linux-kernel - Re: [PATCH] bcache: explicitly destory mutex while exiting

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Message-ID: <823fcdcf-893e-edc7-62c2-585db7f868ed@coly.li>
Date:   Thu, 4 May 2017 21:59:41 +0800
From:   Coly Li <i@...y.li>
To:     Liang Chen <liangchen.linux@...il.com>,
        linux-bcache@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, colyli@...e.de,
        bcache@...ux.ewheeler.net
Subject: Re: [PATCH] bcache: explicitly destory mutex while exiting

On 2017/5/2 下午4:09, Liang Chen wrote:
> mutex_destroy does nothing most of time, but it's better to call
> it to make the code future proof and it also has some meaning
> for like mutex debug.
> 

Hi Liang,

Could you please explain a little bit more about how mutex_destroy()
helps to future proof of the code, and how it helps to mutex debug ?

Forgive me for not catching your point.

Thanks.


> Signed-off-by: Liang Chen <liangchen.linux@...il.com>
> ---
>  drivers/md/bcache/super.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
> index 85e3f21..406fe03 100644
> --- a/drivers/md/bcache/super.c
> +++ b/drivers/md/bcache/super.c
> @@ -2083,6 +2083,7 @@ static void bcache_exit(void)
>  	if (bcache_major)
>  		unregister_blkdev(bcache_major, "bcache");
>  	unregister_reboot_notifier(&reboot);
> +	mutex_destroy(&bch_register_lock);
>  }
>  
>  static int __init bcache_init(void)
> @@ -2100,6 +2101,7 @@ static int __init bcache_init(void)
>  
>  	bcache_major = register_blkdev(0, "bcache");
>  	if (bcache_major < 0) {
> +		mutex_destroy(&bch_register_lock);
>  		unregister_reboot_notifier(&reboot);
>  		return bcache_major;
>  	}
> 


-- 
Coly Li