netdev - [PATCH net-next 08/11] mlxsw: spectrum: Remove unnecessary RCU read-side critical section

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Date:   Sun, 14 Mar 2021 14:19:37 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, jiri@...dia.com,
        yotam.gi@...il.com, jhs@...atatu.com, xiyou.wangcong@...il.com,
        roopa@...dia.com, peter.phaal@...on.com, neil.mckee@...on.com,
        mlxsw@...dia.com, Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 08/11] mlxsw: spectrum: Remove unnecessary RCU read-side critical section

From: Ido Schimmel <idosch@...dia.com>

Since commit 7d8e8f3433dc ("mlxsw: core: Increase scope of RCU read-side
critical section"), all Rx handlers are called from an RCU read-side
critical section.

Remove the unnecessary rcu_read_lock() / rcu_read_unlock().

Signed-off-by: Ido Schimmel <idosch@...dia.com>
Reviewed-by: Jiri Pirko <jiri@...dia.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index 3b15f8d728a3..3d8e8d8dfff5 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -2225,15 +2225,12 @@ void mlxsw_sp_sample_receive(struct mlxsw_sp *mlxsw_sp, struct sk_buff *skb,
 		goto out;
 	}
 
-	rcu_read_lock();
 	sample = rcu_dereference(mlxsw_sp_port->sample);
 	if (!sample)
-		goto out_unlock;
+		goto out;
 	md.trunc_size = sample->truncate ? sample->trunc_size : skb->len;
 	md.in_ifindex = mlxsw_sp_port->dev->ifindex;
 	psample_sample_packet(sample->psample_group, skb, sample->rate, &md);
-out_unlock:
-	rcu_read_unlock();
 out:
 	consume_skb(skb);
 }
-- 
2.29.2