1 files changed, 9 insertions, 29 deletions

diff --git a/drivers/gpu/drm/drm_platform.c b/drivers/gpu/drm/drm_platform.c
index d5b76f148c12..5314c9d5fef4 100644
--- a/drivers/gpu/drm/drm_platform.c
+++ b/drivers/gpu/drm/drm_platform.c
@@ -68,42 +68,23 @@ err_free:
         return ret;
 }
 
-static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *master)
+int drm_platform_set_busid(struct drm_device *dev, struct drm_master *master)
 {
-        int len, ret, id;
-
-        master->unique_len = 13 + strlen(dev->platformdev->name);
-        master->unique_size = master->unique_len;
-        master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
-
-        if (master->unique == NULL)
-                return -ENOMEM;
+        int id;
 
         id = dev->platformdev->id;
-
-        /* if only a single instance of the platform device, id will be
-         * set to -1.. use 0 instead to avoid a funny looking bus-id:
-         */
-        if (id == -1)
+        if (id < 0)
                 id = 0;
 
-        len = snprintf(master->unique, master->unique_len,
-                        "platform:%s:%02d", dev->platformdev->name, id);
-
-        if (len > master->unique_len) {
-                DRM_ERROR("Unique buffer overflowed\n");
-                ret = -EINVAL;
-                goto err;
-        }
+        master->unique = kasprintf(GFP_KERNEL, "platform:%s:%02d",
+                                                dev->platformdev->name, id);
+        if (!master->unique)
+                return -ENOMEM;
 
+        master->unique_len = strlen(master->unique);
         return 0;
-err:
-        return ret;
 }
-
-static struct drm_bus drm_platform_bus = {
-        .set_busid = drm_platform_set_busid,
-};
+EXPORT_SYMBOL(drm_platform_set_busid);
 
 /**
  * drm_platform_init - Register a platform device with the DRM subsystem
@@ -120,7 +101,6 @@ int drm_platform_init(struct drm_driver *driver, struct platform_device *platfor
 {
         DRM_DEBUG("\n");
 
-        driver->bus = &drm_platform_bus;
         return drm_get_platform_dev(platform_device, driver);
 }
 EXPORT_SYMBOL(drm_platform_init);