Re: [PATCH net 2/2] net: macb: mask TXUBR during TX NAPI poll to prevent IRQ storms

[Taedcke, Christian]

On 7/6/2026 5:05 PM, Sebastian Andrzej Siewior wrote:
> On 2026-07-06 16:02:15 [+0200], Christian Taedcke via B4 Relay wrote:
>> From: Christian Taedcke <christian.taedcke@xxxxxxxxxxxxxxx>
>>
>> macb_interrupt() defers TX completion handling to NAPI, but when it
>> schedules the poll it only masks TCOMP, even though TXUBR is enabled
>> alongside it (both are part of MACB_TX_INT_FLAGS). macb_tx_poll() is
>> asymmetric in the same way and only re-enables TCOMP. TXUBR is thus
>> left unmasked while responsibility for handling it has been deferred
>> to NAPI.
> 
> So this is not a race condition, this is always a failure?

As far as in understand it: yes

> 
> Sebastian

Christian