[RFC PATCH 27/57] drivers: Unify the match prototype for bus_find_device with class_find_device

Suzuki K Poulose
2019-06-03T15:53:53Z

We have iterators for devices by bus and class, with a supplied
"match" function to do the comparison. However, both of the helper
function have slightly different prototype for the "match" argument.

int (*) (struct device *dev, void *data) // bus_find_device
vs
int (*) (struct device *dev, const void *data) // class_find_device

Unify the prototype by promoting the match function to use that of
the class_find_device(). This will allow us to share the generic
match helpers with class_find_device() users.

Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Wolfram Sang <wsa@the-dreams.de>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Sebastian Ott <sebott@linux.ibm.com>
Cc: Peter Oberparleiter <oberpar@linux.ibm.com>
Cc: Harald Freudenberger <freude@linux.ibm.com>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Andreas Noever <andreas.noever@gmail.com>
Cc: Michael Jamet <michael.jamet@intel.com>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: David Kershner <david.kershner@unisys.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
arch/powerpc/platforms/pseries/ibmebus.c | 4 ++--
drivers/acpi/acpi_lpss.c | 4 ++--
drivers/acpi/sleep.c | 2 +-
drivers/acpi/utils.c | 4 ++--
drivers/base/bus.c | 2 +-
drivers/base/core.c | 10 +++++-----
drivers/base/platform.c | 2 +-
drivers/char/ipmi/ipmi_si_platform.c | 2 +-
drivers/firmware/efi/dev-path-parser.c | 4 ++--
drivers/hwtracing/coresight/coresight.c | 6 +++---
drivers/i2c/i2c-core-acpi.c | 2 +-
drivers/i2c/i2c-core-of.c | 2 +-
drivers/iio/inkern.c | 2 +-
drivers/net/ethernet/ti/cpsw-phy-sel.c | 4 ++--
drivers/net/ethernet/ti/davinci_emac.c | 2 +-
drivers/net/ethernet/toshiba/tc35815.c | 4 ++--
drivers/pci/probe.c | 2 +-
drivers/pci/search.c | 4 ++--
drivers/s390/cio/css.c | 4 ++--
drivers/s390/cio/device.c | 4 ++--
drivers/s390/crypto/ap_bus.c | 4 ++--
drivers/scsi/scsi_proc.c | 2 +-
drivers/thunderbolt/switch.c | 4 ++--
drivers/usb/core/usb.c | 4 ++--
drivers/usb/phy/phy-am335x-control.c | 4 ++--
drivers/usb/phy/phy-isp1301.c | 4 ++--
drivers/visorbus/visorbus_main.c | 4 ++--
include/linux/device.h | 13 ++++++-------
28 files changed, 54 insertions(+), 55 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/ibmebus.c b/arch/powerpc/platforms/pseries/ibmebus.c
index 84e8ec4..b91eb09 100644
--- a/arch/powerpc/platforms/pseries/ibmebus.c
+++ b/arch/powerpc/platforms/pseries/ibmebus.c
@@ -147,13 +147,13 @@ static const struct dma_map_ops ibmebus_dma_ops = {
.unmap_page = ibmebus_unmap_page,
};

-static int ibmebus_match_path(struct device *dev, void *data)
+static int ibmebus_match_path(struct device *dev, const void *data)
{
struct device_node *dn = to_platform_device(dev)->dev.of_node;
return (of_find_node_by_path(data) == dn);
}

-static int ibmebus_match_node(struct device *dev, void *data)
+static int ibmebus_match_node(struct device *dev, const void *data)
{
return to_platform_device(dev)->dev.of_node == data;
}
diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
index cf76860..dc2ca78 100644
--- a/drivers/acpi/acpi_lpss.c
+++ b/drivers/acpi/acpi_lpss.c
@@ -511,10 +511,10 @@ struct hid_uid {
const char *uid;
};

-static int match_hid_uid(struct device *dev, void *data)
+static int match_hid_uid(struct device *dev, const void *data)
{
struct acpi_device *adev = ACPI_COMPANION(dev);
- struct hid_uid *id = data;
+ const struct hid_uid *id = data;

if (!adev)
return 0;
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index a34decc..fcf4386 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -454,7 +454,7 @@ static int acpi_pm_prepare(void)
return error;
}

