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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>
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1 parent 807be03 commit 9f3b795a626ee79574595e06d1437fe0c7d51d29 Michał Mirosław committed with gregkh Feb 1, 2013
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4 drivers/base/class.c
@@ -420,8 +420,8 @@ EXPORT_SYMBOL_GPL(class_for_each_device);
* code. There's no locking restriction.
*/
struct device *class_find_device(struct class *class, struct device *start,
- void *data,
- int (*match)(struct device *, void *))
+ const void *data,
+ int (*match)(struct device *, const void *))
{
struct class_dev_iter iter;
struct device *dev;
View
4 drivers/base/core.c
@@ -1617,9 +1617,9 @@ struct device *device_create(struct class *class, struct device *parent,
}
EXPORT_SYMBOL_GPL(device_create);
-static int __match_devt(struct device *dev, void *data)
+static int __match_devt(struct device *dev, const void *data)
{
- dev_t *devt = data;
+ const dev_t *devt = data;
return dev->devt == *devt;
}
View
2 drivers/gpio/gpiolib.c
@@ -806,7 +806,7 @@ int gpio_export(unsigned gpio, bool direction_may_change)
}
EXPORT_SYMBOL_GPL(gpio_export);
-static int match_export(struct device *dev, void *data)
+static int match_export(struct device *dev, const void *data)
{
return dev_get_drvdata(dev) == data;
}
View
4 drivers/isdn/mISDN/core.c
@@ -168,13 +168,13 @@ static struct class mISDN_class = {
};
static int
-_get_mdevice(struct device *dev, void *id)
+_get_mdevice(struct device *dev, const void *id)
{
struct mISDNdevice *mdev = dev_to_mISDN(dev);
if (!mdev)
return 0;
- if (mdev->id != *(u_int *)id)
+ if (mdev->id != *(const u_int *)id)
return 0;
return 1;
}
View
2 drivers/net/phy/mdio_bus.c
@@ -95,7 +95,7 @@ static struct class mdio_bus_class = {
#if IS_ENABLED(CONFIG_OF_MDIO)
/* Helper function for of_mdio_find_bus */
-static int of_mdio_bus_match(struct device *dev, void *mdio_bus_np)
+static int of_mdio_bus_match(struct device *dev, const void *mdio_bus_np)
{
return dev->of_node == mdio_bus_np;
}
View
4 drivers/power/power_supply_core.c
@@ -141,15 +141,15 @@ int power_supply_set_battery_charged(struct power_supply *psy)
}
EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
-static int power_supply_match_device_by_name(struct device *dev, void *data)
+static int power_supply_match_device_by_name(struct device *dev, const void *data)
{
const char *name = data;
struct power_supply *psy = dev_get_drvdata(dev);
return strcmp(psy->name, name) == 0;
}
-struct power_supply *power_supply_get_by_name(char *name)
+struct power_supply *power_supply_get_by_name(const char *name)
{
struct device *dev = class_find_device(power_supply_class, NULL, name,
power_supply_match_device_by_name);
View
6 drivers/rtc/interface.c
@@ -587,16 +587,16 @@ void rtc_update_irq(struct rtc_device *rtc,
}
EXPORT_SYMBOL_GPL(rtc_update_irq);
-static int __rtc_match(struct device *dev, void *data)
+static int __rtc_match(struct device *dev, const void *data)
{
- char *name = (char *)data;
+ const char *name = data;
if (strcmp(dev_name(dev), name) == 0)
return 1;
return 0;
}
-struct rtc_device *rtc_class_open(char *name)
+struct rtc_device *rtc_class_open(const char *name)
{
struct device *dev;
struct rtc_device *rtc = NULL;
View
4 drivers/scsi/hosts.c
@@ -468,10 +468,10 @@ void scsi_unregister(struct Scsi_Host *shost)
}
EXPORT_SYMBOL(scsi_unregister);
-static int __scsi_host_match(struct device *dev, void *data)
+static int __scsi_host_match(struct device *dev, const void *data)
{
struct Scsi_Host *p;
- unsigned short *hostnum = (unsigned short *)data;
+ const unsigned short *hostnum = data;
p = class_to_shost(dev);
return p->host_no == *hostnum;
View
26 drivers/scsi/osd/osd_uld.c
@@ -268,26 +268,18 @@ static inline bool _the_same_or_null(const u8 *a1, unsigned a1_len,
return 0 == memcmp(a1, a2, a1_len);
}
-struct find_oud_t {
- const struct osd_dev_info *odi;
- struct device *dev;
- struct osd_uld_device *oud;
-} ;
-
-int _mach_odi(struct device *dev, void *find_data)
+static int _match_odi(struct device *dev, const void *find_data)
{
struct osd_uld_device *oud = container_of(dev, struct osd_uld_device,
