netdev - Re: [PATCH] net: Adjust softirq raising in __napi

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Date:	Mon, 26 Oct 2009 08:44:14 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	Tilman Schmidt <tilman@...p.cc>,
	David Miller <davem@...emloft.net>, hidave.darkstar@...il.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	linux-wireless@...r.kernel.org, linux-ppp@...r.kernel.org,
	netdev@...r.kernel.org, paulus@...ba.org,
	Michael Buesch <mb@...sch.de>,
	Oliver Hartkopp <oliver@...tkopp.net>
Subject: Re: [PATCH] net: Adjust softirq raising in __napi_schedule

On Mon, 2009-10-26 at 07:41 +0000, Jarek Poplawski wrote:

> > 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?

No, I wrote that I didn't know. I suppose now that I looked at it I do
know, and only disabling preemption is required.

johannes

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