From 5a3ceb861663040f9ef0176df4aaa494bba5e352 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Mon, 25 Aug 2008 19:50:19 +0200 Subject: driver-core: use klist for class device list and implement iterator Iterating over entries using callback usually isn't too fun especially when the entry being iterated over can't be manipulated freely. This patch converts class->p->class_devices to klist and implements class device iterator so that the users can freely build their own control structure. The users are also free to call back into class code without worrying about locking. class_for_each_device() and class_find_device() are converted to use the new iterators, so their users don't have to worry about locking anymore either. Note: This depends on klist-dont-iterate-over-deleted-entries patch because class_intf->add/remove_dev() depends on proper synchronization with device removal. Signed-off-by: Tejun Heo Cc: Greg Kroah-Hartman Cc: Jens Axboe Signed-off-by: Jens Axboe --- include/linux/device.h | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) (limited to 'include/linux/device.h') diff --git a/include/linux/device.h b/include/linux/device.h index 4d8372d135df..246937c9cbc7 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -199,6 +199,11 @@ struct class { struct class_private *p; }; +struct class_dev_iter { + struct klist_iter ki; + const struct device_type *type; +}; + extern struct kobject *sysfs_dev_block_kobj; extern struct kobject *sysfs_dev_char_kobj; extern int __must_check __class_register(struct class *class, @@ -213,6 +218,13 @@ extern void class_unregister(struct class *class); __class_register(class, &__key); \ }) +extern void class_dev_iter_init(struct class_dev_iter *iter, + struct class *class, + struct device *start, + const struct device_type *type); +extern struct device *class_dev_iter_next(struct class_dev_iter *iter); +extern void class_dev_iter_exit(struct class_dev_iter *iter); + extern int class_for_each_device(struct class *class, struct device *start, void *data, int (*fn)(struct device *dev, void *data)); @@ -396,7 +408,7 @@ struct device { spinlock_t devres_lock; struct list_head devres_head; - struct list_head node; + struct klist_node knode_class; struct class *class; dev_t devt; /* dev_t, creates the sysfs "dev" */ struct attribute_group **groups; /* optional groups */ -- cgit v1.2.3