gpu: nvgpu: Check return code in gp10b_get_pde0_pgsz()

nvgpu_mem_begin() needs to have it's return code checked to
make sure that it did not fail.

Coverity defect id: 2883904
Bug 200291879

Change-Id: Ic845a73439a905997a1f871708b1f847f5b93293
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1681249
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gp10b/mm_gp10b.c b/drivers/gpu/nvgpu/gp10b/mm_gp10b.c
index 43d9fd28..978b6f50 100644
--- a/drivers/gpu/nvgpu/gp10b/mm_gp10b.c
+++ b/drivers/gpu/nvgpu/gp10b/mm_gp10b.c
@@ -345,7 +345,9 @@ static enum gmmu_pgsz_gk20a gp10b_get_pde0_pgsz(struct gk20a *g,
         if (!pd->mem)
                 return pgsz;
 
-        nvgpu_mem_begin(g, pd->mem);
+        if (nvgpu_mem_begin(g, pd->mem))
+                return pgsz;
+
         for (i = 0; i < GP10B_PDE0_ENTRY_SIZE >> 2; i++)
                 pde_v[i] = nvgpu_mem_rd32(g, pd->mem, pde_offset + i);
         nvgpu_mem_end(g, pd->mem);