[PATCH v2] drm/amdgpu: fix null ptr access

[Flora Cui]

check null ptr first before access its element

v2: check adev->pm.dpm_enabled early in amdgpu_debugfs_pm_init()

Signed-off-by: Flora Cui <flora....@amd.com>
---
 drivers/gpu/drm/amd/pm/amdgpu_dpm.c | 2 +-
 drivers/gpu/drm/amd/pm/amdgpu_pm.c  | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c 
b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
index f0daa66f5b3d..5fc33893a68c 100644
--- a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
@@ -463,7 +463,7 @@ int amdgpu_pm_load_smu_firmware(struct amdgpu_device *adev, 
uint32_t *smu_versio
        const struct amd_pm_funcs *pp_funcs = adev->powerplay.pp_funcs;
        int r = 0;
 
-       if (!pp_funcs->load_firmware)
+       if (!pp_funcs || !pp_funcs->load_firmware)
                return 0;
 
        mutex_lock(&adev->pm.mutex);
diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c 
b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
index 1b03ad7a21ad..49a9c6375343 100644
--- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
@@ -3583,6 +3583,9 @@ void amdgpu_debugfs_pm_init(struct amdgpu_device *adev)
        struct drm_minor *minor = adev_to_drm(adev)->primary;
        struct dentry *root = minor->debugfs_root;
 
+       if (!adev->pm.dpm_enabled)
+               return;
+
        debugfs_create_file("amdgpu_pm_info", 0444, root, adev,
                            &amdgpu_debugfs_pm_info_fops);
 
-- 
2.25.1