[PATCH 5.15 490/913] RDMA/mlx5: Fix the flow of a miss in the allocation of a cache ODP MR

From: Greg Kroah-Hartman
Date: Tue Apr 05 2022 - 16:42:32 EST

From: Aharon Landau <aharonl@xxxxxxxxxx>

[ Upstream commit 2f0e60d5e9f96341a0c8a01be8878cdb3b29ff20 ]

When an ODP MR cache entry is empty and trying to allocate it, increment
the ent->miss counter and call to queue_adjust_cache_locked() to verify
the entry is balanced.

Fixes: aad719dcf379 ("RDMA/mlx5: Allow MRs to be created in the cache synchronously")
Link: https://lore.kernel.org/r/09503e295276dcacc92cb1d8aef1ad0961c99dc1.1644947594.git.leonro@xxxxxxxxxx
Signed-off-by: Aharon Landau <aharonl@xxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/infiniband/hw/mlx5/mr.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index 22e2f4d79743..7bb1b9d0941c 100644
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -580,6 +580,8 @@ struct mlx5_ib_mr *mlx5_mr_cache_alloc(struct mlx5_ib_dev *dev,
ent = &cache->ent[entry];
if (list_empty(&ent->head)) {
+ queue_adjust_cache_locked(ent);
+ ent->miss++;
mr = create_cache_mr(ent);
if (IS_ERR(mr))