[PATCH 5.16 179/285] RDMA/mlx5: Dont remove cache MRs when a delay is needed

Greg Kroah-Hartman
2022-04-12T07:56:55Z

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