-static int find_powerf_dev(struct device *dev, void *data)
+static int find_powerf_dev(struct device *dev, const void *data)
{
struct acpi_device *device = to_acpi_device(dev);
const char *hid = acpi_device_hid(device);
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 1391b63..e3974a8 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -730,10 +730,10 @@ struct acpi_dev_match_info {
s64 hrv;
};

-static int acpi_dev_match_cb(struct device *dev, void *data)
+static int acpi_dev_match_cb(struct device *dev, const void *data)
{
struct acpi_device *adev = to_acpi_device(dev);
- struct acpi_dev_match_info *match = data;
+ const struct acpi_dev_match_info *match = data;
unsigned long long hrv;
acpi_status status;

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 229e83ee..abe32b6 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -324,7 +324,7 @@ EXPORT_SYMBOL_GPL(bus_for_each_dev);
*/
struct device *bus_find_device(struct bus_type *bus,
struct device *start, void *data,
- int (*match)(struct device *dev, void *data))
+ int (*match)(struct device *dev, const void *data))
{
struct klist_iter i;
struct device *dev;
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 88fa037..731baac 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -3329,31 +3329,31 @@ void device_set_of_node_from_dev(struct device *dev, const struct device *dev2)
}
EXPORT_SYMBOL_GPL(device_set_of_node_from_dev);

-int device_match_of_node(struct device *dev, void *np)
+int device_match_of_node(struct device *dev, const void *np)
{
return dev->of_node == np;
}
EXPORT_SYMBOL_GPL(device_match_of_node);

-int device_match_acpi_dev(struct device *dev, void *adev)
+int device_match_acpi_dev(struct device *dev, const void *adev)
{
return ACPI_COMPANION(dev) == adev;
}
EXPORT_SYMBOL(device_match_acpi_dev);

-int device_match_fwnode(struct device *dev, void *fwnode)
+int device_match_fwnode(struct device *dev, const void *fwnode)
{
return dev_fwnode(dev) == fwnode;
}
EXPORT_SYMBOL_GPL(device_match_fwnode);

-int device_match_devt(struct device *dev, void *pdevt)
+int device_match_devt(struct device *dev, const void *pdevt)
{
return dev->devt == *(dev_t *)pdevt;
}
EXPORT_SYMBOL_GPL(device_match_devt);

-int device_match_name(struct device *dev, void *name)
+int device_match_name(struct device *dev, const void *name)
{
return sysfs_streq(dev_name(dev), name);
}
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index daca44f..55ce86f 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -1207,7 +1207,7 @@ struct device *platform_find_device_by_driver(struct device *start,
const struct device_driver *drv)
{
return bus_find_device(&platform_bus_type, start, (void *)drv,
- (int (*)(struct device *, void *))platform_match);
+ (int (*)(struct device *, const void *))platform_match);
}
EXPORT_SYMBOL_GPL(platform_find_device_by_driver);

diff --git a/drivers/char/ipmi/ipmi_si_platform.c b/drivers/char/ipmi/ipmi_si_platform.c
index ff82353..99233f3 100644
--- a/drivers/char/ipmi/ipmi_si_platform.c
+++ b/drivers/char/ipmi/ipmi_si_platform.c
@@ -426,7 +426,7 @@ static int ipmi_remove(struct platform_device *pdev)
return ipmi_si_remove_by_dev(&pdev->dev);
}

-static int pdev_match_name(struct device *dev, void *data)
+static int pdev_match_name(struct device *dev, const void *data)
{
struct platform_device *pdev = to_platform_device(dev);
const char *name = data;
diff --git a/drivers/firmware/efi/dev-path-parser.c b/drivers/firmware/efi/dev-path-parser.c
index 85ec99f..2012338 100644
--- a/drivers/firmware/efi/dev-path-parser.c
+++ b/drivers/firmware/efi/dev-path-parser.c
@@ -17,9 +17,9 @@ struct acpi_hid_uid {
char uid[11]; /* UINT_MAX + null byte */
};

