linux-kernel - Re: [PATCH][v6] netlink: have netlink per-protocol bind function return an error code.

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Message-ID: <20140326231342.GA22381@macbook.localnet>
Date:	Wed, 26 Mar 2014 23:13:42 +0000
From:	Patrick McHardy <kaber@...sh.net>
To:	Richard Guy Briggs <rgb@...hat.com>
Cc:	linux-audit@...hat.com, linux-kernel@...r.kernel.org,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	eparis@...hat.com, sgrubb@...hat.com, hadi@...atatu.com,
	davem@...emloft.net
Subject: Re: [PATCH][v6] netlink: have netlink per-protocol bind function
 return an error code.

On Tue, Mar 25, 2014 at 08:50:56AM -0400, Richard Guy Briggs wrote:
> +	if (nlk->netlink_bind && nladdr->nl_groups) {
> +		int i;
> +
> +		for (i = 0; i < nlk->ngroups; i++)
> +			if (test_bit(i, (long unsigned int *)&nladdr->nl_groups)) {
> +				err = nlk->netlink_bind(i);
> +				if (err) {
> +					int undo;
> +					if (!nlk->portid)
> +						netlink_remove(sk);
> +					for (undo = 0; undo < i; undo++)
> +						if (nlk->netlink_unbind)
> +							nlk->netlink_unbind(undo);

Do we really need 7 levels of indentation? You could save at least
one by using

if (!test_bit(...)
	continue;
...

Or maybe simply move this to a helper function.



> +					return err;
> +				}
> +			}
> +	}
> +
>  	netlink_table_grab();
>  	netlink_update_subscriptions(sk, nlk->subscriptions +
>  					 hweight32(nladdr->nl_groups) -
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