From: Boris Brezillon <boris.brezillon@bootlin.com>
Date: Wed, 9 May 2018 15:00:41 +0200
Subject: drm/of: Make drm_of_find_panel_or_bridge() fail when the device is
 disabled
Git-commit: 2e64a174179a144742fa70f09803a012aceca476
Patch-mainline: v4.19-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

There's no point searching for a drm_bridge or drm_panel if the OF node
we're pointing has a status property that is not "okay" or "ok". Just
return -ENODEV in this case.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180509130042.9435-4-boris.brezillon@bootlin.com

Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/drm_of.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -239,6 +239,11 @@ int drm_of_find_panel_or_bridge(const st
 	if (!remote)
 		return -ENODEV;
 
+	if (!of_device_is_available(remote)) {
+		of_node_put(remote);
+		return -ENODEV;
+	}
+
 	if (panel) {
 		*panel = of_drm_find_panel(remote);
 		if (!IS_ERR(*panel))