1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_platform.c b/drivers/gpu/drm/drm_platform.c
index 460e9a3afa8d..92d1d0fb7b75 100644
--- a/drivers/gpu/drm/drm_platform.c
+++ b/drivers/gpu/drm/drm_platform.c
@@ -53,6 +53,8 @@ int drm_get_platform_dev(struct platform_device *platdev,
         dev->platformdev = platdev;
         dev->dev = &platdev->dev;
 
+        mutex_lock(&drm_global_mutex);
+
         ret = drm_fill_in_dev(dev, NULL, driver);
 
         if (ret) {
@@ -87,6 +89,8 @@ int drm_get_platform_dev(struct platform_device *platdev,
 
         list_add_tail(&dev->driver_item, &driver->device_list);
 
+        mutex_unlock(&drm_global_mutex);
+
         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
                  driver->name, driver->major, driver->minor, driver->patchlevel,
                  driver->date, dev->primary->index);
@@ -100,6 +104,7 @@ err_g2:
                 drm_put_minor(&dev->control);
 err_g1:
         kfree(dev);
+        mutex_unlock(&drm_global_mutex);
         return ret;
 }
 EXPORT_SYMBOL(drm_get_platform_dev);