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bnxt_en: Shutdown FW DMA in bnxt_shutdown()

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The netif_close() call in bnxt_shutdown() only stops packet DMA.  There
may be FW DMA for trace logging (recently added) that will continue.  If
we kexec to a new kernel, the DMA will corrupt memory in the new kernel.

Add bnxt_hwrm_func_drv_unrgtr() to unregister the driver from the FW.
This will stop the FW DMA.  In case the call fails, call pcie_flr() to
reset the function and stop the DMA.

Fixes: 24d694aec1 ("bnxt_en: Allocate backing store memory for FW trace logs")
Reported-by: Jakub Kicinski <kicinski@meta.com>
Reviewed-by: Damodharam Ammepalli <damodharam.ammepalli@broadcom.com>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://patch.msgid.link/20251104005700.542174-2-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Michael Chan 2025-11-03 16:56:55 -08:00 committed by Jakub Kicinski
parent c3838262b8
commit bc7208ca80
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ethernet/broadcom/bnxt/bnxt.c
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@ -16892,6 +16892,10 @@ static void bnxt_shutdown(struct pci_dev *pdev)
if (netif_running(dev))
netif_close(dev);
if (bnxt_hwrm_func_drv_unrgtr(bp)) {
pcie_flr(pdev);
goto shutdown_exit;
}
bnxt_ptp_clear(bp);
bnxt_clear_int_mode(bp);
pci_disable_device(pdev);