linux-kernel - Re: [PATCH] s390: zfcp_aux: remove unnecessary null pointer check before mempool

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Date:   Mon, 10 Sep 2018 08:23:00 +0200
From:   Benjamin Block <bblock@...ux.ibm.com>
To:     zhong jiang <zhongjiang@...wei.com>
Cc:     maier@...ux.ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] s390: zfcp_aux: remove unnecessary null pointer check
 before mempool_destroy

On Sat, Sep 08, 2018 at 05:41:45PM +0800, zhong jiang wrote:
> mempool_destroy has taken null pointer check into account. so remove the
> redundant check.
> 
> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
> ---
>  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 94f4d8f..e06c3f2 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);
>  }
>  

Acked-by: Benjamin Block <bblock@...ux.ibm.com>

Thank you. We'll send it along when we next send patches upstream.

--
With Best Regards, Benjamin Block      /      Linux on IBM Z Kernel Development
IBM Systems & Technology Group   /  IBM Deutschland Research & Development GmbH
Vorsitz. AufsR.: Martina Koederitz       /      Geschäftsführung: Dirk Wittkopp
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