Re: [PATCH net v3] net: fec: Propagate PTP initialization errors

quoted

This is a pre-existing issue:

Previously, I suggested using request_irq() and free_irq() manually,
but that would add more code.
Another option is to replace alloc_etherdev_mqs() with
devm_alloc_etherdev_mqs(). With the LIFO cleanup order,
devm_request_irq() will be cleaned up before free_netdev(res->ndev),
which should resolve the issue.

Since this is a long-standing, pre-existing issue, I think it would be
better to handle it in a separate patch.

This issue is currently being addressed in another thread:
https://lore.kernel.org/imx/20260904-fec-ptp-pps-event-uaf-v1-2-9af446be4a11@cherr.cc/ (local)

Oh, great! I see it now.

However, it looks like that patch does not fully address the root cause.

There are two places where devm_request_irq() is called:
For PPS in fec_ptp_init().

In probe():
devm_request_irq(&pdev->dev, irq, fec_enet_interrupt,
0, pdev->name, ndev);

The approach in that patch only handles the first case, so it does not
fully solve the problem.