driver-core: constify data for class_find_device()

All in-kernel users of class_find_device() don't really need mutable
data for match callback.

In two places (kernel/power/suspend_test.c, drivers/scsi/osd/osd_uld.c)
this patch changes match callbacks to use const search data.

The const is propagated to rtc_class_open() and power_supply_get_by_name()
parameters.

Note that there's a dev reference leak in suspend_test.c that's not
touched in this patch.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 4 insertions, 4 deletions

diff --git a/include/linux/device.h b/include/linux/device.h
index 251f33b21ef9..a089676084a5 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -395,8 +395,8 @@ extern int class_for_each_device(struct class *class, struct device *start,
                                  void *data,
                                  int (*fn)(struct device *dev, void *data));
 extern struct device *class_find_device(struct class *class,
-                                        struct device *start, void *data,
-                                        int (*match)(struct device *, void *));
+                                        struct device *start, const void *data,
+                                        int (*match)(struct device *, const void *));
 
 struct class_attribute {
         struct attribute attr;
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 1f0ab90aff00..86ecaa679ded 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -224,7 +224,7 @@ struct power_supply_info {
         int use_for_apm;
 };
 
-extern struct power_supply *power_supply_get_by_name(char *name);
+extern struct power_supply *power_supply_get_by_name(const char *name);
 extern void power_supply_changed(struct power_supply *psy);
 extern int power_supply_am_i_supplied(struct power_supply *psy);
 extern int power_supply_set_battery_charged(struct power_supply *psy);
diff --git a/include/linux/rtc.h b/include/linux/rtc.h
index 9531845c419f..445fe6e7c629 100644
--- a/include/linux/rtc.h
+++ b/include/linux/rtc.h
@@ -148,7 +148,7 @@ extern int rtc_initialize_alarm(struct rtc_device *rtc,
 extern void rtc_update_irq(struct rtc_device *rtc,
                         unsigned long num, unsigned long events);
 
-extern struct rtc_device *rtc_class_open(char *name);
+extern struct rtc_device *rtc_class_open(const char *name);
 extern void rtc_class_close(struct rtc_device *rtc);
 
 extern int rtc_irq_register(struct rtc_device *rtc,