netdev - [for-next 05/14] net/mlx5e: Fixed sleeping inside atomic context

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Date:   Mon,  5 Mar 2018 12:46:28 -0800
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Doug Ledford <dledford@...hat.com>
Cc:     netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        Leon Romanovsky <leonro@...lanox.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Aviad Yehezkel <aviadye@...lanox.com>,
        Matan Barak <matanb@...lanox.com>,
        Boris Pismenny <borisp@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [for-next 05/14] net/mlx5e: Fixed sleeping inside atomic context

From: Aviad Yehezkel <aviadye@...lanox.com>

We can't allocate with GFP_KERNEL inside spinlock.
Actually ida_simple doesn't require spinlock so remove it.

Fixes: 547eede070eb ("net/mlx5e: IPSec, Innova IPSec offload infrastructure")
Signed-off-by: Aviad Yehezkel <aviadye@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c
index bac5103efad3..710521181143 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c
@@ -74,18 +74,16 @@ static int mlx5e_ipsec_sadb_rx_add(struct mlx5e_ipsec_sa_entry *sa_entry)
 	unsigned long flags;
 	int ret;
 
-	spin_lock_irqsave(&ipsec->sadb_rx_lock, flags);
 	ret = ida_simple_get(&ipsec->halloc, 1, 0, GFP_KERNEL);
 	if (ret < 0)
-		goto out;
+		return ret;
 
+	spin_lock_irqsave(&ipsec->sadb_rx_lock, flags);
 	sa_entry->handle = ret;
 	hash_add_rcu(ipsec->sadb_rx, &sa_entry->hlist, sa_entry->handle);
-	ret = 0;
-
-out:
 	spin_unlock_irqrestore(&ipsec->sadb_rx_lock, flags);
-	return ret;
+
+	return 0;
 }
 
 static void mlx5e_ipsec_sadb_rx_del(struct mlx5e_ipsec_sa_entry *sa_entry)
@@ -101,13 +99,10 @@ static void mlx5e_ipsec_sadb_rx_del(struct mlx5e_ipsec_sa_entry *sa_entry)
 static void mlx5e_ipsec_sadb_rx_free(struct mlx5e_ipsec_sa_entry *sa_entry)
 {
 	struct mlx5e_ipsec *ipsec = sa_entry->ipsec;
-	unsigned long flags;
 
 	/* Wait for the hash_del_rcu call in sadb_rx_del to affect data path */
 	synchronize_rcu();
-	spin_lock_irqsave(&ipsec->sadb_rx_lock, flags);
 	ida_simple_remove(&ipsec->halloc, sa_entry->handle);
-	spin_unlock_irqrestore(&ipsec->sadb_rx_lock, flags);
 }
 
 static enum mlx5_accel_ipsec_enc_mode mlx5e_ipsec_enc_mode(struct xfrm_state *x)
-- 
2.14.3