linux-kernel - Re: [PATCH 1/9] lightnvm: pblk: prevent gc kicks when gc is not operational

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Message-Id: <4A687BD0-20E5-40F7-BEE7-802F722565C7@lightnvm.io>
Date:   Tue, 3 Oct 2017 12:27:17 +0200
From:   Javier González <jg@...htnvm.io>
To:     Hans Holmberg <hans.ml.holmberg@...tronix.com>
Cc:     Matias Bjørling <mb@...htnvm.io>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hans Holmberg <hans.holmberg@...xlabs.com>
Subject: Re: [PATCH 1/9] lightnvm: pblk: prevent gc kicks when gc is not
 operational

> On 3 Oct 2017, at 12.05, Hans Holmberg <hans.ml.holmberg@...tronix.com> wrote:
> 
> From: Hans Holmberg <hans.holmberg@...xlabs.com>
> 
> GC can be kicked after it has been shut down when closing the last
> line during exit, resulting in accesses to freed structures.
> 
> Make sure that GC is not triggered while it is not operational.
> Also make sure that GC won't be re-activated during exit when
> running on another processor by using timer_del_sync.
> 
> Signed-off-by: Hans Holmberg <hans.holmberg@...xlabs.com>
> ---
> drivers/lightnvm/pblk-gc.c   | 9 +++++----
> drivers/lightnvm/pblk-init.c | 1 +
> 2 files changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/lightnvm/pblk-gc.c b/drivers/lightnvm/pblk-gc.c
> index 7b103bc..81efac1 100644
> --- a/drivers/lightnvm/pblk-gc.c
> +++ b/drivers/lightnvm/pblk-gc.c
> @@ -478,10 +478,10 @@ void pblk_gc_should_start(struct pblk *pblk)
> {
> 	struct pblk_gc *gc = &pblk->gc;
> 
> -	if (gc->gc_enabled && !gc->gc_active)
> +	if (gc->gc_enabled && !gc->gc_active) {
> 		pblk_gc_start(pblk);
> -
> -	pblk_gc_kick(pblk);
> +		pblk_gc_kick(pblk);
> +	}
> }
> 
> /*
> @@ -620,7 +620,8 @@ void pblk_gc_exit(struct pblk *pblk)
> 	flush_workqueue(gc->gc_reader_wq);
> 	flush_workqueue(gc->gc_line_reader_wq);
> 
> -	del_timer(&gc->gc_timer);
> +	gc->gc_enabled = 0;
> +	del_timer_sync(&gc->gc_timer);
> 	pblk_gc_stop(pblk, 1);
> 
> 	if (gc->gc_ts)
> diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
> index 0163914..ec7974b 100644
> --- a/drivers/lightnvm/pblk-init.c
> +++ b/drivers/lightnvm/pblk-init.c
> @@ -928,6 +928,7 @@ static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
> 	pblk->dev = dev;
> 	pblk->disk = tdisk;
> 	pblk->state = PBLK_STATE_RUNNING;
> +	pblk->gc.gc_enabled = 0;
> 
> 	spin_lock_init(&pblk->trans_lock);
> 	spin_lock_init(&pblk->lock);
> --
> 2.7.4

LGTM.

Reviewed-by: Javier González <javier@...xlabs.com>


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