RDMA/mlx4: Remove NULL check before dev_{put, hold}

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@zte.com.cn>
Link: https://lore.kernel.org/r/202211291554079687539@zte.com.cn
Signed-off-by: Leon Romanovsky <leon@kernel.org>

diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index ba47874f90d381695f06d732bc1e520400c7c647..dceebcd885bbd05c228e79408565a7b466f56e02 100644 (file)
--- 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