-static int __init match_acpi_dev(struct device *dev, void *data)
+static int __init match_acpi_dev(struct device *dev, const void *data)
{
- struct acpi_hid_uid hid_uid = *(struct acpi_hid_uid *)data;
+ struct acpi_hid_uid hid_uid = *(const struct acpi_hid_uid *)data;
struct acpi_device *adev = to_acpi_device(dev);

if (acpi_match_device_ids(adev, hid_uid.hid))
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 37ccd67..8231a0e 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -498,9 +498,9 @@ struct coresight_device *coresight_get_sink(struct list_head *path)
return csdev;
}

-static int coresight_enabled_sink(struct device *dev, void *data)
+static int coresight_enabled_sink(struct device *dev, const void *data)
{
- bool *reset = data;
+ const bool *reset = data;
struct coresight_device *csdev = to_coresight_device(dev);

if ((csdev->type == CORESIGHT_DEV_TYPE_SINK ||
@@ -544,7 +544,7 @@ struct coresight_device *coresight_get_enabled_sink(bool deactivate)
return dev ? to_coresight_device(dev) : NULL;
}

-static int coresight_sink_by_id(struct device *dev, void *data)
+static int coresight_sink_by_id(struct device *dev, const void *data)
{
struct coresight_device *csdev = to_coresight_device(dev);
unsigned long hash;
diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index e28165b..cd6ff7a 100644
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -318,7 +318,7 @@ u32 i2c_acpi_find_bus_speed(struct device *dev)
}
EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed);

-static int i2c_acpi_find_match_adapter(struct device *dev, void *data)
+static int i2c_acpi_find_match_adapter(struct device *dev, const void *data)
{
struct i2c_adapter *adapter = i2c_verify_adapter(dev);

diff --git a/drivers/i2c/i2c-core-of.c b/drivers/i2c/i2c-core-of.c
index b0b3fe1..e7f84d8 100644
--- a/drivers/i2c/i2c-core-of.c
+++ b/drivers/i2c/i2c-core-of.c
@@ -112,7 +112,7 @@ void of_i2c_register_devices(struct i2c_adapter *adap)
of_node_put(bus);
}

-static int of_dev_or_parent_node_match(struct device *dev, void *data)
+static int of_dev_or_parent_node_match(struct device *dev, const void *data)
{
if (dev->of_node == data)
return 1;
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index 4a5eff3..c46fb59 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -93,7 +93,7 @@ static const struct iio_chan_spec

#ifdef CONFIG_OF

-static int iio_dev_node_match(struct device *dev, void *data)
+static int iio_dev_node_match(struct device *dev, const void *data)
{
return dev->of_node == data && dev->type == &iio_device_type;
}
diff --git a/drivers/net/ethernet/ti/cpsw-phy-sel.c b/drivers/net/ethernet/ti/cpsw-phy-sel.c
index 48e0924..4e184ee 100644
--- a/drivers/net/ethernet/ti/cpsw-phy-sel.c
+++ b/drivers/net/ethernet/ti/cpsw-phy-sel.c
@@ -151,9 +151,9 @@ static void cpsw_gmii_sel_dra7xx(struct cpsw_phy_sel_priv *priv,
}

static struct platform_driver cpsw_phy_sel_driver;
-static int match(struct device *dev, void *data)
+static int match(struct device *dev, const void *data)
{
- struct device_node *node = (struct device_node *)data;
+ const struct device_node *node = (const struct device_node *)data;
return dev->of_node == node &&
dev->driver == &cpsw_phy_sel_driver.driver;
}
diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c
index 4bf65ca..57d131a 100644
--- a/drivers/net/ethernet/ti/davinci_emac.c
+++ b/drivers/net/ethernet/ti/davinci_emac.c
@@ -1371,7 +1371,7 @@ static int emac_devioctl(struct net_device *ndev, struct ifreq *ifrq, int cmd)
return -EOPNOTSUPP;
}

