gpu: nvgpu: Add NULL pointer check to debug code

nvgpu exposes debug dump functionality. Currently this function
misses NULL pointer checks and therefore in cases where the driver
is compiled but the device is disabled, the driver crashes kernel.

This patch adds the missing NULL pointer check.

Change-Id: I32acb5cad62b2a29603d6439a5c7e45e016235dd
Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Reviewed-on: http://git-master/r/599370
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Mohan Nimaje <mnimaje@nvidia.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/debug_gk20a.c b/drivers/gpu/nvgpu/gk20a/debug_gk20a.c
index 676b493b..602d713b 100644
--- a/drivers/gpu/nvgpu/gk20a/debug_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/debug_gk20a.c
@@ -252,8 +252,12 @@ void gk20a_debug_dump_device(struct platform_device *pdev)
         };
 
         /* Dump the first device if no info is provided */
-        if (!pdev && gk20a_device)
+        if (!pdev) {
+                if (!gk20a_device)
+                        return;
+
                 pdev = gk20a_device;
+        }
 
         gk20a_debug_show_dump(pdev, &o);
 }