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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Aharon Landau <aharonl@nvidia.com>,
        Shay Drory <shayd@nvidia.com>,
        Leon Romanovsky <leonro@nvidia.com>,
        Jason Gunthorpe <jgg@nvidia.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.16 179/285] RDMA/mlx5: Dont remove cache MRs when a delay is needed
Date:   Tue, 12 Apr 2022 08:30:36 +0200
Message-Id: <20220412062948.832760271@linuxfoundation.org>
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From: Aharon Landau <aharonl@nvidia.com>

[ Upstream commit 84c2362fb65d69c721fec0974556378cbb36a62b ]

Don't remove MRs from the cache if need to delay the removal.

Fixes: b9358bdbc713 ("RDMA/mlx5: Fix locking in MR cache work queue")
Link: https://lore.kernel.org/r/c3087a90ff362c8796c7eaa2715128743ce36722.1649062436.git.leonro@nvidia.com
Signed-off-by: Aharon Landau <aharonl@nvidia.com>
Reviewed-by: Shay Drory <shayd@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/infiniband/hw/mlx5/mr.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index 2910d7833313..d3b2d02a4872 100644
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -541,8 +541,10 @@ static void __cache_work_func(struct mlx5_cache_ent *ent)
 		spin_lock_irq(&ent->lock);
 		if (ent->disabled)
 			goto out;
-		if (need_delay)
+		if (need_delay) {
 			queue_delayed_work(cache->wq, &ent->dwork, 300 * HZ);
+			goto out;
+		}
 		remove_cache_mr_locked(ent);
 		queue_adjust_cache_locked(ent);
 	}
-- 
2.35.1