[PATCH 5.14 399/849] drm: fb_helper: fix CONFIG_FB dependency

Greg Kroah-Hartman
2021-11-15T22:57:51Z

From: Arnd Bergmann <arnd@arndb.de>

[ Upstream commit 606b102876e3741851dfb09d53f3ee57f650a52c ]

With CONFIG_FB=m and CONFIG_DRM=y, we get a link error in the fb helper:

aarch64-linux-ld: drivers/gpu/drm/drm_fb_helper.o: in function `drm_fb_helper_alloc_fbi':
(.text+0x10cc): undefined reference to `framebuffer_alloc'

Tighten the dependency so it is only allowed in the case that DRM can
link against FB.

Fixes: f611b1e7624c ("drm: Avoid circular dependencies for CONFIG_FB")
Link: https://lore.kernel.org/all/20210721152211.2706171-1-arnd@kernel.org/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210927142816.2069269-1-arnd@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 7ff89690a976a..061f4382c796e 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -98,7 +98,7 @@ config DRM_DEBUG_DP_MST_TOPOLOGY_REFS
config DRM_FBDEV_EMULATION
bool "Enable legacy fbdev support for your modesetting driver"
depends on DRM
- depends on FB
+ depends on FB=y || FB=DRM
select DRM_KMS_HELPER
select FB_CFB_FILLRECT
select FB_CFB_COPYAREA
--
2.33.0