linux-kernel - RE: [PATCH] IB/mad: fix ifnullfree.cocci warnings

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Date:	Tue, 3 Feb 2015 20:46:21 +0000
From:	"Weiny, Ira" <ira.weiny@...el.com>
To:	"Wu, Fengguang" <fengguang.wu@...el.com>
CC:	"kbuild-all@...org" <kbuild-all@...org>,
	Roland Dreier <roland@...nel.org>,
	"Hefty, Sean" <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Yan Burman <yanb@...lanox.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] IB/mad: fix ifnullfree.cocci warnings



> -----Original Message-----
> From: Wu, Fengguang
> Sent: Tuesday, January 27, 2015 1:36 PM
> To: Weiny, Ira
> Cc: kbuild-all@...org; Roland Dreier; Hefty, Sean; Hal Rosenstock; Or Gerlitz;
> Yan Burman; linux-rdma@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [PATCH] IB/mad: fix ifnullfree.cocci warnings
> 
> drivers/infiniband/core/mad.c:2088:3-8: 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
> 
> Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>


Signed-off-by: Ira Weiny <ira.weiny@...el.com>


> ---
> 
>  mad.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> --- a/drivers/infiniband/core/mad.c
> +++ b/drivers/infiniband/core/mad.c
> @@ -2084,8 +2084,7 @@ out:
>  	/* Post another receive request for this QP */
>  	if (response) {
>  		ib_mad_post_receive_mads(qp_info, response);
> -		if (recv)
> -			kfree(recv);
> +		kfree(recv);
>  	} else
>  		ib_mad_post_receive_mads(qp_info, recv);  }
--
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