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, 5 insertions, 5 deletions

diff --git a/drivers/input/misc/wistron_btns.c b/drivers/input/misc/wistron_btns.c
index 60121f10f8d9..b438d998625c 100644
--- a/drivers/input/misc/wistron_btns.c
+++ b/drivers/input/misc/wistron_btns.c
@@ -247,7 +247,7 @@ static int have_wifi;
 static int have_bluetooth;
 static int have_leds;
 
-static int __init dmi_matched(struct dmi_system_id *dmi)
+static int __init dmi_matched(const struct dmi_system_id *dmi)
 {
         const struct key_entry *key;
 
diff --git a/drivers/input/mouse/lifebook.c b/drivers/input/mouse/lifebook.c
index 91109b49fde1..608674d0be8b 100644
--- a/drivers/input/mouse/lifebook.c
+++ b/drivers/input/mouse/lifebook.c
@@ -27,7 +27,7 @@ struct lifebook_data {
 
 static const char *desired_serio_phys;
 
-static int lifebook_set_serio_phys(struct dmi_system_id *d)
+static int lifebook_set_serio_phys(const struct dmi_system_id *d)
 {
         desired_serio_phys = d->driver_data;
         return 0;
@@ -35,13 +35,13 @@ static int lifebook_set_serio_phys(struct dmi_system_id *d)
 
 static unsigned char lifebook_use_6byte_proto;
 
-static int lifebook_set_6byte_proto(struct dmi_system_id *d)
+static int lifebook_set_6byte_proto(const struct dmi_system_id *d)
 {
         lifebook_use_6byte_proto = 1;
         return 0;
 }
 
-static struct dmi_system_id lifebook_dmi_table[] = {
+static const struct dmi_system_id lifebook_dmi_table[] = {
         {
                 .ident = "FLORA-ie 55mi",
                 .matches = {
diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index 666ad3a53fdb..d349c4a5e3e8 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -602,7 +602,7 @@ static int synaptics_reconnect(struct psmouse *psmouse)
 
 #if defined(__i386__)
 #include <linux/dmi.h>
-static struct dmi_system_id toshiba_dmi_table[] = {
+static const struct dmi_system_id toshiba_dmi_table[] = {
         {
                 .ident = "Toshiba Satellite",
                 .matches = {