linux-kernel - [PATCH linux-next] RDMA/mlx4: NULL check before dev

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Message-ID: <202211231708254077305@zte.com.cn>
Date:   Wed, 23 Nov 2022 17:08:25 +0800 (CST)
From:   <zhang.songyi@....com.cn>
To:     <yishaih@...dia.com>
Cc:     <jgg@...pe.ca>, <leon@...nel.org>, <linux-rdma@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <zhang.songyi@....com.cn>
Subject: [PATCH linux-next] RDMA/mlx4: NULL check before dev_{put, hold} functions is not
 needed

From: zhang songyi <zhang.songyi@....com.cn>

The call netdev_{put, hold} of dev_{put, hold} will check NULL,
so there is no need to check before using dev_{put, hold}.

Fix the following coccicheck warnings:
/drivers/infiniband/hw/mlx4/main.c:1311:2-10: WARNING:
WARNING  NULL check before dev_{put, hold} functions is not needed.

/drivers/infiniband/hw/mlx4/main.c:148:2-10: WARNING:
WARNING  NULL check before dev_{put, hold} functions is not needed.

/drivers/infiniband/hw/mlx4/main.c:1959:3-11: WARNING:
WARNING  NULL check before dev_{put, hold} functions is not needed.

/drivers/infiniband/hw/mlx4/main.c:1962:3-10: WARNING:
WARNING  NULL check before dev_{put, hold} functions is not needed.

Signed-off-by: zhang songyi <zhang.songyi@....com.cn>
---
 drivers/infiniband/hw/mlx4/main.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index ba47874f90d3..dceebcd885bb 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -144,8 +144,7 @@ static struct net_device *mlx4_ib_get_netdev(struct ib_device *device,
                        }
                }
        }
-       if (dev)
-               dev_hold(dev);
+       dev_hold(dev);

        rcu_read_unlock();
        return dev;
@@ -1307,8 +1306,7 @@ int mlx4_ib_add_mc(struct mlx4_ib_dev *mdev, struct mlx4_ib_qp *mqp,

        spin_lock_bh(&mdev->iboe.lock);
        ndev = mdev->iboe.netdevs[mqp->port - 1];
-       if (ndev)
-               dev_hold(ndev);
+       dev_hold(ndev);
        spin_unlock_bh(&mdev->iboe.lock);

        if (ndev) {
@@ -1955,11 +1953,9 @@ static int mlx4_ib_mcg_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
        if (ge) {
                spin_lock_bh(&mdev->iboe.lock);
                ndev = ge->added ? mdev->iboe.netdevs[ge->port - 1] : NULL;
-               if (ndev)
-                       dev_hold(ndev);
+               dev_hold(ndev);
                spin_unlock_bh(&mdev->iboe.lock);
-               if (ndev)
-                       dev_put(ndev);
+               dev_put(ndev);
                list_del(&ge->list);
                kfree(ge);
        } else
--
2.15.2