[AMD Official Use Only]
For the patch with power code change, we usually have the patch title prefixed with "drm/amd/pm".
With that fixed, the patch is reviewed-by: Evan Quan <evan.quan@xxxxxxx>
> -----Original Message-----
> From: Cui, Flora <Flora.Cui@xxxxxxx>
> Sent: Friday, January 14, 2022 10:54 AM
> To: Quan, Evan <Evan.Quan@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: Cui, Flora <Flora.Cui@xxxxxxx>
> Subject: [PATCH v2] drm/amdgpu: fix null ptr access
>
> 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.cui@xxxxxxx>
> ---
> 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
