linux-kernel - Re: [PATCH 5/5] base: soc: siplify ida usage

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Date:	Fri, 02 Oct 2015 12:16:19 +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>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 5/5] base: soc: siplify 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/base/soc.c | 21 +++++----------------
>  1 file changed, 5 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/base/soc.c b/drivers/base/soc.c
> index 39fca01c8fa1..75b98aad6faf 100644
> --- a/drivers/base/soc.c
> +++ b/drivers/base/soc.c
> @@ -16,7 +16,6 @@
>  #include <linux/err.h>
>  
>  static DEFINE_IDA(soc_ida);
> -static DEFINE_SPINLOCK(soc_lock);
>  
>  static ssize_t soc_info_get(struct device *dev,
>  			    struct device_attribute *attr,
> @@ -122,20 +121,10 @@ struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr
>  	}
>  
>  	/* Fetch a unique (reclaimable) SOC ID. */
> -	do {
> -		if (!ida_pre_get(&soc_ida, GFP_KERNEL)) {
> -			ret = -ENOMEM;
> -			goto out2;
> -		}
> -
> -		spin_lock(&soc_lock);
> -		ret = ida_get_new(&soc_ida, &soc_dev->soc_dev_num);
> -		spin_unlock(&soc_lock);
> -
> -	} while (ret == -EAGAIN);
> -
> -	if (ret)
> +	ret = ida_simple_get(&soc_ida, 0, 0, GFP_KERNEL);
> +	if (ret < 0)
>  		goto out2;
> +	soc_dev->soc_dev_num = ret;
>  
>  	soc_dev->attr = soc_dev_attr;
>  	soc_dev->dev.bus = &soc_bus_type;
> @@ -151,7 +140,7 @@ struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr
>  	return soc_dev;
>  
>  out3:
> -	ida_remove(&soc_ida, soc_dev->soc_dev_num);
> +	ida_simple_remove(&soc_ida, soc_dev->soc_dev_num);
>  out2:
>  	kfree(soc_dev);
>  out1:
> @@ -161,7 +150,7 @@ out1:
>  /* Ensure soc_dev->attr is freed prior to calling soc_device_unregister. */
>  void soc_device_unregister(struct soc_device *soc_dev)
>  {
> -	ida_remove(&soc_ida, soc_dev->soc_dev_num);
> +	ida_simple_remove(&soc_ida, soc_dev->soc_dev_num);
>  
>  	device_unregister(&soc_dev->dev);
>  }

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

-- 
Johannes Thumshirn                                          Storage
jthumshirn@...e.de                                +49 911 74053 689
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