linux-kernel - Re: [PATCH net-next] net: dcb: move getapptrust to separate function

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Date:   Fri, 11 Nov 2022 06:45:18 +0000
From:   <Daniel.Machon@...rochip.com>
To:     <petrm@...dia.com>
CC:     <netdev@...r.kernel.org>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <joe@...ches.com>, <vladimir.oltean@....com>,
        <linux-kernel@...r.kernel.org>, <UNGLinuxDriver@...rochip.com>,
        <lkp@...el.com>
Subject: Re: [PATCH net-next] net: dcb: move getapptrust to separate function

Den Thu, Nov 10, 2022 at 05:30:43PM +0100 skrev Petr Machata:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Daniel Machon <daniel.machon@...rochip.com> writes:
> 
> > diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
> > index cec0632f96db..3f4d88c1ec78 100644
> > --- a/net/dcb/dcbnl.c
> > +++ b/net/dcb/dcbnl.c
> > @@ -1060,11 +1060,52 @@ static int dcbnl_build_peer_app(struct net_device *netdev, struct sk_buff* skb,
> >       return err;
> >  }
> >
> > +static int dcbnl_getapptrust(struct net_device *netdev, struct sk_buff *skb)
> > +{
> > +     const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
> > +     int nselectors, err;
> > +     u8 *selectors;
> > +
> > +     selectors = kzalloc(IEEE_8021QAZ_APP_SEL_MAX + 1, GFP_KERNEL);
> > +     if (!selectors)
> > +             return -ENOMEM;
> > +
> > +     err = ops->dcbnl_getapptrust(netdev, selectors, &nselectors);
> > +
> > +     if (!err) {
> > +             struct nlattr *apptrust;
> > +             int i;
> 
> (Maybe consider moving these up to the function scope. This scope
> business made sense in the generic function, IMHO is not as useful with
> a focused function like this one.)

I dont mind doing that, however, this 'scope business' is just staying true
to the rest of the dcbnl code :-) - that said, I think I agree with your
point.

> 
> > +
> > +             err = -EMSGSIZE;
> > +
> > +             apptrust = nla_nest_start(skb, DCB_ATTR_DCB_APP_TRUST_TABLE);
> > +             if (!apptrust)
> > +                     goto nla_put_failure;
> > +
> > +             for (i = 0; i < nselectors; i++) {
> > +                     enum ieee_attrs_app type =
> > +                             dcbnl_app_attr_type_get(selectors[i]);
> 
> Doesn't checkpatch warn about this? There should be a blank line after
> the variable declaration block. (Even if there wasn't one there in the
> original code either.)

Nope, no warning. And I think it has something to do with the way the line
is split.

> 
> > +                     err = nla_put_u8(skb, type, selectors[i]);
> > +                     if (err) {
> > +                             nla_nest_cancel(skb, apptrust);
> > +                             goto nla_put_failure;
> > +                     }
> > +             }
> > +             nla_nest_end(skb, apptrust);
> > +     }
> > +
> > +     err = 0;
> > +
> > +nla_put_failure:
> > +     kfree(selectors);
> > +     return err;
> > +}
> > +