mt76: disable BH around napi_schedule() calls

napi_schedule() can call __raise_softirq_irqoff(), which can perform softirq handling, so it must not be called in a pure process context with BH enabled. Signed-off-by: Felix Fietkau <nbd@nbd.name>
mariux64 · Oct 20, 2021 · 970be1d · 970be1d
1 parent abe3f3d
commit 970be1d
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Showing 9 changed files with 30 additions and 4 deletions.
diff --git a/drivers/net/wireless/mediatek/mt76/mt7603/mac.c b/drivers/net/wireless/mediatek/mt76/mt7603/mac.c
@@ -1471,17 +1471,20 @@ static void mt7603_mac_watchdog_reset(struct mt7603_dev *dev)
 	mutex_unlock(&dev->mt76.mutex);
 
 	mt76_worker_enable(&dev->mt76.tx_worker);
-	napi_enable(&dev->mt76.tx_napi);
-	napi_schedule(&dev->mt76.tx_napi);
 
 	tasklet_enable(&dev->mt76.pre_tbtt_tasklet);
 	mt7603_beacon_set_timer(dev, -1, beacon_int);
 
+	local_bh_disable();
+	napi_enable(&dev->mt76.tx_napi);
+	napi_schedule(&dev->mt76.tx_napi);
+
 	napi_enable(&dev->mt76.napi[0]);
 	napi_schedule(&dev->mt76.napi[0]);
 
 	napi_enable(&dev->mt76.napi[1]);
 	napi_schedule(&dev->mt76.napi[1]);
+	local_bh_enable();
 
 	ieee80211_wake_queues(dev->mt76.hw);
 	mt76_txq_schedule_all(&dev->mphy);

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/pci.c b/drivers/net/wireless/mediatek/mt76/mt7615/pci.c
@@ -164,12 +164,14 @@ static int mt7615_pci_resume(struct pci_dev *pdev)
 		dev_err(mdev->dev, "PDMA engine must be reinitialized\n");
 
 	mt76_worker_enable(&mdev->tx_worker);
+	local_bh_disable();
 	mt76_for_each_q_rx(mdev, i) {
 		napi_enable(&mdev->napi[i]);
 		napi_schedule(&mdev->napi[i]);
 	}
 	napi_enable(&mdev->tx_napi);
 	napi_schedule(&mdev->tx_napi);
+	local_bh_enable();
 
 	if (!test_bit(MT76_STATE_SUSPEND, &dev->mphy.state) &&
 	    mt7615_firmware_offload(dev))

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/pci_mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/pci_mac.c
@@ -326,6 +326,8 @@ void mt7615_mac_reset_work(struct work_struct *work)
 		clear_bit(MT76_RESET, &phy2->mt76->state);
 
 	mt76_worker_enable(&dev->mt76.tx_worker);
+
+	local_bh_disable();
 	napi_enable(&dev->mt76.tx_napi);
 	napi_schedule(&dev->mt76.tx_napi);
 
@@ -334,6 +336,7 @@ void mt7615_mac_reset_work(struct work_struct *work)
 
 	napi_enable(&dev->mt76.napi[1]);
 	napi_schedule(&dev->mt76.napi[1]);
+	local_bh_enable();
 
 	ieee80211_wake_queues(mt76_hw(dev));
 	if (ext_phy)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x0/pci.c b/drivers/net/wireless/mediatek/mt76/mt76x0/pci.c
@@ -276,6 +276,7 @@ static int mt76x0e_resume(struct pci_dev *pdev)
 
 	mt76_worker_enable(&mdev->tx_worker);
 
+	local_bh_disable();
 	mt76_for_each_q_rx(mdev, i) {
 		mt76_queue_rx_reset(dev, i);
 		napi_enable(&mdev->napi[i]);
@@ -284,6 +285,7 @@ static int mt76x0e_resume(struct pci_dev *pdev)
 
 	napi_enable(&mdev->tx_napi);
 	napi_schedule(&mdev->tx_napi);
+	local_bh_enable();
 
 	return mt76x0e_init_hardware(dev, true);
 }

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c b/drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c
@@ -491,15 +491,17 @@ static void mt76x02_watchdog_reset(struct mt76x02_dev *dev)
 	clear_bit(MT76_RESET, &dev->mphy.state);
 
 	mt76_worker_enable(&dev->mt76.tx_worker);
+	tasklet_enable(&dev->mt76.pre_tbtt_tasklet);
+
+	local_bh_disable();
 	napi_enable(&dev->mt76.tx_napi);
 	napi_schedule(&dev->mt76.tx_napi);
 
