linux-kernel - Re: [PATCH 4/5] block: mtip32xx: simplify ida usage

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Date:	Fri, 02 Oct 2015 12:16:04 +0200
From:	Johannes Thumshirn <jthumshirn@...e.de>
To:	Lee Duncan <lduncan@...e.com>
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Tejun Heo <tj@...nel.org>, Hannes Reinecke <hare@...e.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 4/5] block: mtip32xx: simplify ida usage

Lee Duncan <lduncan@...e.com> writes:

> Simplify ida index allocation and removal by
> using the ida_simple_* helper functions
>
> Signed-off-by: Lee Duncan <lduncan@...e.com>
> ---
>  drivers/block/mtip32xx/mtip32xx.c | 26 ++++++--------------------
>  1 file changed, 6 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
> index 4a2ef09e6704..e62d170b0641 100644
> --- a/drivers/block/mtip32xx/mtip32xx.c
> +++ b/drivers/block/mtip32xx/mtip32xx.c
> @@ -118,7 +118,6 @@ static struct dentry *dfs_device_status;
>  
>  static u32 cpu_use[NR_CPUS];
>  
> -static DEFINE_SPINLOCK(rssd_index_lock);
>  static DEFINE_IDA(rssd_index_ida);
>  
>  static int mtip_block_initialize(struct driver_data *dd);
> @@ -3821,17 +3820,10 @@ static int mtip_block_initialize(struct driver_data *dd)
>  	}
>  
>  	/* Generate the disk name, implemented same as in sd.c */
> -	do {
> -		if (!ida_pre_get(&rssd_index_ida, GFP_KERNEL))
> -			goto ida_get_error;
> -
> -		spin_lock(&rssd_index_lock);
> -		rv = ida_get_new(&rssd_index_ida, &index);
> -		spin_unlock(&rssd_index_lock);
> -	} while (rv == -EAGAIN);
> -
> -	if (rv)
> +	rv = ida_simple_get(&rssd_index_ida, 0, 0, GFP_KERNEL);
> +	if (rv < 0)
>  		goto ida_get_error;
> +	index = rv;
>  
>  	rv = rssd_disk_name_format("rssd",
>  				index,
> @@ -3981,9 +3973,7 @@ init_hw_cmds_error:
>  block_queue_alloc_init_error:
>  	mtip_hw_debugfs_exit(dd);
>  disk_index_error:
> -	spin_lock(&rssd_index_lock);
> -	ida_remove(&rssd_index_ida, index);
> -	spin_unlock(&rssd_index_lock);
> +	ida_simple_remove(&rssd_index_ida, index);
>  
>  ida_get_error:
>  	put_disk(dd->disk);
> @@ -4051,9 +4041,7 @@ static int mtip_block_remove(struct driver_data *dd)
>  	}
>  	dd->disk  = NULL;
>  
> -	spin_lock(&rssd_index_lock);
> -	ida_remove(&rssd_index_ida, dd->index);
> -	spin_unlock(&rssd_index_lock);
> +	ida_simple_remove(&rssd_index_ida, dd->index);
>  
>  	/* De-initialize the protocol layer. */
>  	mtip_hw_exit(dd);
> @@ -4092,9 +4080,7 @@ static int mtip_block_shutdown(struct driver_data *dd)
>  		dd->queue = NULL;
>  	}
>  
> -	spin_lock(&rssd_index_lock);
> -	ida_remove(&rssd_index_ida, dd->index);
> -	spin_unlock(&rssd_index_lock);
> +	ida_simple_remove(&rssd_index_ida, dd->index);
>  	return 0;
>  }

Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>

-- 
Johannes Thumshirn                                          Storage
jthumshirn@...e.de                                +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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