void dev_coredumpm()

in devcoredump.c [248:312]

• 49 lines of code
• 8 McCabe index (conditional complexity)

void dev_coredumpm(struct device *dev, struct module *owner,
		   void *data, size_t datalen, gfp_t gfp,
		   ssize_t (*read)(char *buffer, loff_t offset, size_t count,
				   void *data, size_t datalen),
		   void (*free)(void *data))
{
	static atomic_t devcd_count = ATOMIC_INIT(0);
	struct devcd_entry *devcd;
	struct device *existing;

	if (devcd_disabled)
		goto free;

	existing = class_find_device(&devcd_class, NULL, dev,
				     devcd_match_failing);
	if (existing) {
		put_device(existing);
		goto free;
	}

	if (!try_module_get(owner))
		goto free;

	devcd = kzalloc(sizeof(*devcd), gfp);
	if (!devcd)
		goto put_module;

	devcd->owner = owner;
	devcd->data = data;
	devcd->datalen = datalen;
	devcd->read = read;
	devcd->free = free;
	devcd->failing_dev = get_device(dev);

	device_initialize(&devcd->devcd_dev);

	dev_set_name(&devcd->devcd_dev, "devcd%d",
		     atomic_inc_return(&devcd_count));
	devcd->devcd_dev.class = &devcd_class;

	if (device_add(&devcd->devcd_dev))
		goto put_device;

	/*
	 * These should normally not fail, but there is no problem
	 * continuing without the links, so just warn instead of
	 * failing.
	 */
	if (sysfs_create_link(&devcd->devcd_dev.kobj, &dev->kobj,
			      "failing_device") ||
	    sysfs_create_link(&dev->kobj, &devcd->devcd_dev.kobj,
		              "devcoredump"))
		dev_warn(dev, "devcoredump create_link failed\n");

	INIT_DELAYED_WORK(&devcd->del_wk, devcd_del);
	schedule_delayed_work(&devcd->del_wk, DEVCD_TIMEOUT);

	return;
 put_device:
	put_device(&devcd->devcd_dev);
 put_module:
	module_put(owner);
 free:
	free(data);
}