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>

2 files changed, 4 insertions, 5 deletions

diff --git a/net/ieee802154/wpan-class.c b/net/ieee802154/wpan-class.c
index 1627ef2e8522..13571eae6bae 100644
--- a/net/ieee802154/wpan-class.c
+++ b/net/ieee802154/wpan-class.c
@@ -91,7 +91,7 @@ static struct class wpan_phy_class = {
 static DEFINE_MUTEX(wpan_phy_mutex);
 static int wpan_phy_idx;
 
-static int wpan_phy_match(struct device *dev, void *data)
+static int wpan_phy_match(struct device *dev, const void *data)
 {
         return !strcmp(dev_name(dev), (const char *)data);
 }
@@ -103,8 +103,7 @@ struct wpan_phy *wpan_phy_find(const char *str)
         if (WARN_ON(!str))
                 return NULL;
 
-        dev = class_find_device(&wpan_phy_class, NULL,
-                        (void *)str, wpan_phy_match);
+        dev = class_find_device(&wpan_phy_class, NULL, str, wpan_phy_match);
         if (!dev)
                 return NULL;
 
diff --git a/net/nfc/core.c b/net/nfc/core.c
index aa64ea441676..0f4a6de6f161 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -734,10 +734,10 @@ struct class nfc_class = {
 };
 EXPORT_SYMBOL(nfc_class);
 
-static int match_idx(struct device *d, void *data)
+static int match_idx(struct device *d, const void *data)
 {
         struct nfc_dev *dev = to_nfc_dev(d);
-        unsigned int *idx = data;
+        const unsigned int *idx = data;
 
         return dev->idx == *idx;
 }