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Driver Core: add ability for class_for_each_device to start in middle of list

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This mirrors the functionality that driver_for_each_device has as well.

We add a start variable, and all callers of the function are fixed up at
the same time.

The block layer will be using this new functionality in a follow-on
patch.


Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman
2008-05-22 17:21:08 -04:00
parent 4e10673944
commit 93562b5376
6 changed files with 31 additions and 19 deletions
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21
drivers/base/class.c
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@ -256,11 +256,14 @@ char *make_class_name(const char *name, struct kobject *kobj)
/**
* class_for_each_device - device iterator
* @class: the class we're iterating
* @start: the device to start with in the list, if any.
* @data: data for the callback
* @fn: function to be called for each device
*
* Iterate over @class's list of devices, and call @fn for each,
* passing it @data.
* passing it @data. If @start is set, the list iteration will start
* there, otherwise if it is NULL, the iteration starts at the
* beginning of the list.
*
* We check the return of @fn each time. If it returns anything
* other than 0, we break out and return that value.
@ -269,8 +272,8 @@ char *make_class_name(const char *name, struct kobject *kobj)
* re-acquired in @fn, otherwise it will self-deadlocking. For
* example, calls to add or remove class members would be verboten.
*/
int class_for_each_device(struct class *class, void *data,
int (*fn)(struct device *, void *))
int class_for_each_device(struct class *class, struct device *start,
void *data, int (*fn)(struct device *, void *))
{
struct device *dev;
int error = 0;
@ -279,12 +282,14 @@ int class_for_each_device(struct class *class, void *data,
return -EINVAL;
down(&class->sem);
list_for_each_entry(dev, &class->devices, node) {
if (start) {
if (start == dev)
start = NULL;
continue;
}
dev = get_device(dev);
if (dev) {
error = fn(dev, data);
put_device(dev);
} else
error = -ENODEV;
error = fn(dev, data);
put_device(dev);
if (error)
break;
}