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net/mlx5: Devcom, serialize devcom registration 

From one hand, mlx5 driver is allowing to probe PFs in parallel.
From the other hand, devcom, which is a share resource between PFs, is
registered without any lock. This might resulted in memory problems.

Hence, use the global mlx5_dev_list_lock in order to serialize devcom
registration.

Fixes: fadd59fc50 ("net/mlx5: Introduce inter-device communication mechanism")
Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
This commit is contained in:
Shay Drory 2023-05-02 13:36:42 +03:00 committed by Saeed Mahameed
parent af87194352
commit 1f893f57a3
1 changed files with 14 additions and 5 deletions
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19
drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c
View File

@ -3,6 +3,7 @@
#include <linux/mlx5/vport.h>
#include "lib/devcom.h"
#include "mlx5_core.h"
static LIST_HEAD(devcom_list);
@ -77,6 +78,7 @@ struct mlx5_devcom *mlx5_devcom_register_device(struct mlx5_core_dev *dev)
if (MLX5_CAP_GEN(dev, num_lag_ports) != MLX5_DEVCOM_PORTS_SUPPORTED)
return NULL;
mlx5_dev_list_lock();
sguid0 = mlx5_query_nic_system_image_guid(dev);
list_for_each_entry(iter, &devcom_list, list) {
struct mlx5_core_dev *tmp_dev = NULL;
@ -102,8 +104,10 @@ struct mlx5_devcom *mlx5_devcom_register_device(struct mlx5_core_dev *dev)
if (!priv) {
priv = mlx5_devcom_list_alloc();
if (!priv)
return ERR_PTR(-ENOMEM);
if (!priv) {
devcom = ERR_PTR(-ENOMEM);
goto out;
}
idx = 0;
new_priv = true;
@ -114,12 +118,14 @@ struct mlx5_devcom *mlx5_devcom_register_device(struct mlx5_core_dev *dev)
if (!devcom) {
if (new_priv)
kfree(priv);
return ERR_PTR(-ENOMEM);
devcom = ERR_PTR(-ENOMEM);
goto out;
}
if (new_priv)
list_add(&priv->list, &devcom_list);
out:
mlx5_dev_list_unlock();
return devcom;
}
@ -132,6 +138,7 @@ void mlx5_devcom_unregister_device(struct mlx5_devcom *devcom)
if (IS_ERR_OR_NULL(devcom))
return;
mlx5_dev_list_lock();
priv = devcom->priv;
priv->devs[devcom->idx] = NULL;
@ -142,10 +149,12 @@ void mlx5_devcom_unregister_device(struct mlx5_devcom *devcom)
break;
if (i != MLX5_DEVCOM_PORTS_SUPPORTED)
return;
goto out;
list_del(&priv->list);
kfree(priv);
out:
mlx5_dev_list_unlock();
}
void mlx5_devcom_register_component(struct mlx5_devcom *devcom,