linux-kernel - Re: [PATCH 2/5] block: rsxx: core: simplify ida usage

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Message-ID: <mqdy4fl7f0h.fsf@c203.arch.suse.de>
Date:	Fri, 02 Oct 2015 12:15:26 +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>,
	Joshua Morris <josh.h.morris@...ibm.com>,
	Philip Kelleher <pjk1939@...ux.vnet.ibm.com>
Subject: Re: [PATCH 2/5] block: rsxx: core: 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/rsxx/core.c | 20 ++++----------------
>  1 file changed, 4 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/block/rsxx/core.c b/drivers/block/rsxx/core.c
> index d8b2488aaade..d2279a759b2e 100644
> --- a/drivers/block/rsxx/core.c
> +++ b/drivers/block/rsxx/core.c
> @@ -58,7 +58,6 @@ MODULE_PARM_DESC(sync_start, "On by Default: Driver load will not complete "
>  			     "until the card startup has completed.");
>  
>  static DEFINE_IDA(rsxx_disk_ida);
> -static DEFINE_SPINLOCK(rsxx_ida_lock);
>  
>  /* --------------------Debugfs Setup ------------------- */
>  
> @@ -774,19 +773,10 @@ static int rsxx_pci_probe(struct pci_dev *dev,
>  	card->dev = dev;
>  	pci_set_drvdata(dev, card);
>  
> -	do {
> -		if (!ida_pre_get(&rsxx_disk_ida, GFP_KERNEL)) {
> -			st = -ENOMEM;
> -			goto failed_ida_get;
> -		}
> -
> -		spin_lock(&rsxx_ida_lock);
> -		st = ida_get_new(&rsxx_disk_ida, &card->disk_id);
> -		spin_unlock(&rsxx_ida_lock);
> -	} while (st == -EAGAIN);
> -
> -	if (st)
> +	st = ida_simple_get(&rsxx_disk_ida, 0, 0, GFP_KERNEL);
> +	if (st < 0)
>  		goto failed_ida_get;
> +	card->disk_id = st;
>  
>  	st = pci_enable_device(dev);
>  	if (st)
> @@ -987,9 +977,7 @@ failed_request_regions:
>  failed_dma_mask:
>  	pci_disable_device(dev);
>  failed_enable:
> -	spin_lock(&rsxx_ida_lock);
> -	ida_remove(&rsxx_disk_ida, card->disk_id);
> -	spin_unlock(&rsxx_ida_lock);
> +	ida_simple_remove(&rsxx_disk_ida, card->disk_id);
>  failed_ida_get:
>  	kfree(card);

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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