linux-kernel - Re: [PATCH 6/6] lightnvm: pblk: fix releases of kmem cache in error path

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Date:   Mon, 2 Oct 2017 14:44:23 +0200
From:   Javier González <jg@...htnvm.io>
To:     Rakesh Pandit <rakesh@...era.com>
Cc:     Matias Bjørling <mb@...htnvm.io>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] lightnvm: pblk: fix releases of kmem cache in error
 path

> On 1 Oct 2017, at 15.26, Rakesh Pandit <rakesh@...era.com> wrote:
> 
> If pblk_core_init fails lets destroy all global caches.
> 
> Signed-off-by: Rakesh Pandit <rakesh@...era.com>
> ---
> drivers/lightnvm/pblk-init.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
> index 519e5cf..9f39800 100644
> --- a/drivers/lightnvm/pblk-init.c
> +++ b/drivers/lightnvm/pblk-init.c
> @@ -246,7 +246,7 @@ static int pblk_core_init(struct pblk *pblk)
> 	pblk->page_bio_pool = mempool_create_page_pool(nvm_max_phys_sects(dev),
> 									0);
> 	if (!pblk->page_bio_pool)
> -		return -ENOMEM;
> +		goto free_global_caches;
> 
> 	pblk->gen_ws_pool = mempool_create_slab_pool(PBLK_GEN_WS_POOL_SIZE,
> 							pblk_ws_cache);
> @@ -314,6 +314,12 @@ static int pblk_core_init(struct pblk *pblk)
> 	mempool_destroy(pblk->gen_ws_pool);
> free_page_bio_pool:
> 	mempool_destroy(pblk->page_bio_pool);
> +free_global_caches:
> +	kmem_cache_destroy(pblk_ws_cache);
> +	kmem_cache_destroy(pblk_rec_cache);
> +	kmem_cache_destroy(pblk_g_rq_cache);
> +	kmem_cache_destroy(pblk_e_rq_cache);
> +	kmem_cache_destroy(pblk_w_rq_cache);
> 	return -ENOMEM;
> }
> 
> --
> 2.7.4

Looks good. I'll refactor it on a single function so that we can reuse
it on tear down. It will also be simpler to add/remove caches in the
future.

Since it depends on the last patch, I'll wait until you reply to it
before making the changes.

Javier

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