netdev - Re: rndis gadget: Inconsistent locking

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Message-ID: <20110112132314.GA9920@ff.dom.local>
Date:	Wed, 12 Jan 2011 13:23:14 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Brownell <david-b@...bell.net>,
	Michał Nazarewicz <m.nazarewicz@...sung.com>,
	Neil Jones <neiljay@...il.com>, linux-usb@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: rndis gadget: Inconsistent locking

On Wed, Jan 12, 2011 at 02:07:12PM +0100, Eric Dumazet wrote:
...
> 
> Hmm... 
> 
> So all net devices in gen_ndis_query_resp() should have a
> ndo_get_stats() or ndo_get_stats64() method, not allowed to use
> spin_lock_bh() / spin_unlock_bh()
> 
> If yes, we should add big fat comments to pn_net_stats()/eth_get_stats() so that nobody
> tries to revert your patch ;)

I'm not sure I got your point: my patch could be replaced with
ndo_get_stats64() implementing irq safe locking or by changing
gen_ndis_query_resp() calling context. It's intended as a fast
(compatible) fix.

Jarek P.
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