linux-kernel - Re: [PATCH 2/2] null_blk: Do a cleanup for function null_add

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Date:	Mon, 14 Dec 2015 19:43:35 +0800
From:	Minfei Huang <mhuang@...hat.com>
To:	Minfei Huang <mnfhuang@...il.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 2/2] null_blk: Do a cleanup for function null_add_dev

Ping, Jens.

Could you have any idea about this cleanup patch?

Thanks
Minfei

On 11/27/15 at 09:26pm, Minfei Huang wrote:
> If null block is a lightnvm device, it wouldn't need to allocate the
> variant disk. So it is fine to separate the code for lightnvm and normal
> device to use if/else.
> 
> Thus we don't never need the flag out_cleanup_lightnvm.
> 
> Signed-off-by: Minfei Huang <mnfhuang@...il.com>
> ---
>  drivers/block/null_blk.c | 42 +++++++++++++++++++-----------------------
>  1 file changed, 19 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
> index 729ecd7..7d5d2e7 100644
> --- a/drivers/block/null_blk.c
> +++ b/drivers/block/null_blk.c
> @@ -739,32 +739,28 @@ static int null_add_dev(void)
>  							&null_lnvm_dev_ops);
>  		if (rv)
>  			goto out_cleanup_blk_list;
> -		goto done;
> -	}
> -
> -	disk = nullb->disk = alloc_disk_node(1, home_node);
> -	if (!disk) {
> -		rv = -ENOMEM;
> -		goto out_cleanup_lightnvm;
> +	} else {
> +		disk = nullb->disk = alloc_disk_node(1, home_node);
> +		if (!disk) {
> +			rv = -ENOMEM;
> +			goto out_cleanup_blk_list;
> +		}
> +		size = gb * 1024 * 1024 * 1024ULL;
> +		set_capacity(disk, size >> 9);
> +
> +		disk->flags |=
> +			GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO;
> +		disk->major		= null_major;
> +		disk->first_minor	= nullb->index;
> +		disk->fops		= &null_fops;
> +		disk->private_data	= nullb;
> +		disk->queue		= nullb->q;
> +		strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN);
> +
> +		add_disk(disk);
>  	}
> -	size = gb * 1024 * 1024 * 1024ULL;
> -	set_capacity(disk, size >> 9);
> -
> -	disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO;
> -	disk->major		= null_major;
> -	disk->first_minor	= nullb->index;
> -	disk->fops		= &null_fops;
> -	disk->private_data	= nullb;
> -	disk->queue		= nullb->q;
> -	strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN);
> -
> -	add_disk(disk);
> -done:
>  	return 0;
>  
> -out_cleanup_lightnvm:
> -	if (use_lightnvm)
> -		nvm_unregister(nullb->disk_name);
>  out_cleanup_blk_list:
>  	mutex_lock(&lock);
>  	list_del_init(&nullb->list);
> -- 
> 1.8.3.1
> 
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