drm: Introduce drm_dev_set_unique()

[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / gpu / drm / drm_ioctl.c

diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index f4dc9b7..22f50f8 100644 (file)
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -72,9 +72,6 @@ static void
 drm_unset_busid(struct drm_device *dev,
                struct drm_master *master)
 {
-       kfree(dev->devname);
-       dev->devname = NULL;
-
        kfree(master->unique);
        master->unique = NULL;
        master->unique_len = 0;
@@ -130,13 +127,25 @@ static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
        if (master->unique != NULL)
                drm_unset_busid(dev, master);
 
-       ret = dev->driver->bus->set_busid(dev, master);
-       if (ret)
-               goto err;
+       if (dev->driver->bus && dev->driver->bus->set_busid) {
+               ret = dev->driver->bus->set_busid(dev, master);
+               if (ret) {
+                       drm_unset_busid(dev, master);
+                       return ret;
+               }
+       } else {
+               if (WARN(dev->unique == NULL,
+                        "No drm_bus.set_busid() implementation provided by "
+                        "%ps. Use drm_dev_set_unique() to set the unique "
+                        "name explicitly.", dev->driver))
+                       return -EINVAL;
+
+               master->unique = kstrdup(dev->unique, GFP_KERNEL);
+               if (master->unique)
+                       master->unique_len = strlen(dev->unique);
+       }
+
        return 0;
-err:
-       drm_unset_busid(dev, master);
-       return ret;
 }
 
 /**