Re: [PATCH] r8169: Reduce looping in the interrupt handler.

From: Francois Romieu
Date: Wed Aug 26 2009 - 17:26:28 EST

Eric W. Biederman <ebiederm@xxxxxxxxxxxx> :
> It is a bit weird but it also means we aren't playing silly games
> with status inside the loop. So if we go through the loop we ack
> everything in status.

I fear we have some longstanding problem anyway :

1. quiescent state
2. packets are received
3. rtl8169_interrupt schedules napi, clears IntrStatus and exits
4. packets are received and some non-napi event happens
5. rtl8169_interrupt wakes up, reads IntrStatus and goes on...
6. rtl8169_poll wakes up, processes Rx and Tx napi events and goes on...
7. tp->intr_mask still equals ~tp->napi_event : rtl8169_interrupt
handler does not even try to schedule napi.
8. more packets are received
9. rtl8169_interrupt clears IntrStatus
a. rtl8169_poll reenables napi scheduling, updates IntrMask and exits
b. rtl8169_interrupt reads a perfectly clean IntrStatus and exits

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