Re: [PATCH net v3] net: macb: Relocate mog_init_rings() callback from macb_mac_link_up() to macb_open()

[Kevin Hao]

On Thu, Feb 19, 2026 at 03:34:54PM +0100, Alexander Dahl wrote:
> After upgrading from 6.12.57-rt14 to 6.12.66-rt15 on a custom at91
> sam9x60 based board with PREEMPT_RT patch, we noticed a complete
> system lockup, which I bisected to this changeset.
> 
> After unplugging and plugging the ethernet cable, while
> running PROFINET, system does not respond to anything anymore.
> Last message in kernel log is:
> 
>   [  +8.621919] macb f802c000.ethernet eth0: Link is Up - 100Mbps/Full - flow control off
> 
> Heartbeat LED does not blink anymore, no network communication,
> serial console does not respond anymore.
> 
> Reverting that change locally prevents the system lockup for me, but
> what is the proper course of action on kernel side now?  Send a revert
> to stable?  Send a revert to master?  Please advise.
> 
> (I'm aware there were least two more patches on netdev referencing
> this change, but if I'm not mistaken none of those made it to stable,
> right?)

A fix for this commit is available in the latest mainline kernel. Could you
please verify whether it resolves the issue you encountered?
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bf9cf80cab81e39701861a42877a28295ade266f

Thanks,
Kevin

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