linux-kernel - Re: [PATCH] null_blk: Fix error path in module initialization

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Date:	Tue, 8 Dec 2015 20:35:43 +0800
From:	Minfei Huang <mnfhuang@...il.com>
To:	Minfei Huang <mhuang@...hat.com>
Cc:	axboe@...com, m@...rling.me, akinobu.mita@...il.com,
	rusty@...tcorp.com.au, keith.busch@...el.com, mcgrof@...e.com,
	krinkin.m.u@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] null_blk: Fix error path in module initialization

Ping.

Any comment is appreciate.

Thanks
Minfei

On 11/26/15 at 09:48P, Minfei Huang wrote:
> From: Minfei Huang <mnfhuang@...il.com>
> 
> Module couldn't release resource properly during the initialization. To
> fix this issue, we will clean up the proper resource before returning.
> 
> Signed-off-by: Minfei Huang <mnfhuang@...il.com>
> ---
>  drivers/block/null_blk.c | 24 +++++++++++++++++-------
>  1 file changed, 17 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
> index 5c8ba54..ec99568 100644
> --- a/drivers/block/null_blk.c
> +++ b/drivers/block/null_blk.c
> @@ -780,7 +780,9 @@ out:
>  
>  static int __init null_init(void)
>  {
> +	int ret = 0;
>  	unsigned int i;
> +	struct nullb *nullb;
>  
>  	if (bs > PAGE_SIZE) {
>  		pr_warn("null_blk: invalid block size\n");
> @@ -835,22 +837,30 @@ static int __init null_init(void)
>  								0, 0, NULL);
>  		if (!ppa_cache) {
>  			pr_err("null_blk: unable to create ppa cache\n");
> -			return -ENOMEM;
> +			ret = -ENOMEM;
> +			goto err_ppa;
>  		}
>  	}
>  
>  	for (i = 0; i < nr_devices; i++) {
> -		if (null_add_dev()) {
> -			unregister_blkdev(null_major, "nullb");
> -			goto err_ppa;
> -		}
> +		ret = null_add_dev();
> +		if (ret)
> +			goto err_dev;
>  	}
>  
>  	pr_info("null: module loaded\n");
>  	return 0;
> +
> +err_dev:
> +	while (!list_empty(&nullb_list)) {
> +		nullb = list_entry(nullb_list.next, struct nullb, list);
> +		null_del_dev(nullb);
> +	}
> +	if (use_lightnvm)
> +		kmem_cache_destroy(ppa_cache);
>  err_ppa:
> -	kmem_cache_destroy(ppa_cache);
> -	return -EINVAL;
> +	unregister_blkdev(null_major, "nullb");
> +	return ret;
>  }
>  
>  static void __exit null_exit(void)
> -- 
> 1.8.3.1
> 
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