On gen2 HyperV VM, hyperv_fb will remove the old framebuffer, the
new allocated framebuffer address could be at a differnt location,
and it's no longer VGA framebuffer. Update screen_info
so that after kexec, kernel won't try to reuse the old invalid
framebuffer address as VGA.
Signed-off-by: Kairui Song <kasong@xxxxxxxxxx>
---
drivers/video/fbdev/hyperv_fb.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c
index 02411d89cb46..e36fb1a0ecdb 100644
--- a/drivers/video/fbdev/hyperv_fb.c
+++ b/drivers/video/fbdev/hyperv_fb.c
@@ -1114,8 +1114,15 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
getmem_done:
remove_conflicting_framebuffers(info->apertures,
KBUILD_MODNAME, false);
- if (!gen2vm)
+
+ if (gen2vm) {
+ /* framebuffer is reallocated, clear screen_info to avoid misuse from kexec */
+ screen_info.lfb_size = 0;
+ screen_info.lfb_base = 0;
+ screen_info.orig_video_isVGA = 0;
+ } else {
pci_dev_put(pdev);
+ }
kfree(info->apertures);
return 0;
--
2.28.0
