76.wq, &dev->reset_work);
+	if (!dev->hw_full_reset)
+		queue_work(dev->mt76.wq, &dev->reset_work);
 }
 
 static void
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
index 59862ea4951c..4cc8a372b277 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
@@ -156,6 +156,7 @@ struct mt7921_dev {
 	u16 chainmask;
 
 	struct work_struct reset_work;
+	bool hw_full_reset;
 
 	struct list_head sta_poll_list;
 	spinlock_t sta_poll_lock;
-- 
2.30.2