linux-kernel - Re: [PATCH 1/5] lightnvm: pblk: fix race condition on line retry

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Message-ID: <9781715a-68ea-b677-aff4-155b8a3b59b7@lightnvm.io>
Date:   Sat, 22 Apr 2017 10:51:34 +0200
From:   Matias Bjørling <mb@...htnvm.io>
To:     Javier González <jg@...htnvm.io>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Javier González <javier@...xlabs.com>
Subject: Re: [PATCH 1/5] lightnvm: pblk: fix race condition on line retry

On 04/22/2017 01:32 AM, Javier González wrote:
> When a pblk line fails (or is recovered), make sure to take the line
> management lock.
>
> Fixes: a4bd217b4326 "lightnvm: physical block device (pblk) target"
>
> Signed-off-by: Javier González <javier@...xlabs.com>
> ---
>  drivers/lightnvm/pblk-core.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
> index a2bcd09..7065658 100644
> --- a/drivers/lightnvm/pblk-core.c
> +++ b/drivers/lightnvm/pblk-core.c
> @@ -1050,13 +1050,14 @@ int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line)
>  	spin_lock(&l_mg->free_lock);
>  	l_mg->data_line = line;
>  	list_del(&line->list);
> -	spin_unlock(&l_mg->free_lock);
>
>  	ret = pblk_line_prepare(pblk, line);
>  	if (ret) {
>  		list_add(&line->list, &l_mg->free_list);
> +		spin_unlock(&l_mg->free_lock);
>  		return ret;
>  	}
> +	spin_unlock(&l_mg->free_lock);
>
>  	pblk_rl_free_lines_dec(&pblk->rl, line);
>
> @@ -1140,6 +1141,7 @@ static struct pblk_line *pblk_line_retry(struct pblk *pblk,
>  	line->invalid_bitmap = NULL;
>  	line->smeta = NULL;
>  	line->emeta = NULL;
> +	l_mg->data_line = retry_line;
>  	spin_unlock(&l_mg->free_lock);
>
>  	if (pblk_line_erase(pblk, retry_line))
> @@ -1147,8 +1149,6 @@ static struct pblk_line *pblk_line_retry(struct pblk *pblk,
>
>  	pblk_rl_free_lines_dec(&pblk->rl, retry_line);
>
> -	l_mg->data_line = retry_line;
> -
>  	return retry_line;
>  }
>
>

Reviewed-by: Matias Bjørling <matias@...xlabs.com>