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efi/bgrt: Accept BGRT tables with a version of 0 

Some (somewhat older) laptops have a correct BGRT table, except that the
version field is 0 instead of 1.

This has been seen on several Ivy Bridge based Lenovo models.

For now the spec. only defines version 1, so it is reasonably safe to
assume that tables with a version of 0 really are version 1 too,
which is what this commit does so that the BGRT table will be accepted
by the kernel on laptop models with this issue.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20200131130623.33875-1-hdegoede@redhat.com
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Hans de Goede 2020-01-31 14:06:23 +01:00 committed by Ard Biesheuvel
parent f32ea1cd12
commit 55087c5713
1 changed files with 6 additions and 1 deletions
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7
drivers/firmware/efi/efi-bgrt.c
View File

@ -42,7 +42,12 @@ void __init efi_bgrt_init(struct acpi_table_header *table)
return;
}
*bgrt = *(struct acpi_table_bgrt *)table;
if (bgrt->version != 1) {
/*
* Only version 1 is defined but some older laptops (seen on Lenovo
* Ivy Bridge models) have a correct version 1 BGRT table with the
* version set to 0, so we accept version 0 and 1.
*/
if (bgrt->version > 1) {
pr_notice("Ignoring BGRT: invalid version %u (expected 1)\n",
bgrt->version);
goto out;