netdev - [PATCH mlx5-next v1 1/3] net/mlx5: Nullify qp->dbg pointer post destruction

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Message-Id: <62b3e99480984ee18a8e77d9667ef3f06420f1a8.1678973858.git.leon@kernel.org>
Date:   Thu, 16 Mar 2023 15:39:26 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     Patrisious Haddad <phaddad@...dia.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>, linux-rdma@...r.kernel.org,
        netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: [PATCH mlx5-next v1 1/3] net/mlx5: Nullify qp->dbg pointer post destruction

From: Patrisious Haddad <phaddad@...dia.com>

Nullifying qp->dbg is a preparation for the next patches
from the series in which mlx5_core_destroy_qp() could actually fail,
and then it can be called again which causes a kernel crash, since
qp->dbg was not nullified in previous call.

Signed-off-by: Patrisious Haddad <phaddad@...dia.com>
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/debugfs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/debugfs.c b/drivers/net/ethernet/mellanox/mlx5/core/debugfs.c
index bb95b40d25eb..b08b5695ee45 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/debugfs.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/debugfs.c
@@ -513,11 +513,11 @@ EXPORT_SYMBOL(mlx5_debug_qp_add);
 
 void mlx5_debug_qp_remove(struct mlx5_core_dev *dev, struct mlx5_core_qp *qp)
 {
-	if (!mlx5_debugfs_root)
+	if (!mlx5_debugfs_root || !qp->dbg)
 		return;
 
-	if (qp->dbg)
-		rem_res_tree(qp->dbg);
+	rem_res_tree(qp->dbg);
+	qp->dbg = NULL;
 }
 EXPORT_SYMBOL(mlx5_debug_qp_remove);
 
-- 
2.39.2