5.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Heiner Kallweit <hkallweit1@xxxxxxxxx>
[ Upstream commit 91d3d149978ba7b238198dd80e4b823756aa7cfa ]
ndo_stop() is RTNL-protected by net core, and the worker function takes
RTNL as well. Therefore we will deadlock when trying to execute a
pending work synchronously. To fix this execute any pending work
asynchronously. This will do no harm because netif_running() is false
in ndo_stop(), and therefore the work function is effectively a no-op.
However we have to ensure that no task is running or pending after
rtl_remove_one(), therefore add a call to cancel_work_sync().
Fixes: abe5fc42f9ce ("r8169: use RTNL to protect critical sections")
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
Link: https://lore.kernel.org/r/12395867-1d17-4cac-aa7d-c691938fcddf@xxxxxxxxx
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/ethernet/realtek/r8169_main.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index ab6af1f1ad5bb..d33720f68c679 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -4769,7 +4769,7 @@ static int rtl8169_close(struct net_device *dev)
rtl8169_down(tp);
rtl8169_rx_clear(tp);
- cancel_work_sync(&tp->wk.work);
+ cancel_work(&tp->wk.work);
free_irq(pci_irq_vector(pdev, 0), tp);
@@ -5035,6 +5035,8 @@ static void rtl_remove_one(struct pci_dev *pdev)
if (pci_dev_run_wake(pdev))
pm_runtime_get_noresume(&pdev->dev);
+ cancel_work_sync(&tp->wk.work);
+
unregister_netdev(tp->dev);
if (r8168_check_dash(tp))
--
2.42.0
