Commit-ID: c2999c281ea2d2ebbdfce96cecc7b52e2ae7c406
Gitweb: https://git.kernel.org/tip/c2999c281ea2d2ebbdfce96cecc7b52e2ae7c406
Author: Ard Biesheuvel <[email protected]>
AuthorDate: Thu, 28 Mar 2019 20:34:26 +0100
Committer: Ingo Molnar <[email protected]>
CommitDate: Fri, 29 Mar 2019 07:34:59 +0100
efifb: Omit memory map check on legacy boot
Since the following commit:
38ac0287b7f4 ("fbdev/efifb: Honour UEFI memory map attributes when mapping
the FB")
efifb_probe() checks its memory range via efi_mem_desc_lookup(),
and this leads to a spurious error message:
EFI_MEMMAP is not enabled
at every boot on KVM. This is quite annoying since the error message
appears even if you set "quiet" boot option.
Since this happens on legacy boot, which strangely enough exposes
a EFI framebuffer via screen_info, let's double check that we are
doing an EFI boot before attempting to access the EFI memory map.
Reported-by: Takashi Iwai <[email protected]>
Tested-by: Takashi Iwai <[email protected]>
Signed-off-by: Ard Biesheuvel <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Matt Fleming <[email protected]>
Cc: Peter Jones <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
---
drivers/video/fbdev/efifb.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c
index ba906876cc45..9e529cc2b4ff 100644
--- a/drivers/video/fbdev/efifb.c
+++ b/drivers/video/fbdev/efifb.c
@@ -464,7 +464,8 @@ static int efifb_probe(struct platform_device *dev)
info->apertures->ranges[0].base = efifb_fix.smem_start;
info->apertures->ranges[0].size = size_remap;
- if (!efi_mem_desc_lookup(efifb_fix.smem_start, &md)) {
+ if (efi_enabled(EFI_BOOT) &&
+ !efi_mem_desc_lookup(efifb_fix.smem_start, &md)) {
if ((efifb_fix.smem_start + efifb_fix.smem_len) >
(md.phys_addr + (md.num_pages << EFI_PAGE_SHIFT))) {
pr_err("efifb: video memory @ 0x%lx spans multiple EFI
memory regions\n",
