linux-kernel - Re: [PATCH] SCSI-zfcp: Delete unnecessary checks before the function call "mempool

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Date:	Thu, 14 Jan 2016 15:56:05 +0100
From:	Steffen Maier <maier@...ux.vnet.ibm.com>
To:	Benjamin Block <bblock@...ux.vnet.ibm.com>,
	SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-s390@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] SCSI-zfcp: Delete unnecessary checks before the function
 call "mempool_destroy"

Markus, thanks, I queued it for next time I send features upstream.
Don't hold your breath, fixes will go first.

Benjamin, thanks for the review.

Will add an informational comment that this depends on 4e3ca3e033d1 
("mm/mempool: allow NULL `pool' pointer in mempool_destroy()").

On 12/04/2015 06:57 PM, Benjamin Block wrote:
> Hej Markus,
>
> On 14:23 Mon 16 Nov     , SF Markus Elfring wrote:
>> From: Markus Elfring <elfring@...rs.sourceforge.net>
>> Date: Mon, 16 Nov 2015 14:19:03 +0100
>>
>> The mempool_destroy() function tests whether its argument is NULL
>> and then returns immediately. Thus the test around the calls is not needed.
>>
>> This issue was detected by using the Coccinelle software.
>>
>> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
>> ---
>>   drivers/s390/scsi/zfcp_aux.c | 21 +++++++--------------
>>   1 file changed, 7 insertions(+), 14 deletions(-)
>>
>> diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c
>> index c00ac46..abc9c93 100644
>> --- a/drivers/s390/scsi/zfcp_aux.c
>> +++ b/drivers/s390/scsi/zfcp_aux.c
>> @@ -248,20 +248,13 @@ static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
>>
>>   static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
>>   {
>> -	if (adapter->pool.erp_req)
>> -		mempool_destroy(adapter->pool.erp_req);
>> -	if (adapter->pool.scsi_req)
>> -		mempool_destroy(adapter->pool.scsi_req);
>> -	if (adapter->pool.scsi_abort)
>> -		mempool_destroy(adapter->pool.scsi_abort);
>> -	if (adapter->pool.qtcb_pool)
>> -		mempool_destroy(adapter->pool.qtcb_pool);
>> -	if (adapter->pool.status_read_req)
>> -		mempool_destroy(adapter->pool.status_read_req);
>> -	if (adapter->pool.sr_data)
>> -		mempool_destroy(adapter->pool.sr_data);
>> -	if (adapter->pool.gid_pn)
>> -		mempool_destroy(adapter->pool.gid_pn);
>> +	mempool_destroy(adapter->pool.erp_req);
>> +	mempool_destroy(adapter->pool.scsi_req);
>> +	mempool_destroy(adapter->pool.scsi_abort);
>> +	mempool_destroy(adapter->pool.qtcb_pool);
>> +	mempool_destroy(adapter->pool.status_read_req);
>> +	mempool_destroy(adapter->pool.sr_data);
>> +	mempool_destroy(adapter->pool.gid_pn);
>>   }
>>
>>   /**
>> --
>> 2.6.2
>
> Looks good to me, will have to wait though till Steffen is back around.
>
> Reviewed-by: Benjamin Block <bblock@...ux.vnet.ibm.com>
>
>
>                                                      Beste Grüße / Best regards,
>                                                        - Benjamin Block
>

-- 
Mit freundlichen Grüßen / Kind regards
Steffen Maier

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