| From | Herton Ronaldo Krzesinski <> | Subject | [PATCH 74/93] drivers/firmware/dmi_scan.c: check dmi version when get system uuid | Date | Tue, 5 Feb 2013 20:07:03 -0200 |
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3.5.7.5 -stable review patch. If anyone has any objections, please let me know.
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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: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com> --- 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 2d1539f..b1c2596 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); -- 1.7.9.5
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