From 40d9609effc7c14c119c54a27af3e62be2a383d9 Mon Sep 17 00:00:00 2001
From: Philip Elcan <pelcan@nvidia.com>
Date: Thu, 16 May 2019 11:23:19 -0400
Subject: [PATCH] gpu: nvgpu: mm: fix 4.7 violation in page_table

MISRA 4.7 requires checking errors returned by functions. This fixes a
case where the error information wasn't being checked before performing
other operations.

JIRA NVGPU-3340

Signed-off-by: Philip Elcan <pelcan@nvidia.com>
Change-Id: I480fde75a07f779450096533ab29c76975aff092
Reviewed-on: https://git-master.nvidia.com/r/2120489
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
---
 drivers/gpu/nvgpu/common/mm/gmmu/page_table.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/nvgpu/common/mm/gmmu/page_table.c b/drivers/gpu/nvgpu/common/mm/gmmu/page_table.c
index aefcaa0dd..b506bc280 100644
--- a/drivers/gpu/nvgpu/common/mm/gmmu/page_table.c
+++ b/drivers/gpu/nvgpu/common/mm/gmmu/page_table.c
@@ -741,6 +741,9 @@ static int nvgpu_gmmu_update_page_table(struct vm_gk20a *vm,
 					      virt_addr,
 					      length,
 					      attrs);
+	if (err != 0) {
+		nvgpu_err(g, "nvgpu_gmmu_do_update_page_table returned error");
+	}
 
 	nvgpu_mb();