Search Linux Wireless

Re: [PATCH] wifi: mt76: mt7921s: fix potential hung tasks during chip recovery

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 3/7/24 01:46, Mingyen Hsieh wrote:
From: Leon Yen <leon.yen@xxxxxxxxxxxx>

During chip recovery (e.g. chip reset), there is a possible situation that
kernel worker reset_work is holding the lock and waiting for kernel thread
stat_worker to be parked, while stat_worker is waiting for the release of
the same lock.
It causes a deadlock resulting in the dumping of hung tasks messages and
possible rebooting of the device.

This patch prevents the execution of stat_worker during the chip recovery.

Hello,

I was able to hang my 7996 system doing a radio reset yesterday.  Is this same
or similar fix needed for 7996?

Thanks
Ben


Signed-off-by: Leon Yen <leon.yen@xxxxxxxxxxxx>
Signed-off-by: Ming Yen Hsieh <MingYen.Hsieh@xxxxxxxxxxxx>
---
  drivers/net/wireless/mediatek/mt76/mt7921/mac.c      | 2 ++
  drivers/net/wireless/mediatek/mt76/mt7921/pci_mac.c  | 2 --
  drivers/net/wireless/mediatek/mt76/mt7921/sdio_mac.c | 2 --
  drivers/net/wireless/mediatek/mt76/sdio.c            | 3 ++-
  4 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
index 867e14f6b93a..73e42ef42983 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
@@ -663,6 +663,7 @@ void mt7921_mac_reset_work(struct work_struct *work)
  	int i, ret;
dev_dbg(dev->mt76.dev, "chip reset\n");
+	set_bit(MT76_RESET, &dev->mphy.state);
  	dev->hw_full_reset = true;
  	ieee80211_stop_queues(hw);
@@ -691,6 +692,7 @@ void mt7921_mac_reset_work(struct work_struct *work)
  	}
dev->hw_full_reset = false;
+	clear_bit(MT76_RESET, &dev->mphy.state);
  	pm->suspended = false;
  	ieee80211_wake_queues(hw);
  	ieee80211_iterate_active_interfaces(hw,
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci_mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci_mac.c
index c866144ff061..031ba9aaa4e2 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/pci_mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci_mac.c
@@ -64,7 +64,6 @@ int mt7921e_mac_reset(struct mt792x_dev *dev)
  	mt76_wr(dev, dev->irq_map->host_irq_enable, 0);
  	mt76_wr(dev, MT_PCIE_MAC_INT_ENABLE, 0x0);
- set_bit(MT76_RESET, &dev->mphy.state);
  	set_bit(MT76_MCU_RESET, &dev->mphy.state);
  	wake_up(&dev->mt76.mcu.wait);
  	skb_queue_purge(&dev->mt76.mcu.res_q);
@@ -115,7 +114,6 @@ int mt7921e_mac_reset(struct mt792x_dev *dev)
err = __mt7921_start(&dev->phy);
  out:
-	clear_bit(MT76_RESET, &dev->mphy.state);
local_bh_disable();
  	napi_enable(&dev->mt76.tx_napi);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mac.c
index 389eb0903807..1f77cf71ca70 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mac.c
@@ -98,7 +98,6 @@ int mt7921s_mac_reset(struct mt792x_dev *dev)
  	mt76_connac_free_pending_tx_skbs(&dev->pm, NULL);
  	mt76_txq_schedule_all(&dev->mphy);
  	mt76_worker_disable(&dev->mt76.tx_worker);
-	set_bit(MT76_RESET, &dev->mphy.state);
  	set_bit(MT76_MCU_RESET, &dev->mphy.state);
  	wake_up(&dev->mt76.mcu.wait);
  	skb_queue_purge(&dev->mt76.mcu.res_q);
@@ -135,7 +134,6 @@ int mt7921s_mac_reset(struct mt792x_dev *dev)
err = __mt7921_start(&dev->phy);
  out:
-	clear_bit(MT76_RESET, &dev->mphy.state);
mt76_worker_enable(&dev->mt76.tx_worker); diff --git a/drivers/net/wireless/mediatek/mt76/sdio.c b/drivers/net/wireless/mediatek/mt76/sdio.c
index 3e88798df017..a4ed00eebc48 100644
--- a/drivers/net/wireless/mediatek/mt76/sdio.c
+++ b/drivers/net/wireless/mediatek/mt76/sdio.c
@@ -499,7 +499,8 @@ static void mt76s_tx_status_data(struct mt76_worker *worker)
  	dev = container_of(sdio, struct mt76_dev, sdio);
while (true) {
-		if (test_bit(MT76_REMOVED, &dev->phy.state))
+		if (test_bit(MT76_RESET, &dev->phy.state) ||
+		    test_bit(MT76_REMOVED, &dev->phy.state))
  			break;
if (!dev->drv->tx_status_data(dev, &update))

--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc  http://www.candelatech.com






[Index of Archives]     [Linux Host AP]     [ATH6KL]     [Linux Wireless Personal Area Network]     [Linux Bluetooth]     [Wireless Regulations]     [Linux Netdev]     [Kernel Newbies]     [Linux Kernel]     [IDE]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite Hiking]     [MIPS Linux]     [ARM Linux]     [Linux RAID]

  Powered by Linux