net/mlx5: Unregister devlink params in case interface is down

Currently, in case an interface is down, mlx5 driver doesn't
unregister its devlink params, which leads to this WARN[1].
Fix it by unregistering devlink params in that case as well.

[1]
[  295.244769 ] WARNING: CPU: 15 PID: 1 at net/core/devlink.c:9042 devlink_free+0x174/0x1fc
[  295.488379 ] CPU: 15 PID: 1 Comm: shutdown Tainted: G S         OE 5.15.0-1017.19.3.g0677e61-bluefield #g0677e61
[  295.509330 ] Hardware name: https://www.mellanox.com BlueField SoC/BlueField SoC, BIOS 4.2.0.12761 Jun  6 2023
[  295.543096 ] pc : devlink_free+0x174/0x1fc
[  295.551104 ] lr : mlx5_devlink_free+0x18/0x2c [mlx5_core]
[  295.561816 ] sp : ffff80000809b850
[  295.711155 ] Call trace:
[  295.716030 ]  devlink_free+0x174/0x1fc
[  295.723346 ]  mlx5_devlink_free+0x18/0x2c [mlx5_core]
[  295.733351 ]  mlx5_sf_dev_remove+0x98/0xb0 [mlx5_core]
[  295.743534 ]  auxiliary_bus_remove+0x2c/0x50
[  295.751893 ]  __device_release_driver+0x19c/0x280
[  295.761120 ]  device_release_driver+0x34/0x50
[  295.769649 ]  bus_remove_device+0xdc/0x170
[  295.777656 ]  device_del+0x17c/0x3a4
[  295.784620 ]  mlx5_sf_dev_remove+0x28/0xf0 [mlx5_core]
[  295.794800 ]  mlx5_sf_dev_table_destroy+0x98/0x110 [mlx5_core]
[  295.806375 ]  mlx5_unload+0x34/0xd0 [mlx5_core]
[  295.815339 ]  mlx5_unload_one+0x70/0xe4 [mlx5_core]
[  295.824998 ]  shutdown+0xb0/0xd8 [mlx5_core]
[  295.833439 ]  pci_device_shutdown+0x3c/0xa0
[  295.841651 ]  device_shutdown+0x170/0x340
[  295.849486 ]  __do_sys_reboot+0x1f4/0x2a0
[  295.857322 ]  __arm64_sys_reboot+0x2c/0x40
[  295.865329 ]  invoke_syscall+0x78/0x100
[  295.872817 ]  el0_svc_common.constprop.0+0x54/0x184
[  295.882392 ]  do_el0_svc+0x30/0xac
[  295.889008 ]  el0_svc+0x48/0x160
[  295.895278 ]  el0t_64_sync_handler+0xa4/0x130
[  295.903807 ]  el0t_64_sync+0x1a4/0x1a8
[  295.911120 ] ---[ end trace 4f1d2381d00d9dce  ]---

Fixes: fe578cbb ("net/mlx5: Move devlink registration before mlx5_load")
Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Maher Sanalla <msanalla@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/main.c

@@ -1506,6 +1506,7 @@ void mlx5_uninit_one(struct mlx5_core_dev *dev)
 	if (!test_bit(MLX5_INTERFACE_STATE_UP, &dev->intf_state)) {
 		mlx5_core_warn(dev, "%s: interface is down, NOP\n",
 			       __func__);
+		mlx5_devlink_params_unregister(priv_to_devlink(dev));
 		mlx5_cleanup_once(dev);
 		goto out;
 	}