Re: [patch] net, 8139too.c: fix netpoll deadlock

[Atsushi Nemoto]

Let me resume two months old topic...

On Wed, 13 Dec 2006 02:12:31 +0100, Ingo Molnar <mingo@xxxxxxx> wrote:
> > I have lived with the "NAPI ->poll() handler runs in BH irq enabled 
> > context" rule for years. Is it definitely false/dead ?
> > 
> > If so at least 8139cp needs the same fix.
> 
> hm, this isnt really about NAPI polling, but about the 
> netconsole/netpoll/netdump poll_controller() handler.
> 
> with netconsole, printk can be called from IRQ context (and is 
> frequently from IRQ context during bootup or module initialization), so 
> a BH rule isnt enough for them.

I see NAPI poll routine might be called with interrupt disabled.

Many (all?) NAPI drivers call netif_receive_skb() from its poll
routine (as described in NAPI-HOWTO.txt), but I thought
netif_receive_skb() cannot be called from irq context or irq disabled.
So it seems the problem is not solved completely.  Or am I missing
something?

---
Atsushi Nemoto
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/