[PATCH 4.14 02/53] nouveau: Fix build with CONFIG_NOUVEAU_LEGACY_CTX_SUPPORT disabled

From: Greg Kroah-Hartman
Date: Mon Jun 17 2019 - 17:33:19 EST

From: Thomas Backlund <tmb@xxxxxxxxxx>

Not-entirely-upstream-sha1-but-equivalent: bed2dd8421
("drm/ttm: Quick-test mmap offset in ttm_bo_mmap()")

Setting CONFIG_NOUVEAU_LEGACY_CTX_SUPPORT=n (added by commit: b30a43ac7132)
causes the build to fail with:

ERROR: "drm_legacy_mmap" [drivers/gpu/drm/nouveau/nouveau.ko] undefined!

This does not happend upstream as the offending code got removed in:
bed2dd8421 ("drm/ttm: Quick-test mmap offset in ttm_bo_mmap()")

Fix that by adding check for CONFIG_NOUVEAU_LEGACY_CTX_SUPPORT around
the drm_legacy_mmap() call.

Also, as Sven Joachim pointed out, we need to make the check in
for basically all other gpu drivers, especially in upstream kernels
drivers/gpu/drm/ttm/ttm_bo_vm.c as of the upstream commit bed2dd8421.

NOTE. This is a minimal stable-only fix for trees where b30a43ac7132 is
backported as the build error affects nouveau only.

Fixes: b30a43ac7132 ("drm/nouveau: add kconfig option to turn off nouveau
legacy contexts. (v3)")
Signed-off-by: Thomas Backlund <tmb@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Sven Joachim <svenjoac@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
drivers/gpu/drm/nouveau/nouveau_ttm.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/nouveau/nouveau_ttm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_ttm.c
@@ -273,7 +273,11 @@ nouveau_ttm_mmap(struct file *filp, stru
struct nouveau_drm *drm = nouveau_drm(file_priv->minor->dev);

if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
return drm_legacy_mmap(filp, vma);
+ return -EINVAL;

return ttm_bo_mmap(filp, vma, &drm->ttm.bdev);