drm/amdgpu: Dynamically initialize IP instance attributes

Dynamically initialize IP instance attributes. This eliminates bugs
stemming from adding new attributes to an IP instance.

Cc: Alex Deucher <Alexander.Deucher@amd.com>
Reported-by: Tom StDenis <tom.stdenis@amd.com>
Fixes: 4d7ba312 ("drm/amdgpu: Add "harvest" to IP discovery sysfs")
Signed-off-by: Luben Tuikov <luben.tuikov@amd.com>
Acked-by: Alex Deucher <Alexander.Deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c

@@ -482,16 +482,7 @@ static struct ip_hw_instance_attr ip_hw_attr[] = {
 	__ATTR_RO(base_addr),
 };
 
-static struct attribute *ip_hw_instance_attrs[] = {
-	&ip_hw_attr[0].attr,
-	&ip_hw_attr[1].attr,
-	&ip_hw_attr[2].attr,
-	&ip_hw_attr[3].attr,
-	&ip_hw_attr[4].attr,
-	&ip_hw_attr[5].attr,
-	&ip_hw_attr[6].attr,
-	NULL,
-};
+static struct attribute *ip_hw_instance_attrs[ARRAY_SIZE(ip_hw_attr) + 1];
 ATTRIBUTE_GROUPS(ip_hw_instance);
 
 #define to_ip_hw_instance(x) container_of(x, struct ip_hw_instance, kobj)
@@ -789,7 +780,7 @@ static int amdgpu_discovery_sysfs_recurse(struct amdgpu_device *adev)
 static int amdgpu_discovery_sysfs_init(struct amdgpu_device *adev)
 {
 	struct kset *die_kset;
-	int res;
+	int res, ii;
 
 	adev->ip_top = kzalloc(sizeof(*adev->ip_top), GFP_KERNEL);
 	if (!adev->ip_top)
@@ -814,6 +805,10 @@ static int amdgpu_discovery_sysfs_init(struct amdgpu_device *adev)
 		goto Err;
 	}
 
+	for (ii = 0; ii < ARRAY_SIZE(ip_hw_attr); ii++)
+		ip_hw_instance_attrs[ii] = &ip_hw_attr[ii].attr;
+	ip_hw_instance_attrs[ii] = NULL;
+
 	res = amdgpu_discovery_sysfs_recurse(adev);
 
 	return res;