-	tasklet_enable(&dev->mt76.pre_tbtt_tasklet);
-
 	mt76_for_each_q_rx(&dev->mt76, i) {
 		napi_enable(&dev->mt76.napi[i]);
 		napi_schedule(&dev->mt76.napi[i]);
 	}
+	local_bh_enable();
 
 	if (restart) {
 		set_bit(MT76_RESTART, &dev->mphy.state);

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x2/pci.c b/drivers/net/wireless/mediatek/mt76/mt76x2/pci.c
@@ -149,12 +149,15 @@ mt76x2e_resume(struct pci_dev *pdev)
 	pci_restore_state(pdev);
 
 	mt76_worker_enable(&mdev->tx_worker);
+
+	local_bh_disable();
 	mt76_for_each_q_rx(mdev, i) {
 		napi_enable(&mdev->napi[i]);
 		napi_schedule(&mdev->napi[i]);
 	}
 	napi_enable(&mdev->tx_napi);
 	napi_schedule(&mdev->tx_napi);
+	local_bh_enable();
 
 	return mt76x2_resume_device(dev);
 }

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -1837,6 +1837,7 @@ void mt7915_mac_reset_work(struct work_struct *work)
 	if (phy2)
 		clear_bit(MT76_RESET, &phy2->mt76->state);
 
+	local_bh_disable();
 	napi_enable(&dev->mt76.napi[0]);
 	napi_schedule(&dev->mt76.napi[0]);
 
@@ -1845,6 +1846,8 @@ void mt7915_mac_reset_work(struct work_struct *work)
 
 	napi_enable(&dev->mt76.napi[2]);
 	napi_schedule(&dev->mt76.napi[2]);
+	local_bh_enable();
+
 	tasklet_schedule(&dev->irq_tasklet);
 
 	mt76_wr(dev, MT_MCU_INT_EVENT, MT_MCU_INT_EVENT_RESET_DONE);

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
@@ -1390,10 +1390,12 @@ mt7921_mac_reset(struct mt7921_dev *dev)
 
 	mt7921_wpdma_reset(dev, true);
 
+	local_bh_disable();
 	mt76_for_each_q_rx(&dev->mt76, i) {
 		napi_enable(&dev->mt76.napi[i]);
 		napi_schedule(&dev->mt76.napi[i]);
 	}
+	local_bh_enable();
 
 	clear_bit(MT76_MCU_RESET, &dev->mphy.state);
 
@@ -1418,8 +1420,11 @@ mt7921_mac_reset(struct mt7921_dev *dev)
 out:
 	clear_bit(MT76_RESET, &dev->mphy.state);
 
+	local_bh_disable();
 	napi_enable(&dev->mt76.tx_napi);
 	napi_schedule(&dev->mt76.tx_napi);
+	local_bh_enable();
+
 	mt76_worker_enable(&dev->mt76.tx_worker);
 
 	return err;

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
@@ -302,12 +302,15 @@ static int mt7921_pci_resume(struct pci_dev *pdev)
 		 MT_WFDMA0_GLO_CFG_TX_DMA_EN | MT_WFDMA0_GLO_CFG_RX_DMA_EN);
 
 	mt76_worker_enable(&mdev->tx_worker);
+
+	local_bh_disable();
 	mt76_for_each_q_rx(mdev, i) {
 		napi_enable(&mdev->napi[i]);
 		napi_schedule(&mdev->napi[i]);
 	}
 	napi_enable(&mdev->tx_napi);
 	napi_schedule(&mdev->tx_napi);
+	local_bh_enable();
 
 	/* restore previous ds setting */
 	if (!pm->ds_enable)