netdev - Re: [PATCH net-next] net: remove useless check in napi_gro

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Message-Id: <20151120.145914.2164877853297235919.davem@davemloft.net>
Date:	Fri, 20 Nov 2015 14:59:14 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	aconole@...hat.com, bjorn@...k.no, alexei.starovoitov@...il.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: remove useless check in napi_gro_frags()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 19 Nov 2015 13:43:45 -0800

> On Thu, 2015-11-19 at 16:06 -0500, Aaron Conole wrote:
> 
>> >
>> 
>> Would the following be an appropriate change in addition to the one
>> you've posted, then? If so I can repost as a formal patch, if you'd
>> like. At present, there's only one user of napi_frags_skb(), and your
>> patch removes the NULL check. If this can really only be the result of
>> buggy driver, then perhaps we should just call out the bug?
> 
> Lets mark my patch as "premature" optimization, and revisit whole thing
> after audit of the 10 drivers using this interface ;)

Also BUG_ON() is way too large a hammer.

An attempt to continue should be made in some way, so that person
inspecting the message and still have a network and work on fixing
the driver after the check triggers :-)
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