linux-kernel - Re: [PATCH] DMI: Always call dmi

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Date:	Thu, 21 Feb 2013 10:58:37 +0800
From:	Zhenzhong Duan <zhenzhong.duan@...cle.com>
To:	"H.J. Lu" <hjl.tools@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] DMI: Always call dmi_present with DMI structure

Hi
Ben had sent a patch fixing this issue. Would you like to test his patch?
https://lkml.org/lkml/2013/2/16/102
zduan
On 2013-02-21 02:12, H.J. Lu wrote:
> Hi,
>
> This patch:
>
> commit 9f9c9cbb60576a1518d0bf93fb8e499cffccf377
> Author: Zhenzhong Duan <zhenzhong.duan@...cle.com>
> Date:   Thu Dec 20 15:05:14 2012 -0800
>
>      drivers/firmware/dmi_scan.c: fetch dmi version from SMBIOS if it exists
>
>      The right dmi version is in SMBIOS if it's zero in DMI region
>
>      This issue was originally found from an oracle bug.
>      One customer noticed system UUID doesn't match between dmidecode & uek2.
>
>       - HP ProLiant BL460c G6 :
>         # cat /sys/devices/virtual/dmi/id/product_uuid
>         00000000-0000-4C48-3031-4D5030333531
>         # dmidecode | grep -i uuid    drivers/firmware/dmi_scan.c:
> fetch dmi version from SMBIOS if it exists
>
>      The right dmi version is in SMBIOS if it's zero in DMI region
>
>      This issue was originally found from an oracle bug.
>      One customer noticed system UUID doesn't match between dmidecode & uek2.
>
>       - HP ProLiant BL460c G6 :
>         # cat /sys/devices/virtual/dmi/id/product_uuid
>         00000000-0000-4C48-3031-4D5030333531
>         # dmidecode | grep -i uuid
>         UUID: 00000000-0000-484C-3031-4D5030333531
>
>      From SMBIOS 2.6 on, spec use little-endian encoding for UUID other than
>      network byte order.
>
>      So we need to get dmi version to distinguish.  If version is 0.0, the
>      real version is taken from the SMBIOS version.  This is part of original
>      kernel comment in code.
>
>         UUID: 00000000-0000-484C-3031-4D5030333531
>
>      From SMBIOS 2.6 on, spec use little-endian encoding for UUID other than
>      network byte order.
>
>      So we need to get dmi version to distinguish.  If version is 0.0, the
>      real version is taken from the SMBIOS version.  This is part of original
>      kernel comment in code.
>
> causes a regression in 3.7, 3.8 and 3.9 kernels.   Before the change,
> we only scan DMI structure.  Now smbios_present scans SMBIOS
> entry point.  I have a machine which has invalid checksum in
> SMBIOS entry point.  We wind up calling dmi_present with SMBIOS
> entry point instead of DMI structure.  This patch changes smbios_present
> to always call dmi_present with DMI structure.
>
>

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