class_dev);
- struct find_oud_t *fot = find_data;
- const struct osd_dev_info *odi = fot->odi;
+ const struct osd_dev_info *odi = find_data;
if (_the_same_or_null(oud->odi.systemid, oud->odi.systemid_len,
odi->systemid, odi->systemid_len) &&
_the_same_or_null(oud->odi.osdname, oud->odi.osdname_len,
odi->osdname, odi->osdname_len)) {
OSD_DEBUG("found device sysid_len=%d osdname=%d\n",
odi->systemid_len, odi->osdname_len);
- fot->oud = oud;
return 1;
} else {
return 0;
@@ -301,19 +293,19 @@ int _mach_odi(struct device *dev, void *find_data)
*/
struct osd_dev *osduld_info_lookup(const struct osd_dev_info *odi)
{
- struct find_oud_t find = {.odi = odi};
-
- find.dev = class_find_device(&osd_uld_class, NULL, &find, _mach_odi);
- if (likely(find.dev)) {
+ struct device *dev = class_find_device(&osd_uld_class, NULL, odi, _match_odi);
+ if (likely(dev)) {
struct osd_dev_handle *odh = kzalloc(sizeof(*odh), GFP_KERNEL);
+ struct osd_uld_device *oud = container_of(dev,
+ struct osd_uld_device, class_dev);
if (unlikely(!odh)) {
- put_device(find.dev);
+ put_device(dev);
return ERR_PTR(-ENOMEM);
}
- odh->od = find.oud->od;
- odh->oud = find.oud;
+ odh->od = oud->od;
+ odh->oud = oud;
return &odh->od;
}
View
4 drivers/scsi/scsi_transport_iscsi.c
@@ -183,10 +183,10 @@ static struct attribute_group iscsi_endpoint_group = {
#define ISCSI_MAX_EPID -1
-static int iscsi_match_epid(struct device *dev, void *data)
+static int iscsi_match_epid(struct device *dev, const void *data)
{
struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
- uint64_t *epid = (uint64_t *) data;
+ const uint64_t *epid = data;
return *epid == ep->id;
}
View
4 drivers/spi/spi.c
@@ -1248,10 +1248,10 @@ int spi_master_resume(struct spi_master *master)
}
EXPORT_SYMBOL_GPL(spi_master_resume);
-static int __spi_master_match(struct device *dev, void *data)
+static int __spi_master_match(struct device *dev, const void *data)
{
struct spi_master *m;
- u16 *bus_num = data;
+ const u16 *bus_num = data;
m = container_of(dev, struct spi_master, dev);
return m->bus_num == *bus_num;
View
21 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);
View
4 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;
View
2 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);
View
2 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,
View
4 init/do_mounts.c
@@ -81,9 +81,9 @@ struct uuidcmp {
*
* Returns 1 if the device matches, and 0 otherwise.
*/
-static int match_dev_by_uuid(struct device *dev, void *data)
+static int match_dev_by_uuid(struct device *dev, const void *data)
{
- struct uuidcmp *cmp = data;
+ const struct uuidcmp *cmp = data;
struct hd_struct *part = dev_to_part(dev);
if (!part->info)
View
11 kernel/power/suspend_test.c
@@ -112,7 +112,7 @@ static void __init test_wakealarm(struct rtc_device *rtc, suspend_state_t state)
rtc_set_alarm(rtc, &alm);
}
-static int __init has_wakealarm(struct device *dev, void *name_ptr)
+static int __init has_wakealarm(struct device *dev, const void *data)
{
struct rtc_device *candidate = to_rtc_device(dev);
@@ -121,7 +121,6 @@ static int __init has_wakealarm(struct device *dev, void *name_ptr)
if (!device_may_wakeup(candidate->dev.parent))
return 0;
- *(const char **)name_ptr = dev_name(dev);
return 1;
}
@@ -159,8 +158,8 @@ static int __init test_suspend(void)
static char warn_no_rtc[] __initdata =
KERN_WARNING "PM: no wakealarm-capable RTC driver is ready\n";
- char *pony = NULL;
struct rtc_device *rtc = NULL;
+ struct device *dev;
/* PM is initialized by now; is that state testable? */
if (test_state == PM_SUSPEND_ON)
@@ -171,9 +170,9 @@ static int __init test_suspend(void)
}
/* RTCs have initialized by now too ... can we use one? */
- class_find_device(rtc_class, NULL, &pony, has_wakealarm);
- if (pony)
- rtc = rtc_class_open(pony);
+ dev = class_find_device(rtc_class, NULL, NULL, has_wakealarm);
+ if (dev)
+ rtc = rtc_class_open(dev_name(dev));
if (!rtc) {
printk(warn_no_rtc);
goto done;
View
5 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;
View
4 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;
}

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