linux-kernel - [PATCH 4.19 480/639] drm/panel: make drm

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Message-Id: <20200124093148.439717975@linuxfoundation.org>
Date:   Fri, 24 Jan 2020 10:30:50 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jani Nikula <jani.nikula@...el.com>,
        Thierry Reding <treding@...dia.com>,
        Sam Ravnborg <sam@...nborg.org>, Sean Paul <sean@...rly.run>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 480/639] drm/panel: make drm_panel.h self-contained

From: Jani Nikula <jani.nikula@...el.com>

[ Upstream commit bf3f5e98559360661a3d2af340d46522512c0b00 ]

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")
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
Acked-by: Thierry Reding <treding@...dia.com>
Reviewed-by: Sam Ravnborg <sam@...nborg.org>
Reviewed-by: Sean Paul <sean@...rly.run>
Cc: Boris Brezillon <bbrezillon@...nel.org>
Signed-off-by: Sam Ravnborg <sam@...nborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190718161507.2047-2-sam@ravnborg.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 777814755fa62..675aa1e876ce6 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>
 
-- 
2.20.1