netdev - RE: [PATCH net-next] net: assign err to 0 at begin in do

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Date:   Wed, 15 Nov 2017 05:15:35 +0000
From:   "Yuan, Linyu (NSB - CN/Shanghai)" <linyu.yuan@...ia-sbell.com>
To:     David Miller <davem@...emloft.net>,
        "cugyly@....com" <cugyly@....com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH net-next] net: assign err to 0 at begin in do_setlink()
 function



> -----Original Message-----
> From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
> On Behalf Of David Miller
> Sent: Wednesday, November 15, 2017 1:08 PM
> To: cugyly@....com
> Cc: netdev@...r.kernel.org; Yuan, Linyu (NSB - CN/Shanghai)
> Subject: Re: [PATCH net-next] net: assign err to 0 at begin in do_setlink()
> function
> 
> From: yuan linyu <cugyly@....com>
> Date: Tue, 14 Nov 2017 22:30:59 +0800
> 
> > From: yuan linyu <Linyu.Yuan@...atel-sbell.com.cn>
> >
> > each netlink attribute have proper process when error happen,
> > when exit on attribute process, it implies that no error,
> > so err = 0; is useless.
> >
> > assign err = 0; at beginning if all attributes not set.
> >
> > Signed-off-by: yuan linyu <Linyu.Yuan@...atel-sbell.com.cn>
> 
> This change is not correct.
> 
> The IFLA_VF_PORTS code block can finish with err set non-zero.

Do you mean this block can return err = -EOPNOTSUPP;  ?
It means nla_for_each_nested() in this block will never enter, right ?

> The assignment to zero there is really necessary.