netdev - Re: [PATCH 1/5] netlink: simplify netlink_policy_dump

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Date:   Fri, 02 Oct 2020 22:02:03 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH 1/5] netlink: simplify netlink_policy_dump_start()
 prototype

On Fri, 2020-10-02 at 08:31 -0700, Jakub Kicinski wrote:
> On Fri,  2 Oct 2020 11:09:40 +0200 Johannes Berg wrote:
> > From: Johannes Berg <johannes.berg@...el.com>
> > 
> > Since moving the call to this to a dump start() handler we no
> > longer need this to deal with being called after having been
> > called already. Since that is the preferred way of doing things
> > anyway, remove the code necessary for that and simply return
> > the pointer (or an ERR_PTR()).
> > 
> > Signed-off-by: Johannes Berg <johannes.berg@...el.com>
> 
> Reviewed-by: Jakub Kicinski <kuba@...nel.org>
> 
> > -	return netlink_policy_dump_start(op.policy, op.maxattr, &ctx->state);
> > +	ctx->state = netlink_policy_dump_start(op.policy, op.maxattr);
> > +	if (IS_ERR(ctx->state))
> > +		return PTR_ERR(ctx->state);
> > +	return 0;
> 
> PTR_ERR_OR_ZERO()?

Hah! I didn't even know about that, thanks.

johannes