[net:master 30/34] net/ipv6/route.c:2946:3-8: 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.

[net:master 30/34] net/ipv6/route.c:2946:3-8: 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.

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git master
head:   f53de1e9a4aaf8cbe08845da6f7ff26a078ac507
commit: 6b9ea5a64ed5eeb3f68f2e6fcce0ed1179801d1e [30/34] ipv6: fix multipath route replace error recovery


coccinelle warnings: (new ones prefixed by >>)

>> net/ipv6/route.c:2946:3-8: 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.

Please review and possibly fold the followup patch.

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[PATCH] ipv6: fix ifnullfree.cocci warnings

[kbuild test robot]

net/ipv6/route.c:2946:3-8: 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: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---

 route.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2942,8 +2942,7 @@ cleanup:
 	list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
 		if (nh->rt6_info)
 			dst_free(&nh->rt6_info->dst);
-		if (nh->mxc.mx)
-			kfree(nh->mxc.mx);
+		kfree(nh->mxc.mx);
 		list_del(&nh->next);
 		kfree(nh);
 	}

Re: [PATCH] ipv6: fix ifnullfree.cocci warnings

[David Miller]

From: kbuild test robot <fengguang.wu@intel.com>
Date: Thu, 10 Sep 2015 06:57:12 +0800

> net/ipv6/route.c:2946:3-8: 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: Roopa Prabhu <roopa@cumulusnetworks.com>
> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>

Applied, thanks.

Re: [PATCH] ipv6: fix ifnullfree.cocci warnings

[roopa]

On 9/9/15, 3:57 PM, kbuild test robot wrote:
> net/ipv6/route.c:2946:3-8: 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: Roopa Prabhu <roopa@cumulusnetworks.com>
> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
>
FWIW, Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>