netdev - Re: [PATCH 1/2] tc: check for errors from gen_replace

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Date:	Tue, 25 Nov 2008 19:28:47 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] tc: check for errors from gen_replace_estimator

Stephen Hemminger wrote:
> gen_replace_estimator can return errors, but they were being ignored.
> 
> --- a/net/sched/sch_hfsc.c	2008-11-25 10:02:05.000000000 -0800
> +++ b/net/sched/sch_hfsc.c	2008-11-25 10:07:21.000000000 -0800
> @@ -1035,10 +1035,10 @@ hfsc_change_class(struct Qdisc *sch, u32
>  		sch_tree_unlock(sch);
>  
>  		if (tca[TCA_RATE])
> -			gen_replace_estimator(&cl->bstats, &cl->rate_est,
> +			err = gen_replace_estimator(&cl->bstats, &cl->rate_est,
>  					      qdisc_root_sleeping_lock(sch),
>  					      tca[TCA_RATE]);
> -		return 0;
> +		return err;

At this point we've already made changes to the class, so
returning an error without undoing them is wrong.

I'd suggest to move the estimator replacement up a bit, the
other changes can't fail.

There's also gen_new_estimator() that should be treated
similary for consistency.
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