RDMA/mlx5: Fix the flow of a miss in the allocation of a cache ODP MR

[ 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@nvidia.com
Signed-off-by: Aharon Landau <aharonl@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>

diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index 157d862fb86429ba3ba51cd18e98adf632f4d1cf..2910d78333130a96a56c807d810443d4297f243f 100644 (file)
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -585,6 +585,8 @@ struct mlx5_ib_mr *mlx5_mr_cache_alloc(struct mlx5_ib_dev *dev,
        ent = &cache->ent[entry];
        spin_lock_irq(&ent->lock);
        if (list_empty(&ent->head)) {
+               queue_adjust_cache_locked(ent);
+               ent->miss++;
                spin_unlock_irq(&ent->lock);
                mr = create_cache_mr(ent);
                if (IS_ERR(mr))