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From: Saeed Mahameed <saeedm@mellanox.com>
To: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org, Parav Pandit <parav@mellanox.com>,
	Roi Dayan <roid@mellanox.com>, Eli Cohen <eli@mellanox.com>,
	Saeed Mahameed <saeedm@mellanox.com>
Subject: [net 3/8] net/mlx5: E-switch, Fix mutex init order
Date: Wed, 29 Apr 2020 15:54:44 -0700	[thread overview]
Message-ID: <20200429225449.60664-4-saeedm@mellanox.com> (raw)
In-Reply-To: <20200429225449.60664-1-saeedm@mellanox.com>

From: Parav Pandit <parav@mellanox.com>

In cited patch mutex is initialized after its used.
Below call trace is observed.
Fix the order to initialize the mutex early enough.
Similarly follow mirror sequence during cleanup.

kernel: DEBUG_LOCKS_WARN_ON(lock->magic != lock)
kernel: WARNING: CPU: 5 PID: 45916 at kernel/locking/mutex.c:938
__mutex_lock+0x7d6/0x8a0
kernel: Call Trace:
kernel: ? esw_vport_tbl_get+0x3b/0x250 [mlx5_core]
kernel: ? mark_held_locks+0x55/0x70
kernel: ? __slab_free+0x274/0x400
kernel: ? lockdep_hardirqs_on+0x140/0x1d0
kernel: esw_vport_tbl_get+0x3b/0x250 [mlx5_core]
kernel: ? mlx5_esw_chains_create_fdb_prio+0xa57/0xc20 [mlx5_core]
kernel: mlx5_esw_vport_tbl_get+0x88/0xf0 [mlx5_core]
kernel: mlx5_esw_chains_create+0x2f3/0x3e0 [mlx5_core]
kernel: esw_create_offloads_fdb_tables+0x11d/0x580 [mlx5_core]
kernel: esw_offloads_enable+0x26d/0x540 [mlx5_core]
kernel: mlx5_eswitch_enable_locked+0x155/0x860 [mlx5_core]
kernel: mlx5_devlink_eswitch_mode_set+0x1af/0x320 [mlx5_core]
kernel: devlink_nl_cmd_eswitch_set_doit+0x41/0xb0

Fixes: 96e326878fa5 ("net/mlx5e: Eswitch, Use per vport tables for mirroring")
Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
---
 .../ethernet/mellanox/mlx5/core/eswitch_offloads.c   | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
index 8289af360e8d..5d9def18ae3a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
@@ -2219,10 +2219,12 @@ static int esw_offloads_steering_init(struct mlx5_eswitch *esw)
 		total_vports = num_vfs + MLX5_SPECIAL_VPORTS(esw->dev);
 
 	memset(&esw->fdb_table.offloads, 0, sizeof(struct offloads_fdb));
+	mutex_init(&esw->fdb_table.offloads.vports.lock);
+	hash_init(esw->fdb_table.offloads.vports.table);
 
 	err = esw_create_uplink_offloads_acl_tables(esw);
 	if (err)
-		return err;
+		goto create_acl_err;
 
 	err = esw_create_offloads_table(esw, total_vports);
 	if (err)
@@ -2240,9 +2242,6 @@ static int esw_offloads_steering_init(struct mlx5_eswitch *esw)
 	if (err)
 		goto create_fg_err;
 
-	mutex_init(&esw->fdb_table.offloads.vports.lock);
-	hash_init(esw->fdb_table.offloads.vports.table);
-
 	return 0;
 
 create_fg_err:
@@ -2253,18 +2252,19 @@ static int esw_offloads_steering_init(struct mlx5_eswitch *esw)
 	esw_destroy_offloads_table(esw);
 create_offloads_err:
 	esw_destroy_uplink_offloads_acl_tables(esw);
-
+create_acl_err:
+	mutex_destroy(&esw->fdb_table.offloads.vports.lock);
 	return err;
 }
 
 static void esw_offloads_steering_cleanup(struct mlx5_eswitch *esw)
 {
-	mutex_destroy(&esw->fdb_table.offloads.vports.lock);
 	esw_destroy_vport_rx_group(esw);
 	esw_destroy_offloads_fdb_tables(esw);
 	esw_destroy_restore_table(esw);
 	esw_destroy_offloads_table(esw);
 	esw_destroy_uplink_offloads_acl_tables(esw);
+	mutex_destroy(&esw->fdb_table.offloads.vports.lock);
 }
 
 static void
-- 
2.25.4


  parent reply	other threads:[~2020-04-29 22:55 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-29 22:54 [pull request][net 0/8] Mellanox, mlx5 fixes 2020-04-29 Saeed Mahameed
2020-04-29 22:54 ` [net 1/8] net/mlx5: E-switch, Fix error unwinding flow for steering init failure Saeed Mahameed
2020-04-29 22:54 ` [net 2/8] net/mlx5: E-switch, Fix printing wrong error value Saeed Mahameed
2020-04-29 22:54 ` Saeed Mahameed [this message]
2020-04-29 22:54 ` [net 4/8] net/mlx5: DR, On creation set CQ's arm_db member to right value Saeed Mahameed
2020-04-29 22:54 ` [net 5/8] net/mlx5: Fix forced completion access non initialized command entry Saeed Mahameed
2020-04-29 22:54 ` [net 6/8] net/mlx5: Fix command entry leak in Internal Error State Saeed Mahameed
2020-04-29 22:54 ` [net 7/8] net/mlx5e: Fix q counters on uplink representors Saeed Mahameed
2020-04-29 22:54 ` [net 8/8] net/mlx5e: kTLS, Add resiliency to zero-size record frags in TX resync flow Saeed Mahameed
2020-04-30  0:12   ` Jakub Kicinski
2020-04-30  8:22     ` Tariq Toukan
2020-04-30 15:37       ` Saeed Mahameed

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