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Subject[ 114/128] drivers/firmware/dmi_scan.c: check dmi version when get system uuid
3.2-stable review patch.  If anyone has any objections, please let me know.

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

From: Zhenzhong Duan <zhenzhong.duan@oracle.com>

commit f1d8e614d74b09531b9a85e812485340f3df7b1c upstream.

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

[akpm@linux-foundation.org: tweak code comment]
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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/firmware/dmi_scan.c | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index b298158..3714e3c 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 +175,15 @@ 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 little-endian encoded. The specification
+ * says that this is the defacto standard.
+ */
+ if (dmi_ver >= 0x0206)
+ sprintf(s, "%pUL", d);
+ else
+ sprintf(s, "%pUB", d);

dmi_ident[slot] = s;
}
@@ -414,6 +425,7 @@ 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);



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