[PATCH] support to overwrite DMI board info

[Alan Cox <alan@linux.intel.com>]

From: Jiang, Chao <chao.jiang@intel.com>

support to overwrite board vendor/version/name information by editing
/boot/cmdline file. Format example:
	board_vendor="XXX company" board_version=DV3.0


Signed-off-by: Jiang, Chao <chao.jiang@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
---

 drivers/firmware/dmi_scan.c |   37 +++++++++++++++++++++++++++++++++++++
 1 files changed, 37 insertions(+), 0 deletions(-)


diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index b3d22d6..5763618 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -712,3 +712,40 @@ bool dmi_match(enum dmi_field f, const char *str)
 	return !strcmp(info, str);
 }
 EXPORT_SYMBOL_GPL(dmi_match);
+
+static int __init dmi_override(int slot, char *str)
+{
+	size_t len;
+	char *p;
+	if (!str)
+		return -EINVAL;
+	len = strlen(str) + 1;
+	p = dmi_alloc(len);
+	if (p != NULL)
+		strcpy(p, str);
+	else {
+		printk(KERN_ERR "dm_override: cannot allocate %Zu bytes.\n",
+					len);
+		return -ENOMEM;
+	}
+	dmi_ident[slot] = p;
+	return 0;
+}
+
+static int __init override_dmi_board_vendor(char *str)
+{
+	return dmi_override(DMI_BOARD_VENDOR, str);
+}
+early_param("board_vendor", override_dmi_board_vendor);
+
+static int __init override_dmi_board_version(char *str)
+{
+	return dmi_override(DMI_BOARD_VERSION, str);
+}
+early_param("board_version", override_dmi_board_version);
+
+static int __init override_dmi_board_name(char *str)
+{
+	return dmi_override(DMI_BOARD_NAME, str);
+}
+early_param("board_name", override_dmi_board_name);