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vdpa/mlx5: Fix double release of debugfs entry

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The error path in setup_driver deletes the debugfs entry but doesn't
clear the pointer. During .dev_del the invalid pointer will be released
again causing a crash.

This patch fixes the issue by always clearing the debugfs entry in
mlx5_vdpa_remove_debugfs. Also, stop removing the debugfs entry in
.dev_del op: the debugfs entry is already handled within the
setup_driver/teardown_driver scope.

Cc: stable@vger.kernel.org
Fixes: f0417e72ad ("vdpa/mlx5: Add and remove debugfs in setup/teardown driver")
Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: Gal Pressman <gal@nvidia.com>
Message-Id: <20230829174014.928189-2-dtatulea@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Dragos Tatulea 2023-08-29 20:40:09 +03:00 • committed by Michael S. Tsirkin
parent fab7f25922
commit f8a3db47d9
3 changed files with 6 additions and 8 deletions
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5
drivers/vdpa/mlx5/net/debug.c
View file

@ -146,7 +146,8 @@ void mlx5_vdpa_add_debugfs(struct mlx5_vdpa_net *ndev)
ndev->rx_dent = debugfs_create_dir("rx", ndev->debugfs);
}
void mlx5_vdpa_remove_debugfs(struct dentry *dbg)
void mlx5_vdpa_remove_debugfs(struct mlx5_vdpa_net *ndev)
{
debugfs_remove_recursive(dbg);
debugfs_remove_recursive(ndev->debugfs);
ndev->debugfs = NULL;
}

7
drivers/vdpa/mlx5/net/mlx5_vnet.c
View file

@ -2713,7 +2713,7 @@ err_tir:
err_rqt:
teardown_virtqueues(ndev);
err_setup:
mlx5_vdpa_remove_debugfs(ndev->debugfs);
mlx5_vdpa_remove_debugfs(ndev);
out:
return err;
}
@ -2727,8 +2727,7 @@ static void teardown_driver(struct mlx5_vdpa_net *ndev)
if (!ndev->setup)
return;
mlx5_vdpa_remove_debugfs(ndev->debugfs);
ndev->debugfs = NULL;
mlx5_vdpa_remove_debugfs(ndev);
teardown_steering(ndev);
destroy_tir(ndev);
destroy_rqt(ndev);
@ -3489,8 +3488,6 @@ static void mlx5_vdpa_dev_del(struct vdpa_mgmt_dev *v_mdev, struct vdpa_device *
struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
struct workqueue_struct *wq;
mlx5_vdpa_remove_debugfs(ndev->debugfs);
ndev->debugfs = NULL;
unregister_link_notifier(ndev);
_vdpa_unregister_device(dev);
wq = mvdev->wq;

2
drivers/vdpa/mlx5/net/mlx5_vnet.h
View file

@ -88,7 +88,7 @@ struct macvlan_node {
};
void mlx5_vdpa_add_debugfs(struct mlx5_vdpa_net *ndev);
void mlx5_vdpa_remove_debugfs(struct dentry *dbg);
void mlx5_vdpa_remove_debugfs(struct mlx5_vdpa_net *ndev);
void mlx5_vdpa_add_rx_flow_table(struct mlx5_vdpa_net *ndev);
void mlx5_vdpa_remove_rx_flow_table(struct mlx5_vdpa_net *ndev);
void mlx5_vdpa_add_tirn(struct mlx5_vdpa_net *ndev);