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[SRU,F/J:linux-bluefield,v1,2/2] UBUNTU: SAUCE: mlxbf-gige: Fix kernel panic after reboot

Message ID 20230808140025.12302-3-asmaa@nvidia.com
State New
Headers show
Series [SRU,F/J:linux-bluefield,v1,1/2] UBUNTU: SAUCE: mlxbf-gige: Fix kernel panic after reboot | expand

Commit Message

Asmaa Mnebhi Aug. 8, 2023, 2 p.m. UTC 
BugLink: https://bugs.launchpad.net/bugs/2030765

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.

Add a check for when "priv" is NULL.

Signed-off-by: Asmaa Mnebhi <asmaa@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_rx.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_rx.c b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_rx.c
index f21dafde490b..75466f713ade 100644
--- a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_rx.c
+++ b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_rx.c
@@ -298,6 +298,9 @@  int mlxbf_gige_poll(struct napi_struct *napi, int budget)
 
 	priv = container_of(napi, struct mlxbf_gige, napi);
 
+	if (!priv)
+		return 0;
+
 	mlxbf_gige_handle_tx_complete(priv);
 
 	data = readq(priv->base + MLXBF_GIGE_RX_DMA);