/* Deprecated, do not use.  Moved from module.c to here. --RR */ /* Written by Keith Owens <kaos@ocs.com.au> Oct 2000 */#include <linux/module.h>#include <linux/kmod.h>#include <linux/spinlock.h>#include <linux/list.h>#include <linux/slab.h> /* inter_module functions are always available, even when the kernel is * compiled without modules.  Consumers of inter_module_xxx routines * will always work, even when both are built into the kernel, this * approach removes lots of #ifdefs in mainline code. */ static struct list_head ime_list = LIST_HEAD_INIT(ime_list);static DEFINE_SPINLOCK(ime_lock);static int kmalloc_failed; struct inter_module_entry {	struct list_head list;	const char *im_name;	struct module *owner;	const void *userdata;}; /** * inter_module_register - register a new set of inter module data. * @im_name: an arbitrary string to identify the data, must be unique * @owner: module that is registering the data, always use THIS_MODULE * @userdata: pointer to arbitrary userdata to be registered * * Description: Check that the im_name has not already been registered, * complain if it has.  For new data, add it to the inter_module_entry * list. */void inter_module_register(const char *im_name, struct module *owner, const void *userdata){	struct list_head *tmp;	struct inter_module_entry *ime, *ime_new; 	if (!(ime_new = kzalloc(sizeof(*ime), GFP_KERNEL))) {		/* Overloaded kernel, not fatal */		printk(KERN_ERR			"Aiee, inter_module_register: cannot kmalloc entry for '%s'\n",			im_name);		kmalloc_failed = 1;		return;	}	ime_new->im_name = im_name;	ime_new->owner = owner;	ime_new->userdata = userdata; 	spin_lock(&ime_lock);	list_for_each(tmp, &ime_list) {		ime = list_entry(tmp, struct inter_module_entry, list);		if (strcmp(ime->im_name, im_name) == 0) {			spin_unlock(&ime_lock);			kfree(ime_new);			/* Program logic error, fatal */			printk(KERN_ERR "inter_module_register: duplicate im_name '%s'", im_name);			BUG();		}	}	list_add(&(ime_new->list), &ime_list);	spin_unlock(&ime_lock);} /** * inter_module_unregister - unregister a set of inter module data. * @im_name: an arbitrary string to identify the data, must be unique * * Description: Check that the im_name has been registered, complain if * it has not.  For existing data, remove it from the * inter_module_entry list. */void inter_module_unregister(const char *im_name){	struct list_head *tmp;	struct inter_module_entry *ime; 	spin_lock(&ime_lock);	list_for_each(tmp, &ime_list) {		ime = list_entry(tmp, struct inter_module_entry, list);		if (strcmp(ime->im_name, im_name) == 0) {			list_del(&(ime->list));			spin_unlock(&ime_lock);			kfree(ime);			return;		}	}	spin_unlock(&ime_lock);	if (kmalloc_failed) {		printk(KERN_ERR			"inter_module_unregister: no entry for '%s', "			"probably caused by previous kmalloc failure\n",			im_name);		return;	}	else {		/* Program logic error, fatal */		printk(KERN_ERR "inter_module_unregister: no entry for '%s'", im_name);		BUG();	}} /** * inter_module_get - return arbitrary userdata from another module. * @im_name: an arbitrary string to identify the data, must be unique * * Description: If the im_name has not been registered, return NULL. * Try to increment the use count on the owning module, if that fails * then return NULL.  Otherwise return the userdata. */static const void *inter_module_get(const char *im_name){	struct list_head *tmp;	struct inter_module_entry *ime;	const void *result = NULL; 	spin_lock(&ime_lock);	list_for_each(tmp, &ime_list) {		ime = list_entry(tmp, struct inter_module_entry, list);		if (strcmp(ime->im_name, im_name) == 0) {			if (try_module_get(ime->owner))				result = ime->userdata;			break;		}	}	spin_unlock(&ime_lock);	return(result);} /** * inter_module_get_request - im get with automatic request_module. * @im_name: an arbitrary string to identify the data, must be unique * @modname: module that is expected to register im_name * * Description: If inter_module_get fails, do request_module then retry. */const void *inter_module_get_request(const char *im_name, const char *modname){	const void *result = inter_module_get(im_name);	if (!result) {		request_module("%s", modname);		result = inter_module_get(im_name);	}	return(result);} /** * inter_module_put - release use of data from another module. * @im_name: an arbitrary string to identify the data, must be unique * * Description: If the im_name has not been registered, complain, * otherwise decrement the use count on the owning module. */void inter_module_put(const char *im_name){	struct list_head *tmp;	struct inter_module_entry *ime; 	spin_lock(&ime_lock);	list_for_each(tmp, &ime_list) {		ime = list_entry(tmp, struct inter_module_entry, list);		if (strcmp(ime->im_name, im_name) == 0) {			if (ime->owner)				module_put(ime->owner);			spin_unlock(&ime_lock);			return;		}	}	spin_unlock(&ime_lock);	printk(KERN_ERR "inter_module_put: no entry for '%s'", im_name);	BUG();} EXPORT_SYMBOL(inter_module_register);EXPORT_SYMBOL(inter_module_unregister);EXPORT_SYMBOL(inter_module_get_request);EXPORT_SYMBOL(inter_module_put); MODULE_LICENSE("GPL");