From: Yuval Avnery <yuvalav@xxxxxxxxxxxx>
[ Upstream commit 80a2a9026b24c6bd34b8d58256973e22270bedec ]
Refresh tirs is looping over a global list of tirs while netdevs are
adding and removing tirs from that list. That is why a lock is
required.
Fixes: 724b2aa15126 ("net/mlx5e: TIRs management refactoring")
Signed-off-by: Yuval Avnery <yuvalav@xxxxxxxxxxxx>
Signed-off-by: Saeed Mahameed <saeedm@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/mellanox/mlx5/core/en_common.c | 7 +++++++
include/linux/mlx5/driver.h | 2 ++
2 files changed, 9 insertions(+)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_common.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_common.c
@@ -45,7 +45,9 @@ int mlx5e_create_tir(struct mlx5_core_de
if (err)
return err;
+ mutex_lock(&mdev->mlx5e_res.td.list_lock);
list_add(&tir->list, &mdev->mlx5e_res.td.tirs_list);
+ mutex_unlock(&mdev->mlx5e_res.td.list_lock);
return 0;
}
@@ -53,8 +55,10 @@ int mlx5e_create_tir(struct mlx5_core_de
void mlx5e_destroy_tir(struct mlx5_core_dev *mdev,
struct mlx5e_tir *tir)
{
+ mutex_lock(&mdev->mlx5e_res.td.list_lock);
mlx5_core_destroy_tir(mdev, tir->tirn);
list_del(&tir->list);
+ mutex_unlock(&mdev->mlx5e_res.td.list_lock);
}
static int mlx5e_create_mkey(struct mlx5_core_dev *mdev, u32 pdn,
@@ -114,6 +118,7 @@ int mlx5e_create_mdev_resources(struct m
}
INIT_LIST_HEAD(&mdev->mlx5e_res.td.tirs_list);
+ mutex_init(&mdev->mlx5e_res.td.list_lock);
return 0;
@@ -151,6 +156,7 @@ int mlx5e_refresh_tirs_self_loopback_ena
MLX5_SET(modify_tir_in, in, bitmask.self_lb_en, 1);
+ mutex_lock(&mdev->mlx5e_res.td.list_lock);
list_for_each_entry(tir, &mdev->mlx5e_res.td.tirs_list, list) {
err = mlx5_core_modify_tir(mdev, tir->tirn, in, inlen);
if (err)
@@ -159,6 +165,7 @@ int mlx5e_refresh_tirs_self_loopback_ena
out:
kvfree(in);
+ mutex_unlock(&mdev->mlx5e_res.td.list_lock);
return err;
}
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -578,6 +578,8 @@ enum mlx5_pci_status {
};
struct mlx5_td {
+ /* protects tirs list changes while tirs refresh */
+ struct mutex list_lock;
struct list_head tirs_list;
u32 tdn;
};
