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Date: Tue, 8 Dec 2020 21:39:28 +0200 From: Vladimir Oltean <vladimir.oltean@....com> To: Yishai Hadas <yishaih@...dia.com>, Doug Ledford <dledford@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>, linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org Cc: netdev@...r.kernel.org, Leon Romanovsky <leonro@...dia.com> Subject: [PATCH rdma-next] RDMA/mlx4: remove bogus dev_base_lock usage It is not clear what this lock protects. If the authors wanted to ensure that "dev" does not disappear, that is impossible, given the following code path: mlx4_ib_netdev_event (under RTNL mutex) -> mlx4_ib_scan_netdevs -> mlx4_ib_update_qps Also, the dev_base_lock does not protect dev->dev_addr either. So it serves no purpose here. Remove it. Reviewed-by: Leon Romanovsky <leonro@...dia.com> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com> --- drivers/infiniband/hw/mlx4/main.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c index f0864f40ea1a..e3cd402c079a 100644 --- a/drivers/infiniband/hw/mlx4/main.c +++ b/drivers/infiniband/hw/mlx4/main.c @@ -2265,10 +2265,7 @@ static void mlx4_ib_update_qps(struct mlx4_ib_dev *ibdev, u64 release_mac = MLX4_IB_INVALID_MAC; struct mlx4_ib_qp *qp; - read_lock(&dev_base_lock); new_smac = mlx4_mac_to_u64(dev->dev_addr); - read_unlock(&dev_base_lock); - atomic64_set(&ibdev->iboe.mac[port - 1], new_smac); /* no need for update QP1 and mac registration in non-SRIOV */ -- 2.25.1
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