[RESEND][SRU][A][PATCH 1/1] UBUNTU: SAUCE: drm: hibmc: Initialize the hibmc_bo_driver.io_mem_pfn

[Daniel Axtens]

From: Michal Srb <msrb at suse.com>

BugLink: https://bugs.launchpad.net/bugs/1738334

The io_mem_pfn field was added in ea642c3216cb2a60d1c0e760ae47ee85c9c16447 and
is used unconditionally. Most drivers were updated to set it to the default
implementation ttm_bo_default_io_mem_pfn, but hibmc was not.

This fixes crash in ttm_bo_vm_fault when hibmc driver is used.

Signed-off-by: Michal Srb <msrb at suse.com>
(cherry-picked from https://lists.freedesktop.org/archives/dri-devel/2017-November/159002.html)
[upstream fix at
  https://lists.freedesktop.org/archives/dri-devel/2017-December/161184.html
  is quite intrusive - this is the minimal fix]
Signed-off-by: Daniel Axtens <daniel.axtens at canonical.com>
---
 drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
index ac457c779caa..1a6c2a34771a 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
@@ -243,6 +243,7 @@ struct ttm_bo_driver hibmc_bo_driver = {
 	.verify_access		= hibmc_bo_verify_access,
 	.io_mem_reserve		= &hibmc_ttm_io_mem_reserve,
 	.io_mem_free		= NULL,
+	.io_mem_pfn		= ttm_bo_default_io_mem_pfn,
 };
 
 int hibmc_mm_init(struct hibmc_drm_private *hibmc)
-- 
2.11.0