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Date:   Mon, 5 Feb 2018 09:00:06 -0800
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Wang Long <wanglong19@...tuan.com>
Cc:     tytso@....edu, jack@...e.com, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] jbd2: set to NULL after kmem_cache_destroy

On Mon, Feb 05, 2018 at 09:39:17PM +0800, Wang Long wrote:
> Signed-off-by: Wang Long <wanglong19@...tuan.com>
> ---
>  fs/jbd2/journal.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> index 93016bb..38dc24c 100644
> --- a/fs/jbd2/journal.c
> +++ b/fs/jbd2/journal.c
> @@ -2649,11 +2649,14 @@ static int __init jbd2_journal_init_handle_cache(void)
>  
>  static void jbd2_journal_destroy_handle_cache(void)
>  {
> -	if (jbd2_handle_cache)
> +	if (jbd2_handle_cache) {
>  		kmem_cache_destroy(jbd2_handle_cache);

kmem_cache_destroy already handles null pointers, so you can remove the
conditional test entirely.

--D

> -	if (jbd2_inode_cache)
> +		jbd2_handle_cache = NULL;
> +	}
> +	if (jbd2_inode_cache) {
>  		kmem_cache_destroy(jbd2_inode_cache);
> -
> +		jbd2_inode_cache = NULL;
> +	}
>  }
>  
>  /*
> -- 
> 1.8.3.1
> 

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