linux-kernel - Re: [PATCH block/for-3.5/core] blkcg: tg_stats_alloc

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Message-ID: <CA+1xoqff_OQORFm05fCqeZ-vCt+2Y9H0KNfSxrCepfCDNGZgXQ@mail.gmail.com>
Date:	Wed, 23 May 2012 11:54:14 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Sasha Levin <sasha.levin@...cle.com>, axboe@...nel.dk,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH block/for-3.5/core] blkcg: tg_stats_alloc_lock is an irq lock

On Thu, Apr 26, 2012 at 11:10 PM, Tejun Heo <tj@...nel.org> wrote:
> tg_stats_alloc_lock nests inside queue lock and should always be held
> with irq disabled.  throtl_pd_{init|exit}() were using non-irqsafe
> spinlock ops which triggered inverse lock ordering via irq warning via
> RCU freeing of blkg invoking throtl_pd_exit() w/o disabling IRQ.
>
> Update both functions to use irq safe operations.
>
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Reported-by: Sasha Levin <sasha.levin@...cle.com>
> LKML-Reference: <1335339396.16988.80.camel@...py>
> ---

I think that this patch got lost somewhere and never got merged into
the for-3.5 branch.
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