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

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Message-ID: <4E2D4E3B.4050407@cam.ac.uk>
Date:	Mon, 25 Jul 2011 12:06:35 +0100
From:	Jonathan Cameron <jic23@....ac.uk>
To:	Boaz Harrosh <bharrosh@...asas.com>
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 07/22/11 22:47, Boaz Harrosh wrote:
> 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.
Cool, I've scrapped the error mangling and added your acked-by
+ removed questions from commit message as you've answered them!

Thanks,

> 
>> 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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