[SRU][F/J:linux-bluefield][PATCH v1 1/1] UBUNTU: SAUCE: mlxbf-gige: Fix kernel panic at shutdown

[Asmaa Mnebhi]

BugLink: https://bugs.launchpad.net/bugs/2022370

We occasionally see a race condition (once every 350 reboots) where napi is still
running (mlxbf_gige_poll) while a shutdown has been initiated through "reboot".
Since mlxbf_gige_poll is still running, it tries to access a NULL pointer and as
a result causes a kernel panic.

The fix is to explicitly disable napi and dequeue it during shutdown.
mlxbf_gige_remove already calls:
unregister_netdev->unregister_netdevice->unregister_netdev_queue->
rollback_registered->rollback_registered_many->dev_close_many->
__dev_close_many->ndo_stop->mlxbf_gige_stop which stops napi

So use mlxbf_gige_remove in place of the existing shutdown logic.

Signed-off-by: Asmaa Mnebhi <asmaa at nvidia.com>
---
 drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c | 5 +----
 1 file changed, 1 insertion(+), 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 7291ca6627f1..7de778bd2e2e 100644
--- a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c
+++ b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c
@@ -485,10 +485,7 @@ 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