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

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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@xxxxxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxxxx>
---
  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@xxxxxxxxxxxxxxxxxx>


                                                     Beste Grüße / Best regards,
                                                       - Benjamin Block


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Mit freundlichen Grüßen / Kind regards
Steffen Maier

Linux on z Systems Development

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