From: Artemy Kovalyov <artemyko@mellanox.com>
Date: Sun, 25 Nov 2018 20:34:26 +0200
Subject: IB/mlx5: Fix page fault handling for MW
Patch-mainline: v4.20-rc5
Git-commit: 75b7b86bdb0df37e08e44b6c1f99010967f81944
References: bsc#1103991 FATE#326007

Memory windows are implemented with an indirect MKey, when a page fault
event comes for a MW Mkey we need to find the MR at the end of the list of
the indirect MKeys by iterating on all items from the first to the last.

The offset calculated during this process has to be zeroed after the first
iteration or the next iteration will start from a wrong address, resulting
incorrect ODP faulting behavior.

Fixes: db570d7deafb ("IB/mlx5: Add ODP support to MW")
Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Moni Shoua <monis@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/hw/mlx5/odp.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/infiniband/hw/mlx5/odp.c
+++ b/drivers/infiniband/hw/mlx5/odp.c
@@ -743,6 +743,7 @@ next_mr:
 			head = frame;
 
 			bcnt -= frame->bcnt;
+			offset = 0;
 		}
 		break;