linux-kernel - [ 048/109] ACPI, APEI: Fixup common access width firmware bug

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Message-Id: <20120807222047.297200063@linuxfoundation.org>
Date:	Tue,  7 Aug 2012 15:35:07 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Jean Delvare <jdelvare@...e.de>,
	Huang Ying <ying.huang@...el.com>,
	Gary Hade <garyhade@...ibm.com>,
	Len Brown <len.brown@...el.com>
Subject: [ 048/109] ACPI, APEI: Fixup common access width firmware bug

From: Greg KH <gregkh@...uxfoundation.org>

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jean Delvare <jdelvare@...e.de>

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 <jdelvare@...e.de>
Acked-by: Huang Ying <ying.huang@...el.com>
Acked-by: Gary Hade <garyhade@...ibm.com>
Signed-off-by: Len Brown <len.brown@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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",


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