In the PCI removal function, PMD releases all driver resources allocated
in the probe function.

The MR btree memory is allocated in the probe function, but it is not
freed in remove function what caused a memory leak.

Release it.

Fixes: cda883bbb655 ("regex/mlx5: add dynamic memory registration to datapath")
Cc: stable@dpdk.org

Signed-off-by: Michael Baum <redacted>
---
 drivers/regex/mlx5/mlx5_regex.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/regex/mlx5/mlx5_regex.c b/drivers/regex/mlx5/mlx5_regex.c
index 0f12d94d7e..f64dc2824c 100644
--- a/drivers/regex/mlx5/mlx5_regex.c
+++ b/drivers/regex/mlx5/mlx5_regex.c

@@ -280,6 +280,8 @@ mlx5_regex_pci_remove(struct rte_pci_device *pci_dev)
 		if (TAILQ_EMPTY(&mlx5_mem_event_list))
 			rte_mem_event_callback_unregister("MLX5_MEM_EVENT_CB",
 							  NULL);
+		if (priv->mr_scache.cache.table)
+			mlx5_mr_release_cache(&priv->mr_scache);
 		if (priv->pd)
 			mlx5_glue->dealloc_pd(priv->pd);
 		if (priv->uar)

-- 
2.25.1