RDMA/mlx5: Remove extra unlock on error path

commit c1eb2512596fb3542357bb6c34c286f5e0374538 upstream.

The below commit lifted the locking out of this function but left this
error path unlock behind resulting in unbalanced locking. Remove the
missed unlock too.

Cc: stable@vger.kernel.org
Fixes: 627122280c87 ("RDMA/mlx5: Add work to remove temporary entries from the cache")
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Michael Guralnik <michaelgur@nvidia.com>
Link: https://lore.kernel.org/r/78090c210c750f47219b95248f9f782f34548bb1.1716900410.git.leon@kernel.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index 46847249b46770343fcd4cc0a60ddc7de8b842db..2bc34123fe2fa3743326b67242d50b361a7df4d7 100644 (file)
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -697,10 +697,8 @@ static int mlx5_cache_ent_insert(struct mlx5_mkey_cache *cache,
                        new = &((*new)->rb_left);
                if (cmp < 0)
                        new = &((*new)->rb_right);
-               if (cmp == 0) {
-                       mutex_unlock(&cache->rb_lock);
+               if (cmp == 0)
                        return -EEXIST;
-               }
        }
 
        /* Add new node and rebalance tree. */