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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

[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>
This commit is contained in:
Zhenzhong Duan 2012-12-20 15:05:13 -08:00 committed by Linus Torvalds
parent 038b358e55
commit f1d8e614d7
1 changed files with 15 additions and 3 deletions
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18
drivers/firmware/dmi_scan.c
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@ -16,6 +16,7 @@
*/ */
static char dmi_empty_string[] = " "; static char dmi_empty_string[] = " ";
static u16 __initdata dmi_ver;
/* /*
* Catch too early calls to dmi_check_system(): * 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; return;
for (i = 0; i < 16 && (is_ff || is_00); i++) { for (i = 0; i < 16 && (is_ff || is_00); i++) {
if(d[i] != 0x00) is_ff = 0; if (d[i] != 0x00)
if(d[i] != 0xFF) is_00 = 0; is_00 = 0;
if (d[i] != 0xFF)
is_ff = 0;
} }
if (is_ff || is_00) 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) if (!s)
return; 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; 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 * DMI version 0.0 means that the real version is taken from
* the SMBIOS version, which we don't know at this point. * the SMBIOS version, which we don't know at this point.
*/ */
dmi_ver = (buf[14] & 0xf0) << 4 | (buf[14] & 0x0f);
if (buf[14] != 0) if (buf[14] != 0)
printk(KERN_INFO "DMI %d.%d present.\n", printk(KERN_INFO "DMI %d.%d present.\n",
buf[14] >> 4, buf[14] & 0xF); buf[14] >> 4, buf[14] & 0xF);