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author | Cornelia Huck <cohuck@de.ibm.com> | 2005-06-22 14:59:51 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2005-06-30 05:48:03 (GMT) |
commit | 0edb586049e57c56e625536476931117a57671e9 (patch) | |
tree | 9d92bb9821d134d199d62de1ff3096ff2b73fdc7 /drivers/base/bus.c | |
parent | fd782a4a99d2d3e818b9465c427b10f7f027d7da (diff) | |
download | linux-0edb586049e57c56e625536476931117a57671e9.tar.xz |
[PATCH] driver core: add bus_find_device & driver_find_device functions
Add bus_find_device() and driver_find_device() which allow searching for a
device in the bus's resp. the driver's klist and obtain a reference on it.
Signed-off-by: Cornelia Huck <cohuck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base/bus.c')
-rw-r--r-- | drivers/base/bus.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/base/bus.c b/drivers/base/bus.c index c3fac7f..2c64b79 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -177,6 +177,39 @@ int bus_for_each_dev(struct bus_type * bus, struct device * start, return error; } +/** + * bus_find_device - device iterator for locating a particular device. + * @bus: bus type + * @start: Device to begin with + * @data: Data to pass to match function + * @match: Callback function to check device + * + * This is similar to the bus_for_each_dev() function above, but it + * returns a reference to a device that is 'found' for later use, as + * determined by the @match callback. + * + * The callback should return 0 if the device doesn't match and non-zero + * if it does. If the callback returns non-zero, this function will + * return to the caller and not iterate over any more devices. + */ +struct device * bus_find_device(struct bus_type *bus, + struct device *start, void *data, + int (*match)(struct device *, void *)) +{ + struct klist_iter i; + struct device *dev; + + if (!bus) + return NULL; + + klist_iter_init_node(&bus->klist_devices, &i, + (start ? &start->knode_bus : NULL)); + while ((dev = next_device(&i))) + if (match(dev, data) && get_device(dev)) + break; + klist_iter_exit(&i); + return dev; +} static struct device_driver * next_driver(struct klist_iter * i) @@ -557,6 +590,7 @@ int __init buses_init(void) EXPORT_SYMBOL_GPL(bus_for_each_dev); +EXPORT_SYMBOL_GPL(bus_find_device); EXPORT_SYMBOL_GPL(bus_for_each_drv); EXPORT_SYMBOL_GPL(bus_add_device); |