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

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Date:   Wed, 15 Nov 2017 05:22:08 +0000
From:   "Yuan, Linyu (NSB - CN/Shanghai)" <linyu.yuan@...ia-sbell.com>
To:     David Miller <davem@...emloft.net>
CC:     "cugyly@....com" <cugyly@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH net-next] net: assign err to 0 at begin in do_setlink()
 function

Thanks, I will provide a new patch

> -----Original Message-----
> From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
> On Behalf Of David Miller
> Sent: Wednesday, November 15, 2017 1:20 PM
> To: Yuan, Linyu (NSB - CN/Shanghai)
> Cc: cugyly@....com; netdev@...r.kernel.org
> Subject: Re: [PATCH net-next] net: assign err to 0 at begin in do_setlink()
> function
> 
> From: "Yuan, Linyu (NSB - CN/Shanghai)" <linyu.yuan@...ia-sbell.com>
> Date: Wed, 15 Nov 2017 05:15:35 +0000
> 
> >
> >
> >> -----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 ?
> 
> Yes, that is what I mean.