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Driver core: add bus_find_device_by_name function

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The driver core, and some other parts of the kernel just want to find a
device based on a name for a specific bus.  Give them a simple wrapper
to prevent them from having to always roll their own.

This will be used in the PPC patch later in this series.

Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman 2008-01-27 10:29:20 -08:00
parent 123ca9575b
commit 1f9ffc049d
2 changed files with 32 additions and 12 deletions
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41
drivers/base/bus.c
View file

@ -163,15 +163,6 @@ static struct kset *bus_kset;
#ifdef CONFIG_HOTPLUG
/* Manually detach a device from its associated driver. */
static int driver_helper(struct device *dev, void *data)
{
const char *name = data;
if (strcmp(name, dev->bus_id) == 0)
return 1;
return 0;
}
static ssize_t driver_unbind(struct device_driver *drv,
const char *buf, size_t count)
{
@ -179,7 +170,7 @@ static ssize_t driver_unbind(struct device_driver *drv,
struct device *dev;
int err = -ENODEV;
dev = bus_find_device(bus, NULL, (void *)buf, driver_helper);
dev = bus_find_device_by_name(bus, NULL, buf);
if (dev && dev->driver == drv) {
if (dev->parent) /* Needed for USB */
down(&dev->parent->sem);
@ -206,7 +197,7 @@ static ssize_t driver_bind(struct device_driver *drv,
struct device *dev;
int err = -ENODEV;
dev = bus_find_device(bus, NULL, (void *)buf, driver_helper);
dev = bus_find_device_by_name(bus, NULL, buf);
if (dev && dev->driver == NULL) {
if (dev->parent) /* Needed for USB */
down(&dev->parent->sem);
@ -250,7 +241,7 @@ static ssize_t store_drivers_probe(struct bus_type *bus,
{
struct device *dev;
dev = bus_find_device(bus, NULL, (void *)buf, driver_helper);
dev = bus_find_device_by_name(bus, NULL, buf);
if (!dev)
return -ENODEV;
if (bus_rescan_devices_helper(dev, NULL) != 0)
@ -338,6 +329,32 @@ struct device *bus_find_device(struct bus_type *bus,
}
EXPORT_SYMBOL_GPL(bus_find_device);
static int match_name(struct device *dev, void *data)
{
const char *name = data;
if (strcmp(name, dev->bus_id) == 0)
return 1;
return 0;
}
/**
* bus_find_device_by_name - device iterator for locating a particular device of a specific name
* @bus: bus type
* @start: Device to begin with
* @name: name of the device to match
*
* This is similar to the bus_find_device() function above, but it handles
* searching by a name automatically, no need to write another strcmp matching
* function.
*/
struct device *bus_find_device_by_name(struct bus_type *bus,
struct device *start, const char *name)
{
return bus_find_device(bus, start, (void *)name, match_name);
}
EXPORT_SYMBOL_GPL(bus_find_device_by_name);
static struct device_driver *next_driver(struct klist_iter *i)
{
struct klist_node *n = klist_next(i);

3
include/linux/device.h
View file

@ -84,6 +84,9 @@ int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
struct device *bus_find_device(struct bus_type *bus, struct device *start,
void *data,
int (*match)(struct device *dev, void *data));
struct device *bus_find_device_by_name(struct bus_type *bus,
struct device *start,
const char *name);
int __must_check bus_for_each_drv(struct bus_type *bus,
struct device_driver *start, void *data,