hyperv: avoid dependency on screen_info

The two hyperv framebuffer drivers (hyperv_fb or hyperv_drm_drv) access the
global screen_info in order to take over from the sysfb framebuffer, which
in turn could be handled by simplefb, simpledrm or efifb. Similarly, the
vmbus_drv code marks the original EFI framebuffer as reserved, but this
is not required if there is no sysfb.

As a preparation for making screen_info itself more local to the sysfb
helper code, add a compile-time conditional in all three files that relate
to hyperv fb and just skip this code if there is no sysfb that needs to
be unregistered.

Reviewed-by: Javier Martinez Canillas <[email protected]>
Acked-by: Helge Deller <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_drv.c b/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
index 8026118c6e03..9a44a00effc2 100644
--- a/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
+++ b/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
@@ -73,9 +73,10 @@ static int hyperv_setup_vram(struct hyperv_drm_device *hv,
 	struct drm_device *dev = &hv->dev;
 	int ret;
 
-	drm_aperture_remove_conflicting_framebuffers(screen_info.lfb_base,
-						     screen_info.lfb_size,
-						     &hyperv_driver);
+	if (IS_ENABLED(CONFIG_SYSFB))
+		drm_aperture_remove_conflicting_framebuffers(screen_info.lfb_base,
+							     screen_info.lfb_size,
+							     &hyperv_driver);
 
 	hv->fb_size = (unsigned long)hv->mmio_megabytes * 1024 * 1024;