gpu: nvgpu: Fix null ptr in gm20b_tegra_postscale()

If devfreq governor is called from a timer during boot it is
possible that gm20b_tegra_postscale() gets called before we have
called gk20a_tegra_scale_init(). This change adds an explicit null ptr
check to prevent any null ptr dereference.

Bug 1954269

Change-Id: I4ebb6c702175b99af2862169f76623e24256b1ed
Signed-off-by: Peter Boonstoppel <pboonstoppel@nvidia.com>
Reviewed-on: https://git-master/r/1514262
GVS: Gerrit_Virtual_Submit
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/platform_gk20a_tegra.c b/drivers/gpu/nvgpu/common/linux/platform_gk20a_tegra.c
index 19a05c90..2c1709ea 100644
--- a/drivers/gpu/nvgpu/common/linux/platform_gk20a_tegra.c
+++ b/drivers/gpu/nvgpu/common/linux/platform_gk20a_tegra.c
@@ -303,7 +303,7 @@ static void gm20b_tegra_postscale(struct device *dev, unsigned long freq)
         struct gk20a_emc_params *emc_params;
         unsigned long emc_rate;
 
-        if (!profile)
+        if (!profile || !profile->private_data)
                 return;
 
         emc_params = profile->private_data;