RDMA/mlx5: Don't remove cache MRs when a delay is needed

stable inclusion
from stable-v5.10.111
commit 3a57babfb6e9871b961e3c36e616af87df4ef1e8
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5GL1Z

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3a57babfb6e9871b961e3c36e616af87df4ef1e8

--------------------------------

[ Upstream commit 84c2362f ]

Don't remove MRs from the cache if need to delay the removal.

Fixes: b9358bdb ("RDMA/mlx5: Fix locking in MR cache work queue")
Link: https://lore.kernel.org/r/c3087a90ff362c8796c7eaa2715128743ce36722.1649062436.git.leonro@nvidia.comSigned-off-by: NAharon Landau <aharonl@nvidia.com>
Reviewed-by: NShay Drory <shayd@nvidia.com>
Signed-off-by: NLeon Romanovsky <leonro@nvidia.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>

drivers/infiniband/hw/mlx5/mr.c

@@ -531,8 +531,10 @@ static void __cache_work_func(struct mlx5_cache_ent *ent)
 		spin_lock_irq(&ent->lock);
 		if (ent->disabled)
 			goto out;
-		if (need_delay)
+		if (need_delay) {
 			queue_delayed_work(cache->wq, &ent->dwork, 300 * HZ);
+			goto out;
+		}
 		remove_cache_mr_locked(ent);
 		queue_adjust_cache_locked(ent);
 	}