linux-kernel - Re: [PATCH block/for-3.4/core] cfq: fix cfqg ref handling when BLK_CGROUP && !CFQ_GROUP

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Message-ID: <20120315164621.GD3253@redhat.com>
Date:	Thu, 15 Mar 2012 12:46:21 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Fengguang Wu <fengguang.wu@...el.com>,
	Jens Axboe <axboe@...nel.dk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH block/for-3.4/core] cfq: fix cfqg ref handling when
 BLK_CGROUP && !CFQ_GROUP_IOSCHED

On Thu, Mar 15, 2012 at 09:35:46AM -0700, Tejun Heo wrote:

[..]
> ---
> Yeap, forgot to test that config combination.  Fengguang, can you
> please test this patch?  Jens, once Fengguang confirms the fix, can
> you please apply this on top of for-3.4/core along with the pending
> stats updates?

I was working on similar patch and you beat me to it. :-) One comment
below.

[..]
> @@ -3533,7 +3551,7 @@ static int cfq_init_queue(struct request
>  
>  	spin_lock_irq(q->queue_lock);
>  	cfq_link_cfqq_cfqg(&cfqd->oom_cfqq, cfqd->root_group);
> -	blkg_put(cfqg_to_blkg(cfqd->root_group));
> +	cfqg_put(cfqd->root_group);

This seems to be a spurious cfqg_put()? Which reference we are putting
down here?

Thanks
Vivek
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