Calling directly into the fbdev stack only works when the
fbdev layer is built into the kernel as well, or both are
loadable modules:

drivers/gpu/drm/nouveau/nouveau_drm.o: in function `nouveau_drm_probe':
nouveau_drm.c:(.text+0x1f90): undefined reference to 
`remove_conflicting_pci_framebuffers'

The change seems to have been intentional, so add an explicit
dependency here but allow it to still be compiled if FBDEV
is completely disabled.

Fixes: 2dd4d163cd9c ("drm/nouveau: remove open-coded version of 
remove_conflicting_pci_framebuffers()")
Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 drivers/gpu/drm/nouveau/Kconfig       | 1 +
 drivers/gpu/drm/nouveau/nouveau_drm.c | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/Kconfig b/drivers/gpu/drm/nouveau/Kconfig
index 980ed09bd7f6..8c640f003358 100644
--- a/drivers/gpu/drm/nouveau/Kconfig
+++ b/drivers/gpu/drm/nouveau/Kconfig
@@ -18,6 +18,7 @@ config DRM_NOUVEAU
        select THERMAL if ACPI && X86
        select ACPI_VIDEO if ACPI && X86
        select SND_HDA_COMPONENT if SND_HDA_CORE
+       depends on FBDEV || !FBDEV
        help
          Choose this option for open-source NVIDIA support.
 
diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c 
b/drivers/gpu/drm/nouveau/nouveau_drm.c
index eb10c80ed853..e8560444ab57 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -697,7 +697,8 @@ static int nouveau_drm_probe(struct pci_dev *pdev,
        nvkm_device_del(&device);
 
        /* Remove conflicting drivers (vesafb, efifb etc). */
-       ret = remove_conflicting_pci_framebuffers(pdev, "nouveaufb");
+       if (IS_ENABLED(CONFIG_FBDEV))
+               ret = remove_conflicting_pci_framebuffers(pdev, "nouveaufb");
        if (ret)
                return ret;
 
-- 
2.26.2

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