-static int match_first_device(struct device *dev, void *data)
+static int match_first_device(struct device *dev, const void *data)
{
if (dev->parent && dev->parent->of_node)
return of_device_is_compatible(dev->parent->of_node,
diff --git a/drivers/net/ethernet/toshiba/tc35815.c b/drivers/net/ethernet/toshiba/tc35815.c
index c50a977..8479a44 100644
--- a/drivers/net/ethernet/toshiba/tc35815.c
+++ b/drivers/net/ethernet/toshiba/tc35815.c
@@ -694,10 +694,10 @@ static int tc_mii_init(struct net_device *dev)
* should provide a "tc35815-mac" device with a MAC address in its
* platform_data.
*/
-static int tc35815_mac_match(struct device *dev, void *data)
+static int tc35815_mac_match(struct device *dev, const void *data)
{
struct platform_device *plat_dev = to_platform_device(dev);
- struct pci_dev *pci_dev = data;
+ const struct pci_dev *pci_dev = data;
unsigned int id = pci_dev->irq;
return !strcmp(plat_dev->name, "tc35815-mac") && plat_dev->id == id;
}
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 0e8e2c1..f9ef7ad 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -64,7 +64,7 @@ static struct resource *get_pci_domain_busn_res(int domain_nr)
return &r->res;
}

-static int find_anything(struct device *dev, void *data)
+static int find_anything(struct device *dev, const void *data)
{
return 1;
}
diff --git a/drivers/pci/search.c b/drivers/pci/search.c
index 5c79226..7f4e658 100644
--- a/drivers/pci/search.c
+++ b/drivers/pci/search.c
@@ -236,10 +236,10 @@ struct pci_dev *pci_get_domain_bus_and_slot(int domain, unsigned int bus,
}
EXPORT_SYMBOL(pci_get_domain_bus_and_slot);

-static int match_pci_dev_by_id(struct device *dev, void *data)
+static int match_pci_dev_by_id(struct device *dev, const void *data)
{
struct pci_dev *pdev = to_pci_dev(dev);
- struct pci_device_id *id = data;
+ const struct pci_device_id *id = data;

if (pci_match_one_device(id, pdev))
return 1;
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index aea5029..7b8488d 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -434,10 +434,10 @@ static int css_probe_device(struct subchannel_id schid, struct schib *schib)
}

static int
-check_subchannel(struct device * dev, void * data)
+check_subchannel(struct device *dev, const void *data)
{
struct subchannel *sch;
- struct subchannel_id *schid = data;
+ const struct subchannel_id *schid = data;

sch = to_subchannel(dev);
return schid_equal(&sch->schid, schid);
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 1540229..6ca9a3a 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -642,10 +642,10 @@ static int ccw_device_add(struct ccw_device *cdev)
return device_add(dev);
}

-static int match_dev_id(struct device *dev, void *data)
+static int match_dev_id(struct device *dev, const void *data)
{
struct ccw_device *cdev = to_ccwdev(dev);
- struct ccw_dev_id *dev_id = data;
+ const struct ccw_dev_id *dev_id = data;

return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
}
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index b9fc502..e440682 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -1365,7 +1365,7 @@ static int __match_card_device_with_id(struct device *dev, void *data)
* Helper function to be used with bus_find_dev
* matches for the queue device with a given qid
*/
-static int __match_queue_device_with_qid(struct device *dev, void *data)
+static int __match_queue_device_with_qid(struct device *dev, const void *data)
{
return is_queue_dev(dev) && to_ap_queue(dev)->qid == (int)(long) data;
}
@@ -1374,7 +1374,7 @@ static int __match_queue_device_with_qid(struct device *dev, void *data)
* Helper function to be used with bus_find_dev
* matches any queue device with given queue id
*/
-static int __match_queue_device_with_queue_id(struct device *dev, void *data)
+static int __match_queue_device_with_queue_id(struct device *dev, const void *data)
{
return is_queue_dev(dev)
&& AP_QID_QUEUE(to_ap_queue(dev)->qid) == (int)(long) data;
diff --git a/drivers/scsi/scsi_proc.c b/drivers/scsi/scsi_proc.c
index 7f0ceb6..c074631 100644
--- a/drivers/scsi/scsi_proc.c
+++ b/drivers/scsi/scsi_proc.c
@@ -372,7 +372,7 @@ static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
return err;
}

-static int always_match(struct device *dev, void *data)
+static int always_match(struct device *dev, const void *data)
{
return 1;
}
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index c1b0165..c9a7e4a 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -1946,10 +1946,10 @@ struct tb_sw_lookup {
u64 route;
};

