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author | 2006-11-16 15:42:07 +0100 | |
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committer | 2006-12-01 14:52:01 -0800 | |
commit | 5ab699810d46011ad2195c5916f3cbc684bfe3ee (patch) | |
tree | 991f6d4f502fd7871766b51a94a0e3ab33aadd62 /drivers/base | |
parent | sysfs: sysfs_write_file() writes zero terminated data (diff) | |
download | linux-5ab699810d46011ad2195c5916f3cbc684bfe3ee.tar.gz linux-5ab699810d46011ad2195c5916f3cbc684bfe3ee.tar.bz2 linux-5ab699810d46011ad2195c5916f3cbc684bfe3ee.zip |
driver core: Introduce device_find_child().
Introduce device_find_child() to match device_for_each_child().
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base')
-rw-r--r-- | drivers/base/core.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c index 5d11bbdfbd2f..a29e68545462 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -750,12 +750,45 @@ int device_for_each_child(struct device * parent, void * data, return error; } +/** + * device_find_child - device iterator for locating a particular device. + * @parent: parent struct device + * @data: Data to pass to match function + * @match: Callback function to check device + * + * This is similar to the device_for_each_child() 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 and a reference to the + * current device can be obtained, this function will return to the caller + * and not iterate over any more devices. + */ +struct device * device_find_child(struct device *parent, void *data, + int (*match)(struct device *, void *)) +{ + struct klist_iter i; + struct device *child; + + if (!parent) + return NULL; + + klist_iter_init(&parent->klist_children, &i); + while ((child = next_device(&i))) + if (match(child, data) && get_device(child)) + break; + klist_iter_exit(&i); + return child; +} + int __init devices_init(void) { return subsystem_register(&devices_subsys); } EXPORT_SYMBOL_GPL(device_for_each_child); +EXPORT_SYMBOL_GPL(device_find_child); EXPORT_SYMBOL_GPL(device_initialize); EXPORT_SYMBOL_GPL(device_add); |