linux-kernel - [PATCH] scsi: megaraid: fix ifnullfree.cocci warnings

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Message-ID: <20170725154005.GA50458@lkp-hsx03.lkp.intel.com>
Date:   Tue, 25 Jul 2017 23:40:05 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Romain Perier <romain.perier@...labora.com>
Cc:     kbuild-all@...org,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Peter Senna Tschudin <peter.senna@...labora.com>,
        Kashyap Desai <kashyap.desai@...adcom.com>,
        Sumit Saxena <sumit.saxena@...adcom.com>,
        Shivasharan S <shivasharan.srikanteshwara@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        megaraidlinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: megaraid: fix ifnullfree.cocci warnings

drivers/scsi/megaraid/megaraid_mbox.c:1256:2-18: WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values.
drivers/scsi/megaraid/megaraid_mbox.c:1265:2-18: WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values.
drivers/scsi/megaraid/megaraid_mbox.c:1274:2-18: WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values.

 NULL check before some freeing functions is not needed.

 Based on checkpatch warning
 "kfree(NULL) is safe this check is probably not required"
 and kfreeaddr.cocci by Julia Lawall.

Generated by: scripts/coccinelle/free/ifnullfree.cocci

Fixes: cbb80044a6c7 ("scsi: megaraid: Replace PCI pool old API")
CC: Romain Perier <romain.perier@...labora.com>
Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
---

 megaraid_mbox.c |    9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

--- a/drivers/scsi/megaraid/megaraid_mbox.c
+++ b/drivers/scsi/megaraid/megaraid_mbox.c
@@ -1252,8 +1252,7 @@ megaraid_mbox_teardown_dma_pools(adapter
 		dma_pool_free(raid_dev->sg_pool_handle, sg_pci_blk[i].vaddr,
 			sg_pci_blk[i].dma_addr);
 	}
-	if (raid_dev->sg_pool_handle)
-		dma_pool_destroy(raid_dev->sg_pool_handle);
+	dma_pool_destroy(raid_dev->sg_pool_handle);

 	epthru_pci_blk = raid_dev->epthru_pool;
@@ -1261,8 +1260,7 @@ megaraid_mbox_teardown_dma_pools(adapter
 		dma_pool_free(raid_dev->epthru_pool_handle,
 			epthru_pci_blk[i].vaddr, epthru_pci_blk[i].dma_addr);
 	}
-	if (raid_dev->epthru_pool_handle)
-		dma_pool_destroy(raid_dev->epthru_pool_handle);
+	dma_pool_destroy(raid_dev->epthru_pool_handle);

 	mbox_pci_blk = raid_dev->mbox_pool;
@@ -1270,8 +1268,7 @@ megaraid_mbox_teardown_dma_pools(adapter
 		dma_pool_free(raid_dev->mbox_pool_handle,
 			mbox_pci_blk[i].vaddr, mbox_pci_blk[i].dma_addr);
 	}
-	if (raid_dev->mbox_pool_handle)
-		dma_pool_destroy(raid_dev->mbox_pool_handle);
+	dma_pool_destroy(raid_dev->mbox_pool_handle);

 	return;
 }