-static int tb_switch_match(struct device *dev, void *data)
+static int tb_switch_match(struct device *dev, const void *data)
{
struct tb_switch *sw = tb_to_switch(dev);
- struct tb_sw_lookup *lookup = data;
+ const struct tb_sw_lookup *lookup = data;

if (!sw)
return 0;
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 7fcb9f7..1678e30 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -325,9 +325,9 @@ struct find_interface_arg {
struct device_driver *drv;
};

-static int __find_interface(struct device *dev, void *data)
+static int __find_interface(struct device *dev, const void *data)
{
- struct find_interface_arg *arg = data;
+ const struct find_interface_arg *arg = data;
struct usb_interface *intf;

if (!is_usb_interface(dev))
diff --git a/drivers/usb/phy/phy-am335x-control.c b/drivers/usb/phy/phy-am335x-control.c
index a3cb25c..d16dfc3 100644
--- a/drivers/usb/phy/phy-am335x-control.c
+++ b/drivers/usb/phy/phy-am335x-control.c
@@ -118,9 +118,9 @@ static const struct of_device_id omap_control_usb_id_table[] = {
MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);

static struct platform_driver am335x_control_driver;
-static int match(struct device *dev, void *data)
+static int match(struct device *dev, const void *data)
{
- struct device_node *node = (struct device_node *)data;
+ const struct device_node *node = (const struct device_node *)data;
return dev->of_node == node &&
dev->driver == &am335x_control_driver.driver;
}
diff --git a/drivers/usb/phy/phy-isp1301.c b/drivers/usb/phy/phy-isp1301.c
index 93b7d6a..6cf6fbd 100644
--- a/drivers/usb/phy/phy-isp1301.c
+++ b/drivers/usb/phy/phy-isp1301.c
@@ -142,9 +142,9 @@ static struct i2c_driver isp1301_driver = {

module_i2c_driver(isp1301_driver);

-static int match(struct device *dev, void *data)
+static int match(struct device *dev, const void *data)
{
- struct device_node *node = (struct device_node *)data;
+ const struct device_node *node = (const struct device_node *)data;
return (dev->of_node == node) &&
(dev->driver == &isp1301_driver.driver);
}
diff --git a/drivers/visorbus/visorbus_main.c b/drivers/visorbus/visorbus_main.c
index 0b2434c..152fd29 100644
--- a/drivers/visorbus/visorbus_main.c
+++ b/drivers/visorbus/visorbus_main.c
@@ -171,10 +171,10 @@ struct visor_busdev {
u32 dev_no;
};

-static int match_visorbus_dev_by_id(struct device *dev, void *data)
+static int match_visorbus_dev_by_id(struct device *dev, const void *data)
{
struct visor_device *vdev = to_visor_device(dev);
- struct visor_busdev *id = data;
+ const struct visor_busdev *id = data;

if (vdev->chipset_bus_no == id->bus_no &&
vdev->chipset_dev_no == id->dev_no)
diff --git a/include/linux/device.h b/include/linux/device.h
index b4a9cd2..e8d1267 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -163,18 +163,17 @@ void subsys_dev_iter_init(struct subsys_dev_iter *iter,
struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
void subsys_dev_iter_exit(struct subsys_dev_iter *iter);

-int device_match_of_node(struct device *dev, void *np);
-int device_match_acpi_dev(struct device *dev, void *adev);
-int device_match_fwnode(struct device *dev, void *fwnode);
-int device_match_devt(struct device *dev, void *pdevt);
-int device_match_name(struct device *dev, void *name);
+int device_match_of_node(struct device *dev, const void *np);
+int device_match_acpi_dev(struct device *dev, const void *adev);
+int device_match_fwnode(struct device *dev, const void *fwnode);
+int device_match_devt(struct device *dev, const void *pdevt);
+int device_match_name(struct device *dev, const void *name);

int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
int (*fn)(struct device *dev, void *data));
struct device *bus_find_device(struct bus_type *bus, struct device *start,
void *data,
- int (*match)(struct device *dev, void *data));
-
+ int (*match)(struct device *dev, const void *data));
/**
* bus_find_device_by_name - device iterator for locating a particular device
* of a specific name.
--
2.7.4