From: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Date: Thu, 25 Oct 2012 01:15:07 +0000 (+1100)
Subject: drivers/firmware/dmi_scan.c: check dmi version when get system uuid
X-Git-Tag: next-20121029~1^2~55
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f1d5c96ed22b389da7e3279b3dc9b480d4bea885;p=karo-tx-linux.git

drivers/firmware/dmi_scan.c: check dmi version when get system uuid

As of version 2.6 of the SMBIOS specification, the first 3
fields of the UUID are supposed to be little-endian encoded.

Also a minor fix to match variable meaning and mute checkpatch.pl

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Cc: Feng Jin <joe.jin@oracle.com>
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index b298158cb922..efa49cb6da4a 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -16,6 +16,7 @@
  */
 static char dmi_empty_string[] = "        ";
 
+static u16  __initdata dmi_ver;
 /*
  * Catch too early calls to dmi_check_system():
  */
@@ -161,8 +162,10 @@ static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int inde
 		return;
 
 	for (i = 0; i < 16 && (is_ff || is_00); i++) {
-		if(d[i] != 0x00) is_ff = 0;
-		if(d[i] != 0xFF) is_00 = 0;
+		if (d[i] != 0x00)
+			is_00 = 0;
+		if (d[i] != 0xFF)
+			is_ff = 0;
 	}
 
 	if (is_ff || is_00)
@@ -172,7 +175,16 @@ static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int inde
 	if (!s)
 		return;
 
-	sprintf(s, "%pUB", d);
+	/*
+	 * As of version 2.6 of the SMBIOS specification, the first 3
+	 * fields of the UUID are supposed to be encoded on little-endian.
+	 * The specification says that this is the defacto standard,
+	 * update kernel code to match dmidecode data.
+	*/
+	if (dmi_ver >= 0x0206)
+		sprintf(s, "%pUL", d);
+	else
+		sprintf(s, "%pUB", d);
 
         dmi_ident[slot] = s;
 }
@@ -414,6 +426,7 @@ static int __init dmi_present(const char __iomem *p)
 		 * DMI version 0.0 means that the real version is taken from
 		 * the SMBIOS version, which we don't know at this point.
 		 */
+		dmi_ver = (buf[14] & 0xf0) << 4 | (buf[14] & 0x0f);
 		if (buf[14] != 0)
 			printk(KERN_INFO "DMI %d.%d present.\n",
 			       buf[14] >> 4, buf[14] & 0xF);