From: Aharon Landau <aharonl@nvidia.com>
Date: Tue, 27 Jul 2021 10:16:06 +0300
Subject: RDMA/mlx5: Delay emptying a cache entry when a new MR is added to it
 recently
Patch-mainline: v5.14-rc5
Git-commit: d6793ca97b76642b77629dd0783ec64782a50bdb
References: jsc#SLE-15175

Fixing a typo that causes a cache entry to shrink immediately after adding
to it new MRs if the entry size exceeds the high limit.  In doing so, the
cache misses its purpose to prevent the creation of new mkeys on the
runtime by using the cached ones.

Fixes: b9358bdbc713 ("RDMA/mlx5: Fix locking in MR cache work queue")
Link: https://lore.kernel.org/r/fcb546986be346684a016f5ca23a0567399145fa.1627370131.git.leonro@nvidia.com
Signed-off-by: Aharon Landau <aharonl@nvidia.com>
Reviewed-by: Maor Gottlieb <maorg@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/hw/mlx5/mr.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -502,8 +502,8 @@ static void __cache_work_func(struct mlx
 		 */
 		spin_unlock_irq(&ent->lock);
 		need_delay = need_resched() || someone_adding(cache) ||
-			     time_after(jiffies,
-					READ_ONCE(cache->last_add) + 300 * HZ);
+			     !time_after(jiffies,
+					 READ_ONCE(cache->last_add) + 300 * HZ);
 		spin_lock_irq(&ent->lock);
 		if (ent->disabled)
 			goto out;