Fix build warning if drm_panel.h is built with CONFIG_OF=n or CONFIG_DRM_PANEL=n and included without the prerequisite err.h:

./include/drm/drm_panel.h: In function ‘of_drm_find_panel’: ./include/drm/drm_panel.h:203:9: error: implicit declaration of function ‘ERR_PTR’ [-Werror=implicit-function-declaration] return ERR_PTR(-ENODEV); ^~~~~~~ ./include/drm/drm_panel.h:203:9: error: returning ‘int’ from a function with return type ‘struct drm_panel *’ makes pointer from integer without a cast [-Werror=int-conversion] return ERR_PTR(-ENODEV); ^~~~~~~~~~~~~~~~

Fixes: 5fa8e4a22182 ("drm/panel: Make of_drm_find_panel() return an ERR_PTR() instead of NULL") Cc: Boris Brezillon boris.brezillon@bootlin.com Cc: Thierry Reding treding@nvidia.com Signed-off-by: Jani Nikula jani.nikula@intel.com

---

I don't know if there's a combo where this actually fails, so I'm not adding cc: stable. It's just something I hit when playing with other code. --- include/drm/drm_panel.h | 1 + 1 file changed, 1 insertion(+)

diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h index 8c738c0e6e9f..26377836141c 100644 --- a/include/drm/drm_panel.h +++ b/include/drm/drm_panel.h @@ -24,6 +24,7 @@ #ifndef __DRM_PANEL_H__ #define __DRM_PANEL_H__

+#include <linux/err.h> #include <linux/errno.h> #include <linux/list.h>