netdev - [PATCH net-next v1 1/1] mlxbf_gige: Fix kernel panic at shutdown

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Date: Fri, 2 Jun 2023 14:24:43 -0400
From: Asmaa Mnebhi <asmaa@...dia.com>
To: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>
CC: Asmaa Mnebhi <asmaa@...dia.com>, <netdev@...r.kernel.org>,
	<cai.huoqing@...ux.dev>, <brgl@...ev.pl>, <chenhao288@...ilicon.com>,
	<huangguangbin2@...wei.com>, David Thompson <davthompson@...dia.com>
Subject: [PATCH net-next v1 1/1] mlxbf_gige: Fix kernel panic at shutdown

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@...dia.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 694de9513b9f..7017f14595db 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