netdev - [PATCH net] bnxt_en: fix module unload sequence

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Message-ID: <20250430170343.759126-1-vadfed@meta.com>
Date: Wed, 30 Apr 2025 10:03:43 -0700
From: Vadim Fedorenko <vadfed@...a.com>
To: Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
        Michael Chan
	<michael.chan@...adcom.com>,
        Pavan Chebbi <pavan.chebbi@...adcom.com>,
        Jakub
 Kicinski <kuba@...nel.org>
CC: Richard Cochran <richardcochran@...il.com>,
        Taehee Yoo
	<ap420073@...il.com>, <netdev@...r.kernel.org>
Subject: [PATCH net] bnxt_en: fix module unload sequence

Recent updates to the PTP part of bnxt changed the way PTP FIFO is
cleared, skbs waiting for TX timestamps are now cleared during
ndo_close() call. To do clearing procedure, the ptp structure must
exist and point to a valid address. Module destroy sequence had ptp
clear code running before netdev close causing invalid memory access and
kernel crash. Change the sequence to destroy ptp structure after device
close.

Fixes: 8f7ae5a85137 ("bnxt_en: improve TX timestamping FIFO configuration")
Reported-by: Taehee Yoo <ap420073@...il.com>
Closes: https://lore.kernel.org/netdev/CAMArcTWDe2cd41=ub=zzvYifaYcYv-N-csxfqxUvejy_L0D6UQ@mail.gmail.com/
Signed-off-by: Vadim Fedorenko <vadfed@...a.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 78e496b0ec26..86a5de44b6f3 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -16006,8 +16006,8 @@ static void bnxt_remove_one(struct pci_dev *pdev)
 
 	bnxt_rdma_aux_device_del(bp);
 
-	bnxt_ptp_clear(bp);
 	unregister_netdev(dev);
+	bnxt_ptp_clear(bp);
 
 	bnxt_rdma_aux_device_uninit(bp);
 
-- 
2.47.1