From: Andres Rodriguez <andresx7@gmail.com>
Date: Thu, 13 Apr 2017 13:55:41 -0400
Subject: drm/amdgpu: fix kgd_hqd_load failing to update shadow_wptr
Git-commit: 8ae0d2b8a03dc44d72dd3cccb2a78ec89518bebf
Patch-mainline: v4.13-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

The return value from copy_form_user is 0 for the success case.

Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Andres Rodriguez <andresx7@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v8.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v8.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v8.c
@@ -252,7 +252,7 @@ static int kgd_hqd_load(struct kgd_dev *
 	m = get_mqd(mqd);
 
 	valid_wptr = copy_from_user(&shadow_wptr, wptr, sizeof(shadow_wptr));
-	if (valid_wptr > 0)
+	if (valid_wptr == 0)
 		m->cp_hqd_pq_wptr = shadow_wptr;
 
 	acquire_queue(kgd, pipe_id, queue_id);