linux-kernel - [PATCH 3.16.y-ckt 001/142] Revert "firmware: dmi_scan: Fix UUID endianness for SMBIOS >= 2.6"

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Date:	Tue, 22 Mar 2016 10:38:50 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 001/142] Revert "firmware: dmi_scan: Fix UUID endianness for SMBIOS >= 2.6"

3.16.7-ckt26 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Luis Henriques <luis.henriques@...onical.com>

This reverts commit 0f7b4f7914e450b1bcffdbd26bbf35ee304cbfea, which was
commit ff4319dc7cd58c92b389960e375038335d157a60 upstream.

This commit introduced a regression in this kernel.  Commit 95be58df74a5
("firmware: dmi_scan: Use full dmi version for SMBIOS3") added support for
SMBIOS3.  However, this was not backport to this kernel version, and thus
commit ff4319dc7cd5 should have not been applied.

BugLink: https://bugs.launchpad.net/bugs/1551419
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/firmware/dmi_scan.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 48142b88e672..35286fe52823 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -493,7 +493,6 @@ static int __init dmi_present(const u8 *buf)
 			dmi_ver = smbios_ver;
 		else
 			dmi_ver = (buf[14] & 0xF0) << 4 | (buf[14] & 0x0F);
-		dmi_ver <<= 8;
 		dmi_num = (buf[13] << 8) | buf[12];
 		dmi_len = (buf[7] << 8) | buf[6];
 		dmi_base = (buf[11] << 24) | (buf[10] << 16) |
@@ -502,10 +501,10 @@ static int __init dmi_present(const u8 *buf)
 		if (dmi_walk_early(dmi_decode) == 0) {
 			if (smbios_ver) {
 				pr_info("SMBIOS %d.%d present.\n",
-					dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);
+				       dmi_ver >> 8, dmi_ver & 0xFF);
 			} else {
 				pr_info("Legacy DMI %d.%d present.\n",
-					dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);
+				       dmi_ver >> 8, dmi_ver & 0xFF);
 			}
 			dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
 			printk(KERN_DEBUG "DMI: %s\n", dmi_ids_string);