hyperv-fb: kick off efifb early

Remove firmware framebuffer before initializing hyperv-fb.  Needed
on gen2 virtual machines.   Letting register_framebuffer handle the
switchover results in efifb still being active while hyperv graphics
are initialized, which in turn can make the linux kernel hang.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Acked-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/video/hyperv_fb.c b/drivers/video/hyperv_fb.c
index b7b3dd0ab675..e23392ec5af3 100644
--- a/drivers/video/hyperv_fb.c
+++ b/drivers/video/hyperv_fb.c
@@ -679,6 +679,8 @@ static int hvfb_getmem(struct fb_info *info)
         if (gen2vm) {
                 info->apertures->ranges[0].base = screen_info.lfb_base;
                 info->apertures->ranges[0].size = screen_info.lfb_size;
+                remove_conflicting_framebuffers(info->apertures,
+                                                KBUILD_MODNAME, false);
         } else {
                 info->apertures->ranges[0].base = pci_resource_start(pdev, 0);
                 info->apertures->ranges[0].size = pci_resource_len(pdev, 0);