gpu: nvgpu: nvgpu_pmu_disable_elpg() status check

- Added status check for nvgpu_pmu_disable_elpg() return value
 & prints error information upon failure.
- Below CID's are due to missing status check of function
 nvgpu_pmu_disable_elpg() return value, so this CL helps to fix it
 2624546
 2624547
 2624548

Bug 200291879

Change-Id: I263fc6bc9e2667af478bfd7160fe205167556f99
Signed-off-by: Mahantesh Kumbar <mkumbar@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1565998
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/common/pmu/pmu.c b/drivers/gpu/nvgpu/common/pmu/pmu.c
index 1a9061e8..f0df6e14 100644
--- a/drivers/gpu/nvgpu/common/pmu/pmu.c
+++ b/drivers/gpu/nvgpu/common/pmu/pmu.c
@@ -499,7 +499,8 @@ int nvgpu_pmu_destroy(struct gk20a *g)
         nvgpu_pmu_get_pg_stats(g,
                 PMU_PG_ELPG_ENGINE_ID_GRAPHICS, &pg_stat_data);
 
-        nvgpu_pmu_disable_elpg(g);
+        if (nvgpu_pmu_disable_elpg(g))
+                nvgpu_err(g, "failed to set disable elpg");
         pmu->initialized = false;
 
         /* update the s/w ELPG residency counters */