linux-kernel - [PATCH] block: DAC960: fix ifnullfree.cocci warnings

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Date:   Sat, 11 Mar 2017 15:15:21 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Romain Perier <romain.perier@...labora.com>
Cc:     kbuild-all@...org, Dan Williams <dan.j.williams@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        jeffrey.t.kirsher@...el.com,
        "David S. Miller" <davem@...emloft.net>, stas.yakovlev@...il.com,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Romain Perier <romain.perier@...labora.com>,
        Peter Senna Tschudin <peter.senna@...labora.co.uk>
Subject: [PATCH] block: DAC960: fix ifnullfree.cocci warnings

drivers/block/DAC960.c:441:3-19: 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/block/DAC960.c:446:1-17: 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

CC: Romain Perier <romain.perier@...labora.com>
Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
---

 DAC960.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -437,13 +437,11 @@ static void DAC960_DestroyAuxiliaryStruc
       Controller->CurrentStatusBuffer = NULL;
     }
 
-  if (ScatterGatherPool != NULL)
-  	dma_pool_destroy(ScatterGatherPool);
+  dma_pool_destroy(ScatterGatherPool);
   if (Controller->FirmwareType == DAC960_V1_Controller)
   	return;
 
-  if (RequestSensePool != NULL)
-	dma_pool_destroy(RequestSensePool);
+  dma_pool_destroy(RequestSensePool);
 
   for (i = 0; i < DAC960_MaxLogicalDrives; i++) {
 	kfree(Controller->V2.LogicalDeviceInformation[i]);