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>

1 files changed, 10 insertions, 11 deletions

diff --git a/drivers/uwb/lc-rc.c b/drivers/uwb/lc-rc.c
index 4d688c750801..3eca6ceb9844 100644
--- a/drivers/uwb/lc-rc.c
+++ b/drivers/uwb/lc-rc.c
@@ -40,9 +40,9 @@
 
 #include "uwb-internal.h"
 
-static int uwb_rc_index_match(struct device *dev, void *data)
+static int uwb_rc_index_match(struct device *dev, const void *data)
 {
-        int *index = data;
+        const int *index = data;
         struct uwb_rc *rc = dev_get_drvdata(dev);
 
         if (rc->index == *index)
@@ -334,9 +334,9 @@ void uwb_rc_rm(struct uwb_rc *rc)
 }
 EXPORT_SYMBOL_GPL(uwb_rc_rm);
 
-static int find_rc_try_get(struct device *dev, void *data)
+static int find_rc_try_get(struct device *dev, const void *data)
 {
-        struct uwb_rc *target_rc = data;
+        const struct uwb_rc *target_rc = data;
         struct uwb_rc *rc = dev_get_drvdata(dev);
 
         if (rc == NULL) {
@@ -386,9 +386,9 @@ static inline struct uwb_rc *uwb_rc_get(struct uwb_rc *rc)
         return rc;
 }
 
-static int find_rc_grandpa(struct device *dev, void *data)
+static int find_rc_grandpa(struct device *dev, const void *data)
 {
-        struct device *grandpa_dev = data;
+        const struct device *grandpa_dev = data;
         struct uwb_rc *rc = dev_get_drvdata(dev);
 
         if (rc->uwb_dev.dev.parent->parent == grandpa_dev) {
@@ -419,7 +419,7 @@ struct uwb_rc *uwb_rc_get_by_grandpa(const struct device *grandpa_dev)
         struct device *dev;
         struct uwb_rc *rc = NULL;
 
-        dev = class_find_device(&uwb_rc_class, NULL, (void *)grandpa_dev,
+        dev = class_find_device(&uwb_rc_class, NULL, grandpa_dev,
                                 find_rc_grandpa);
         if (dev)
                 rc = dev_get_drvdata(dev);
@@ -432,9 +432,9 @@ EXPORT_SYMBOL_GPL(uwb_rc_get_by_grandpa);
  *
  * @returns the pointer to the radio controller, properly referenced
  */
-static int find_rc_dev(struct device *dev, void *data)
+static int find_rc_dev(struct device *dev, const void *data)
 {
-        struct uwb_dev_addr *addr = data;
+        const struct uwb_dev_addr *addr = data;
         struct uwb_rc *rc = dev_get_drvdata(dev);
 
         if (rc == NULL) {
@@ -453,8 +453,7 @@ struct uwb_rc *uwb_rc_get_by_dev(const struct uwb_dev_addr *addr)
         struct device *dev;
         struct uwb_rc *rc = NULL;
 
-        dev = class_find_device(&uwb_rc_class, NULL, (void *)addr,
-                                find_rc_dev);
+        dev = class_find_device(&uwb_rc_class, NULL, addr, find_rc_dev);
         if (dev)
                 rc = dev_get_drvdata(dev);