linux-kernel - Re: [PATCH 17/39] md: drop null test before destroy functions

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Date:	Tue, 15 Sep 2015 09:29:10 +0200
From:	Neil Brown <neilb@...e.com>
To:	Julia Lawall <Julia.Lawall@...6.fr>
Cc:	sergey.senozhatsky@...il.com, kernel-janitors@...r.kernel.org,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 17/39] md: drop null test before destroy functions

Julia Lawall <Julia.Lawall@...6.fr> writes:

> Remove unneeded NULL test.
>
> The semantic patch that makes this change is as follows:
> (http://coccinelle.lip6.fr/)
>
> // <smpl>
> @@ expression x; @@
> -if (x != NULL)
>   \(kmem_cache_destroy\|mempool_destroy\|dma_pool_destroy\)(x);
> // </smpl>
>
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
>
> ---
>  drivers/md/multipath.c |    3 +--
>  drivers/md/raid1.c     |    6 ++----
>  drivers/md/raid10.c    |    9 +++------
>  drivers/md/raid5.c     |    3 +--
>  4 files changed, 7 insertions(+), 14 deletions(-)

Applied, thanks.

NeilBrown


>
> diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
> index 15ef2c6..09a12d7 100644
> --- a/drivers/md/raid5.c
> +++ b/drivers/md/raid5.c
> @@ -2271,8 +2271,7 @@ static void shrink_stripes(struct r5conf *conf)
>  	       drop_one_stripe(conf))
>  		;
>  
> -	if (conf->slab_cache)
> -		kmem_cache_destroy(conf->slab_cache);
> +	kmem_cache_destroy(conf->slab_cache);
>  	conf->slab_cache = NULL;
>  }
>  
> diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
> index 4517f06..5f4f553 100644
> --- a/drivers/md/raid1.c
> +++ b/drivers/md/raid1.c
> @@ -2843,8 +2843,7 @@ static struct r1conf *setup_conf(struct mddev *mddev)
>  
>   abort:
>  	if (conf) {
> -		if (conf->r1bio_pool)
> -			mempool_destroy(conf->r1bio_pool);
> +		mempool_destroy(conf->r1bio_pool);
>  		kfree(conf->mirrors);
>  		safe_put_page(conf->tmppage);
>  		kfree(conf->poolinfo);
> @@ -2946,8 +2945,7 @@ static void raid1_free(struct mddev *mddev, void *priv)
>  {
>  	struct r1conf *conf = priv;
>  
> -	if (conf->r1bio_pool)
> -		mempool_destroy(conf->r1bio_pool);
> +	mempool_destroy(conf->r1bio_pool);
>  	kfree(conf->mirrors);
>  	safe_put_page(conf->tmppage);
>  	kfree(conf->poolinfo);
> diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
> index d222522..d132f06 100644
> --- a/drivers/md/multipath.c
> +++ b/drivers/md/multipath.c
> @@ -470,8 +470,7 @@ static int multipath_run (struct mddev *mddev)
>  	return 0;
>  
>  out_free_conf:
> -	if (conf->pool)
> -		mempool_destroy(conf->pool);
> +	mempool_destroy(conf->pool);
>  	kfree(conf->multipaths);
>  	kfree(conf);
>  	mddev->private = NULL;
> diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
> index 0fc33eb..7c99a40 100644
> --- a/drivers/md/raid10.c
> +++ b/drivers/md/raid10.c
> @@ -3486,8 +3486,7 @@ static struct r10conf *setup_conf(struct mddev *mddev)
>  		printk(KERN_ERR "md/raid10:%s: couldn't allocate memory.\n",
>  		       mdname(mddev));
>  	if (conf) {
> -		if (conf->r10bio_pool)
> -			mempool_destroy(conf->r10bio_pool);
> +		mempool_destroy(conf->r10bio_pool);
>  		kfree(conf->mirrors);
>  		safe_put_page(conf->tmppage);
>  		kfree(conf);
> @@ -3682,8 +3681,7 @@ static int run(struct mddev *mddev)
>  
>  out_free_conf:
>  	md_unregister_thread(&mddev->thread);
> -	if (conf->r10bio_pool)
> -		mempool_destroy(conf->r10bio_pool);
> +	mempool_destroy(conf->r10bio_pool);
>  	safe_put_page(conf->tmppage);
>  	kfree(conf->mirrors);
>  	kfree(conf);
> @@ -3696,8 +3694,7 @@ static void raid10_free(struct mddev *mddev, void *priv)
>  {
>  	struct r10conf *conf = priv;
>  
> -	if (conf->r10bio_pool)
> -		mempool_destroy(conf->r10bio_pool);
> +	mempool_destroy(conf->r10bio_pool);
>  	safe_put_page(conf->tmppage);
>  	kfree(conf->mirrors);
>  	kfree(conf->mirrors_old);

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