This is a note to let you know that I've just added the patch titled
ACPI, APEI: Fixup common access width firmware bug
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
acpi-apei-fixup-common-access-width-firmware-bug.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From f712c71f7b2b43b894d1e92e1b77385fcad8815f Mon Sep 17 00:00:00 2001
From: Jean Delvare <[email protected]>
Date: Tue, 12 Jun 2012 10:43:28 +0200
Subject: ACPI, APEI: Fixup common access width firmware bug
From: Jean Delvare <[email protected]>
commit f712c71f7b2b43b894d1e92e1b77385fcad8815f upstream.
Many firmwares have a common register definition bug where 8-bit
access width is specified for a 32-bit register. Ideally this should
be fixed in the BIOS, but earlier versions of the kernel did not
complain, so fix that up silently.
This closes kernel bug #43282:
https://bugzilla.kernel.org/show_bug.cgi?id=43282
Signed-off-by: Jean Delvare <[email protected]>
Acked-by: Huang Ying <[email protected]>
Acked-by: Gary Hade <[email protected]>
Signed-off-by: Len Brown <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/acpi/apei/apei-base.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/acpi/apei/apei-base.c
+++ b/drivers/acpi/apei/apei-base.c
@@ -586,6 +586,11 @@ static int apei_check_gar(struct acpi_ge
}
*access_bit_width = 1UL << (access_size_code + 2);
+ /* Fixup common BIOS bug */
+ if (bit_width == 32 && bit_offset == 0 && (*paddr & 0x03) == 0 &&
+ *access_bit_width < 32)
+ *access_bit_width = 32;
+
if ((bit_width + bit_offset) > *access_bit_width) {
pr_warning(FW_BUG APEI_PFX
"Invalid bit width + offset in GAR
[0x%llx/%u/%u/%u/%u]\n",
Patches currently in stable-queue which might be from [email protected] are
queue-3.4/acpi-apei-fixup-common-access-width-firmware-bug.patch
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