[PATCH net v2 1/1] mlxbf_gige: Fix kernel panic at shutdown

[Asmaa Mnebhi <asmaa@nvidia.com>]

There is a race condition happening during shutdown due to pending napi transactions.
Since mlxbf_gige_poll is still running, it tries to access a NULL pointer and as a
result causes a kernel panic.
To fix this during shutdown, invoke mlxbf_gige_remove to disable and dequeue napi.

Fixes: f92e1869d74e ("Add Mellanox BlueField Gigabit Ethernet driver")
Signed-off-by: Asmaa Mnebhi <asmaa@nvidia.com>
---
 .../net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c    | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c
index 694de9513b9f..609d038b034e 100644
--- a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c
+++ b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c
@@ -475,6 +475,9 @@ static int mlxbf_gige_remove(struct platform_device *pdev)
 {
 	struct mlxbf_gige *priv = platform_get_drvdata(pdev);
 
+	if (!priv)
+		return 0;
+
 	unregister_netdev(priv->netdev);
 	phy_disconnect(priv->netdev->phydev);
 	mlxbf_gige_mdio_remove(priv);
@@ -485,10 +488,7 @@ static int mlxbf_gige_remove(struct platform_device *pdev)
 
 static void mlxbf_gige_shutdown(struct platform_device *pdev)
 {
-	struct mlxbf_gige *priv = platform_get_drvdata(pdev);
-
-	writeq(0, priv->base + MLXBF_GIGE_INT_EN);
-	mlxbf_gige_clean_port(priv);
+	mlxbf_gige_remove(pdev);
 }
 
 static const struct acpi_device_id __maybe_unused mlxbf_gige_acpi_match[] = {
-- 
2.30.1