drm/amd/pm: Init pm_attr_list when dpm is disabled

[Why]
In SRIOV multi-vf, dpm is always disabled, and pm_attr_list won't
be initialized. There will be a NULL pointer call trace after
removing the dpm check condition in amdgpu_pm_sysfs_fini.
BUG: kernel NULL pointer dereference, address: 0000000000000000
RIP: 0010:amdgpu_device_attr_remove_groups+0x20/0x90 [amdgpu]
Call Trace:
  <TASK>
  amdgpu_pm_sysfs_fini+0x2f/0x40 [amdgpu]
  amdgpu_device_fini_hw+0xdf/0x290 [amdgpu]

[How]
List pm_attr_list should be initialized when dpm is disabled.

Fixes: a6ad27cec585fe ("drm/amd/pm: Remove redundant check condition")
Signed-off-by: ZhenGuo Yin <zhenguo.yin@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
index 948cc75376f8bc0607719a5253082a697e77be8f..236657eece4772f9fed32aaacf9ead556dece300 100644 (file)
--- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
@@ -3362,11 +3362,11 @@ int amdgpu_pm_sysfs_init(struct amdgpu_device *adev)
        if (adev->pm.sysfs_initialized)
                return 0;
 
+       INIT_LIST_HEAD(&adev->pm.pm_attr_list);
+
        if (adev->pm.dpm_enabled == 0)
                return 0;
 
-       INIT_LIST_HEAD(&adev->pm.pm_attr_list);
-
        adev->pm.int_hwmon_dev = hwmon_device_register_with_groups(adev->dev,
                                                                   DRIVER_NAME, adev,
                                                                   hwmon_groups);