From: <zhang.songyi@zte.com.cn>
To: <yishaih@nvidia.com>
Cc: <jgg@ziepe.ca>, <leon@kernel.org>, <linux-rdma@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <zhang.songyi@zte.com.cn>
Subject: [PATCH linux-next] RDMA/mlx4: NULL check before dev_{put, hold} functions is not
needed
Date: Wed, 23 Nov 2022 17:08:25 +0800 (CST) [thread overview]
Message-ID: <202211231708254077305@zte.com.cn> (raw)
From: zhang songyi <zhang.songyi@zte.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@zte.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
next reply other threads:[~2022-11-23 9:09 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-23 9:08 zhang.songyi [this message]
2022-11-28 9:50 ` [PATCH linux-next] RDMA/mlx4: NULL check before dev_{put, hold} functions is not? needed Leon Romanovsky
-- strict thread matches above, loose matches on Subject: below --
2022-11-28 10:58 [PATCH linux-next] RDMA/mlx4: NULL check before dev_{put, hold} functions is not needed zhang.songyi
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