linux-kernel - Re: [PATCH 08/29] IB/mlx4: Delete an unnecessary check before the function call "kfree" in free_pv

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Date:   Sun, 19 Feb 2017 17:11:05 +0000
From:   Majd Dibbiny <majd@...lanox.com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
CC:     "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Doug Ledford <dledford@...hat.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        "Leon Romanovsky" <leonro@...lanox.com>,
        Matan Barak <matanb@...lanox.com>,
        "Sean Hefty" <sean.hefty@...el.com>,
        Yishai Hadas <yishaih@...lanox.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH 08/29] IB/mlx4: Delete an unnecessary check before the
 function call "kfree" in free_pv_object()


> On Feb 18, 2017, at 11:28 PM, SF Markus Elfring <elfring@...rs.sourceforge.net> wrote:
> 
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Fri, 17 Feb 2017 22:06:24 +0100
> 
> The script "checkpatch.pl" pointed information out like the following.
> 
> WARNING: kfree(NULL) is safe and this check is probably not required
> 
> Thus fix the affected source code place.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
> drivers/infiniband/hw/mlx4/mad.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/mlx4/mad.c b/drivers/infiniband/hw/mlx4/mad.c
> index 75b6522b3a8f..9518b7244269 100644
> --- a/drivers/infiniband/hw/mlx4/mad.c
> +++ b/drivers/infiniband/hw/mlx4/mad.c
> @@ -1966,10 +1966,8 @@ static int alloc_pv_object(struct mlx4_ib_dev *dev, int slave, int port,
> 
> static void free_pv_object(struct mlx4_ib_dev *dev, int slave, int port)
> {
> -    if (dev->sriov.demux[port - 1].tun[slave]) {
> -        kfree(dev->sriov.demux[port - 1].tun[slave]);
> -        dev->sriov.demux[port - 1].tun[slave] = NULL;
> -    }
> +    kfree(dev->sriov.demux[port - 1].tun[slave]);
> +    dev->sriov.demux[port - 1].tun[slave] = NULL;
> }
In case it was NULL, we will have a redundant assignment here.
I don't think this change is needed..
> 
> static int create_pv_resources(struct ib_device *ibdev, int slave, int port,
> -- 
> 2.11.1
> 
> --
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