[PATCH] drm/amd/pm: fix variable dereferenced issue in amdgpu_device_attr_create()

[Yang Wang]

- fix variable ('attr') dereferenced issue.
- using condition check instead of BUG_ON().

Fixes: 4e01847c38f7 ("drm/amdgpu: optimize amdgpu device attribute code")

Cc: Dan Carpenter <dan.carpen...@linaro.org>
Signed-off-by: Yang Wang <kevinyang.w...@amd.com>
---
 drivers/gpu/drm/amd/pm/amdgpu_pm.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c 
b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
index 3922dd274f30..383b2b778456 100644
--- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
@@ -2171,15 +2171,19 @@ static int amdgpu_device_attr_create(struct 
amdgpu_device *adev,
                                     uint32_t mask, struct list_head *attr_list)
 {
        int ret = 0;
-       struct device_attribute *dev_attr = &attr->dev_attr;
-       const char *name = dev_attr->attr.name;
        enum amdgpu_device_attr_states attr_states = ATTR_STATE_SUPPORTED;
        struct amdgpu_device_attr_entry *attr_entry;
+       struct device_attribute *dev_attr;
+       const char *name;
 
        int (*attr_update)(struct amdgpu_device *adev, struct 
amdgpu_device_attr *attr,
                           uint32_t mask, enum amdgpu_device_attr_states 
*states) = default_attr_update;
 
-       BUG_ON(!attr);
+       if (!attr)
+               return -EINVAL;
+
+       dev_attr = &attr->dev_attr;
+       name = dev_attr->attr.name;
 
        attr_update = attr->attr_update ? attr->attr_update : 
default_attr_update;
 
-- 
2.34.1