Re: [PATCH net] net: stmmac: dwmac-motorcomm: mask the MISC interrupt

[Maxime Chevallier]

Hi,

On 11/2/26 09:29, Nicolai Buchwitz wrote:
> Hi Magnus
> 
> On 2.11.2026 09:09, Magnus Leatti wrote:
> 
>> [...]
> 
>> Russell, d3265c19b35d ("net: stmmac: xgmac2: disable RBUE in default RX
>> interrupt mask") describes a similar storm on xgmac2. Should dwmac4 do
>> the same? I have only tested the glue change.
> 
> AFAIU RBU is the cause. Dropping it in dwmac4, as Russel did in  d3265c19b35d,
> would cover all multi-MSI users.

As I commented, the other solution is to properly ack it. I'm not convinced about
the RBU interrupt's usefulness TBH, even when ack'd it makes a bad situation even
worse, but it does have the nice effect of making this visible by incrementing the
associated counter.

Anyway, this issue should be covered by this :

https://lore.kernel.org/all/20261030102251.208929-1-maxime.chevallier@xxxxxxxxxxx/

Maxime