gpu: nvgpu: Fix mutex MISRA 17.7 violations

MISRA Rule-17.7 requires the return value of all functions to be used.
Fix is either to use the return value or change the function to return
void. This patch contains fix for calls to nvgpu_mutex_init and
improves related error handling.

JIRA NVGPU-677

Change-Id: I609fa138520cc7ccfdd5aa0e7fd28c8ca0b3a21c
Signed-off-by: Nicolas Benech <nbenech@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1805598
Reviewed-by: svc-misra-checker <svc-misra-checker@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>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/gv11b/mm_gv11b.c b/drivers/gpu/nvgpu/gv11b/mm_gv11b.c
index 73b7dae7..ceadc1c1 100644
--- a/drivers/gpu/nvgpu/gv11b/mm_gv11b.c
+++ b/drivers/gpu/nvgpu/gv11b/mm_gv11b.c
@@ -167,11 +167,15 @@ static void gv11b_mm_mmu_fault_setup_hw(struct gk20a *g)
 
 static int gv11b_mm_mmu_fault_setup_sw(struct gk20a *g)
 {
-        int err;
+        int err = 0;
 
         nvgpu_log_fn(g, " ");
 
-        nvgpu_mutex_init(&g->mm.hub_isr_mutex);
+        err = nvgpu_mutex_init(&g->mm.hub_isr_mutex);
+        if (err != 0) {
+                nvgpu_err(g, "Error in hub_isr_mutex initialization");
+                return err;
+        }
 
         err = gv11b_mm_mmu_fault_info_buf_init(g);