linux-kernel - Re: [PATCH 1/2] workqueue: fix bugs in wq_update_unbound

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Message-ID: <CACvQF52acD74ZKZeLL5M-vQKH5E+QH0bTXAS-H18rJYAVk-NuQ@mail.gmail.com>
Date:	Thu, 17 Apr 2014 00:22:41 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Daeseok Youn <daeseok.youn@...il.com>
Cc:	Tejun Heo <tj@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] workqueue: fix bugs in wq_update_unbound_numa()
 failure path

Acked.

On Wed, Apr 16, 2014 at 1:32 PM, Daeseok Youn <daeseok.youn@...il.com> wrote:
>
> wq_update_unbound_numa() failure path has the following two bugs.
>  - alloc_unbound_pwq() is called without holding wq->mutex;
>  however, if the allocation fails, it jumps to out_unlock
>  which tries to unlock wq->mutex.
>
>  - The function should switch to dfl_pwq on failure
>  but didn't do so after alloc_unbound_pwq() failure.
>
> Fix it by regrabbing wq->mutex and jumping to use_dfl_pwq on
> alloc_unbound_pwq() failure.
>
> Signed-off-by: Daeseok Youn <daeseok.youn@...il.com>
> ---
>  kernel/workqueue.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> index 0ee63af..3150b21 100644
> --- a/kernel/workqueue.c
> +++ b/kernel/workqueue.c
> @@ -4100,7 +4100,8 @@ static void wq_update_unbound_numa(struct workqueue_struct *wq, int cpu,
>         if (!pwq) {
>                 pr_warning("workqueue: allocation failed while updating NUMA affinity of \"%s\"\n",
>                            wq->name);
> -               goto out_unlock;
> +               mutex_lock(&wq->mutex);
> +               goto use_dfl_pwq;
>         }
>
>         /*
> --
> 1.7.4.4
>
>
> --
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