Subject: Re: [PATCH] net: Adjust softirq raising in __napi_schedule

From: Jarek Poplawski <[email-masked]>
Date: Mon, 26 Oct 2009 07:41:26 +0000

On Fri, Oct 23, 2009 at 04:46:31PM +0200, Johannes Berg wrote:
> On Fri, 2009-10-23 at 16:39 +0200, Tilman Schmidt wrote:
> 
> > Strange. Then what are the two separate functions netif_rx() and
> > netif_rx_ni() for?
> 
> netif_rx_ni() disables preemption.

You wrote earlier:

> [...] the networking layer needs to have
> packets handed to it with softirqs disabled.

How disabling preemption can fix something which needs softirqs
disabled? Could you be more precise?

> > > This really should be obvious. You're fixing the warning at the source
> > > of the warning, rather than the source of the problem.
> > 
> > Good idea. So please do tell us where the source of the problem is.
> 
> You use netif_rx_ni() instead of netif_rx() at whatever place that
> causes this problem.

This isn't a very precise description either.

Jarek P.