netdev - Re: [PATCH] sky2: safer transmit ring cleaning (v2)

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Message-ID: <20100112112314.6d3b37d0@nehalam>
Date:	Tue, 12 Jan 2010 11:23:14 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	David Miller <davem@...emloft.net>, mikem@...g3k.org,
	flyboy@...il.com, rjw@...k.pl, netdev@...r.kernel.org,
	mbreuer@...jas.com
Subject: Re: [PATCH] sky2: safer transmit ring cleaning (v2)

On Tue, 12 Jan 2010 20:16:11 +0100
Jarek Poplawski <jarkao2@...il.com> wrote:

> > 
> > What is supposed to happen:
> >   * restart sky2_restart calls napi_disable while cleaning  
> 
> Yes, but it's after the detach; similarly to sky2_suspend().
> (I'm not sure how safe vs such re-enabling is sky2_set_ringparam().

set_ringparam happens under rtnl_lock() so reset and ringparams can't
conflict.

> 
> >   * dev_close we can't call napi_disable() because of two ports
> >     sharing same NAPI, so napi_synchronize() is used to make sure that
> >     any NAPI running on other CPU has completed.  
> 
> So it seems still endangered.

It was but not in revised v2 patch.
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