[PATCH v2] efi/bgrt: Accept BGRT tables with a version of 0

[PATCH v2] efi/bgrt: Accept BGRT tables with a version of 0

[Hans de Goede]

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.

Cc: stable@vger.kernel.org
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1791273
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v2:
- Simply always accept version 0 everywhere as suggested by Ard
---
 drivers/firmware/efi/efi-bgrt.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/efi/efi-bgrt.c b/drivers/firmware/efi/efi-bgrt.c
index b07c17643210..6aafdb67dbca 100644
--- a/drivers/firmware/efi/efi-bgrt.c
+++ b/drivers/firmware/efi/efi-bgrt.c
@@ -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;
-- 
2.23.0