drivers/firmware: const-ify DMI API and internals

Three main sets of changes:

1) dmi_get_system_info() return value should have been marked const,
   since callers should not be changing that data.

2) const-ify DMI internals, since DMI firmware tables should,
   whenever possible, be marked const to ensure we never ever write to
   that data area.

3) const-ify DMI API, to enable marking tables const where possible
   in low-level drivers.

And if we're really lucky, this might enable some additional
optimizations on the part of the compiler.

The bulk of the changes are #2 and #3, which are interrelated.  #1 could
have been a separate patch, but it was so small compared to the others,
it was easier to roll it into this changeset.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

3 files changed, 4 insertions, 4 deletions

diff --git a/drivers/misc/msi-laptop.c b/drivers/misc/msi-laptop.c
index 349be934db7c..83679c762925 100644
--- a/drivers/misc/msi-laptop.c
+++ b/drivers/misc/msi-laptop.c
@@ -283,7 +283,7 @@ static struct platform_device *msipf_device;
 
 /* Initialization */
 
-static int dmi_check_cb(struct dmi_system_id *id)
+static int dmi_check_cb(const struct dmi_system_id *id)
 {
         printk("msi-laptop: Identified laptop model '%s'.\n", id->ident);
         return 0;
diff --git a/drivers/misc/sony-laptop.c b/drivers/misc/sony-laptop.c
index d38ddce592c0..e73a71f04bb4 100644
--- a/drivers/misc/sony-laptop.c
+++ b/drivers/misc/sony-laptop.c
@@ -807,7 +807,7 @@ static struct sony_nc_event *sony_nc_events;
 /* Vaio C* --maybe also FE*, N* and AR* ?-- special init sequence
  * for Fn keys
  */
-static int sony_nc_C_enable(struct dmi_system_id *id)
+static int sony_nc_C_enable(const struct dmi_system_id *id)
 {
         int result = 0;
 
@@ -845,7 +845,7 @@ static struct sony_nc_event sony_C_events[] = {
 };
 
 /* SNC-only model map */
-static struct dmi_system_id sony_nc_ids[] = {
+static const struct dmi_system_id sony_nc_ids[] = {
                 {
                         .ident = "Sony Vaio FE Series",
                         .callback = sony_nc_C_enable,
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 0222bbaf7b76..6c0b2f0a51ab 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -4448,7 +4448,7 @@ static void ibm_exit(struct ibm_struct *ibm)
 
 static void __init get_thinkpad_model_data(struct thinkpad_id_data *tp)
 {
-        struct dmi_device *dev = NULL;
+        const struct dmi_device *dev = NULL;
         char ec_fw_string[18];
 
         if (!tp)