[PATCH rdma-rc] RDMA/mlx5: Remove not-used cache disable flag

[Leon Romanovsky <leon@kernel.org>]

From: Leon Romanovsky <leonro@nvidia.com>

During execution of mlx5_mkey_cache_cleanup(), there is a guarantee
that MR are not registered and/or destroyed. It means that we don't
need newly introduced cache disable flag.

Fixes: 374012b00457 ("RDMA/mlx5: Fix mkey cache possible deadlock on cleanup")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
 drivers/infiniband/hw/mlx5/mlx5_ib.h | 1 -
 drivers/infiniband/hw/mlx5/mr.c      | 5 -----
 2 files changed, 6 deletions(-)

diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h
index d1ff98aad162..16713baf0d06 100644
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -798,7 +798,6 @@ struct mlx5_mkey_cache {
 	struct dentry		*fs_root;
 	unsigned long		last_add;
 	struct delayed_work	remove_ent_dwork;
-	u8			disable: 1;
 };
 
 struct mlx5_ib_port_resources {
diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index 433f96459246..8a3762d9ff58 100644
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -1026,7 +1026,6 @@ void mlx5_mkey_cache_cleanup(struct mlx5_ib_dev *dev)
 		return;
 
 	mutex_lock(&dev->cache.rb_lock);
-	dev->cache.disable = true;
 	for (node = rb_first(root); node; node = rb_next(node)) {
 		ent = rb_entry(node, struct mlx5_cache_ent, node);
 		xa_lock_irq(&ent->mkeys);
@@ -1830,10 +1829,6 @@ static int cache_ent_find_and_store(struct mlx5_ib_dev *dev,
 	}
 
 	mutex_lock(&cache->rb_lock);
-	if (cache->disable) {
-		mutex_unlock(&cache->rb_lock);
-		return 0;
-	}
 	ent = mkey_cache_ent_from_rb_key(dev, mr->mmkey.rb_key);
 	if (ent) {
 		if (ent->rb_key.ndescs == mr->mmkey.rb_key.ndescs) {
-- 
2.41.0