X-Git-Url: http://git.monstr.eu/?a=blobdiff_plain;f=drivers%2Fgpu%2Fdrm%2Fdrm_dp_aux_dev.c;h=06b374cae95636640c41a311f8724f3a4847dc8e;hb=432f51e7deedadceaf99a953a6f0a7b30c8155f9;hp=e25181bf2c480c940e53921ebd8cf94b10dae7ad;hpb=6755f4563144e38f375f43dbb01926fd4ce08620;p=linux-2.6-microblaze.git

diff --git a/drivers/gpu/drm/drm_dp_aux_dev.c b/drivers/gpu/drm/drm_dp_aux_dev.c
index e25181bf2c48..06b374cae956 100644
--- a/drivers/gpu/drm/drm_dp_aux_dev.c
+++ b/drivers/gpu/drm/drm_dp_aux_dev.c
@@ -278,6 +278,12 @@ void drm_dp_aux_unregister_devnode(struct drm_dp_aux *aux)
 	if (!aux_dev) /* attach must have failed */
 		return;
 
+	/*
+	 * As some AUX adapters may exist as platform devices which outlive their respective DRM
+	 * devices, we clear drm_dev to ensure that we never accidentally reference a stale pointer
+	 */
+	aux->drm_dev = NULL;
+
 	mutex_lock(&aux_idr_mutex);
 	idr_remove(&aux_idr, aux_dev->index);
 	mutex_unlock(&aux_idr_mutex);