linux-kernel - Re: [osd-dev] [PATCH 6/8] [SCSI] osduld: use ida_simple

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Date:	Fri, 22 Jul 2011 14:47:06 -0700
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Jonathan Cameron <jic23@....ac.uk>
CC:	<linux-kernel@...r.kernel.org>, <randy.dunlap@...cle.com>,
	<airlied@...ux.ie>, <dri-devel@...ts.freedesktop.org>,
	<guenter.roeck@...csson.com>, <johnpol@....mipt.ru>,
	<thellstrom@...are.com>, <linux-scsi@...r.kernel.org>,
	<JBottomley@...allels.com>, <lm-sensors@...sensors.org>,
	<airlied@...hat.com>, <paulmck@...ux.vnet.ibm.com>,
	<naota@...sp.net>, <rtc-linux@...glegroups.com>,
	<namhyung@...il.com>, <rusty@...tcorp.com.au>,
	<khali@...ux-fr.org>, <osd-dev@...n-osd.org>,
	<akpm@...ux-foundation.org>, <a.zummo@...ertech.it>,
	<jkosina@...e.cz>, <cabarnes@...esign-llc.com>, <tj@...nel.org>,
	<bhalevy@...asas.com>
Subject: Re: [osd-dev] [PATCH 6/8] [SCSI] osduld: use ida_simple_get to handle
 id.

On 07/22/2011 09:41 AM, Jonathan Cameron wrote:
> This does involve additional use of the spin lock in idr.c.
> Is this an issue?
> 

Actually it looks like a bug fix. I had a TODO: to add one.

> Also, some error mangling was needed to keep the interface
> the same.  Does this matter or can we return -ENOSPC instead
> of -EBUSY?
> 

Na. -ENOSPC is just fine. All the osd Application just check for
"any error" not a specific one.

> Signed-off-by: Jonathan Cameron <jic23@....ac.uk>

Ack-by: Boaz Harrosh <bharrosh@...asas.com>

> ---
>  drivers/scsi/osd/osd_uld.c |   22 ++++++++--------------
>  1 files changed, 8 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/scsi/osd/osd_uld.c b/drivers/scsi/osd/osd_uld.c
> index b31a8e3..fa849bd 100644
> --- a/drivers/scsi/osd/osd_uld.c
> +++ b/drivers/scsi/osd/osd_uld.c
> @@ -387,7 +387,7 @@ static void __remove(struct device *dev)
>  
>  	if (oud->disk)
>  		put_disk(oud->disk);
> -	ida_remove(&osd_minor_ida, oud->minor);
> +	ida_simple_remove(&osd_minor_ida, oud->minor);
>  
>  	kfree(oud);
>  }
> @@ -403,18 +403,12 @@ static int osd_probe(struct device *dev)
>  	if (scsi_device->type != TYPE_OSD)
>  		return -ENODEV;
>  
> -	do {
> -		if (!ida_pre_get(&osd_minor_ida, GFP_KERNEL))
> -			return -ENODEV;
> -
> -		error = ida_get_new(&osd_minor_ida, &minor);
> -	} while (error == -EAGAIN);
> -
> -	if (error)
> -		return error;
> -	if (minor >= SCSI_OSD_MAX_MINOR) {
> -		error = -EBUSY;
> -		goto err_retract_minor;
> +	minor = ida_simple_get(&osd_minor_ida, 0,
> +			       SCSI_OSD_MAX_MINOR, GFP_KERNEL);
> +	if (minor < 0) {
> +		if (minor == -ENOSPC)
> +			return -EBUSY;

Just drop the translation is fine as well

> +		return minor;
>  	}
>  
>  	error = -ENOMEM;
> @@ -491,7 +485,7 @@ err_free_osd:
>  	dev_set_drvdata(dev, NULL);
>  	kfree(oud);
>  err_retract_minor:
> -	ida_remove(&osd_minor_ida, minor);
> +	ida_simple_remove(&osd_minor_ida, minor);
>  	return error;
>  }
>  

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