gpu: nvgpu: check null when call clk_round_rate

Bug 1726406

Change-Id: Ia03b0a174e92b28c471164cefcde514e6db94bdf
Signed-off-by: Richard Zhao <rizhao@nvidia.com>
Reviewed-on: http://git-master/r/1002700
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vladislav Buzov <vbuzov@nvidia.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.c b/drivers/gpu/nvgpu/gk20a/gk20a.c
index bbcf60e3..d5f12f2b 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.c
@@ -2031,7 +2031,8 @@ int gk20a_init_gpu_characteristics(struct gk20a *g)
 
         gpu->map_buffer_batch_limit = 256;
 
-        gpu->max_freq = platform->clk_round_rate(g->dev, UINT_MAX);
+        if (platform->clk_round_rate)
+                gpu->max_freq = platform->clk_round_rate(g->dev, UINT_MAX);
 
         return 0;
 }