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| author | Jiri Pirko <jiri@nvidia.com> | 2022-11-01 15:36:01 +0100 |
|---|---|---|
| committer | Saeed Mahameed <saeedm@nvidia.com> | 2023-02-08 20:40:57 -0800 |
| commit | dca55da0a15717dde509d17163946e951bad56c4 (patch) | |
| tree | 2ca0c18b8531afaaa229ec7237506fa3d5afc674 /drivers/net/ethernet/mellanox/mlx5 | |
| parent | c7d4e6ab3165693342c21f6faf80d983137fee0c (diff) | |
| download | linux-stable-dca55da0a15717dde509d17163946e951bad56c4.tar.gz linux-stable-dca55da0a15717dde509d17163946e951bad56c4.tar.bz2 linux-stable-dca55da0a15717dde509d17163946e951bad56c4.zip | |
RDMA/mlx5: Track netdev to avoid deadlock during netdev notifier unregister
When removing a network namespace with mlx5 devlink instance being in
it, following callchain is performed:
cleanup_net (takes down_read(&pernet_ops_rwsem)
devlink_pernet_pre_exit()
devlink_reload()
mlx5_devlink_reload_down()
mlx5_unload_one_devl_locked()
mlx5_detach_device()
del_adev()
mlx5r_remove()
__mlx5_ib_remove()
mlx5_ib_roce_cleanup()
mlx5_remove_netdev_notifier()
unregister_netdevice_notifier (takes down_write(&pernet_ops_rwsem)
This deadlocks.
Resolve this by converting to register_netdevice_notifier_dev_net()
which does not take pernet_ops_rwsem and moves the notifier block around
according to netdev it takes as arg.
Use previously introduced netdev added/removed events to track uplink
netdev to be used for register_netdevice_notifier_dev_net() purposes.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx5')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/events.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/events.c b/drivers/net/ethernet/mellanox/mlx5/core/events.c index 9459e56ee90a..718cf09c28ce 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/events.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/events.c @@ -424,6 +424,7 @@ int mlx5_blocking_notifier_register(struct mlx5_core_dev *dev, struct notifier_b return blocking_notifier_chain_register(&events->sw_nh, nb); } +EXPORT_SYMBOL(mlx5_blocking_notifier_register); int mlx5_blocking_notifier_unregister(struct mlx5_core_dev *dev, struct notifier_block *nb) { @@ -431,6 +432,7 @@ int mlx5_blocking_notifier_unregister(struct mlx5_core_dev *dev, struct notifier return blocking_notifier_chain_unregister(&events->sw_nh, nb); } +EXPORT_SYMBOL(mlx5_blocking_notifier_unregister); int mlx5_blocking_notifier_call_chain(struct mlx5_core_dev *dev, unsigned int event, void *data) |