1 // SPDX-License-Identifier: GPL-2.0
34  * This must be called with mon_lock taken because of mbus->ref.
41 	spin_lock_irqsave(&mbus->lock, flags);  in mon_reader_add()
42 	if (mbus->nreaders == 0) {  in mon_reader_add()
45 				struct mon_bus *m1;  in mon_reader_add()  local
46 				m1 = list_entry(p, struct mon_bus, bus_link);  in mon_reader_add()
47 				m1->u_bus->monitored = 1;  in mon_reader_add()
50 			mbus->u_bus->monitored = 1;  in mon_reader_add()
53 	mbus->nreaders++;  in mon_reader_add()
54 	list_add_tail(&r->r_link, &mbus->r_list);  in mon_reader_add()
55 	spin_unlock_irqrestore(&mbus->lock, flags);  in mon_reader_add()
57 	kref_get(&mbus->ref);  in mon_reader_add()
63  * This is called with mon_lock taken, so we can decrement mbus->ref.
69 	spin_lock_irqsave(&mbus->lock, flags);  in mon_reader_del()
70 	list_del(&r->r_link);  in mon_reader_del()
71 	--mbus->nreaders;  in mon_reader_del()
72 	if (mbus->nreaders == 0)  in mon_reader_del()
74 	spin_unlock_irqrestore(&mbus->lock, flags);  in mon_reader_del()
76 	kref_put(&mbus->ref, mon_bus_drop);  in mon_reader_del()
86 	spin_lock_irqsave(&mbus->lock, flags);  in mon_bus_submit()
87 	mbus->cnt_events++;  in mon_bus_submit()
88 	list_for_each_entry(r, &mbus->r_list, r_link)  in mon_bus_submit()
89 		r->rnf_submit(r->r_data, urb);  in mon_bus_submit()
90 	spin_unlock_irqrestore(&mbus->lock, flags);  in mon_bus_submit()
97 	mbus = ubus->mon_bus;  in mon_submit()
110 	spin_lock_irqsave(&mbus->lock, flags);  in mon_bus_submit_error()
111 	mbus->cnt_events++;  in mon_bus_submit_error()
112 	list_for_each_entry(r, &mbus->r_list, r_link)  in mon_bus_submit_error()
113 		r->rnf_error(r->r_data, urb, error);  in mon_bus_submit_error()
114 	spin_unlock_irqrestore(&mbus->lock, flags);  in mon_bus_submit_error()
121 	mbus = ubus->mon_bus;  in mon_submit_error()
134 	spin_lock_irqsave(&mbus->lock, flags);  in mon_bus_complete()
135 	mbus->cnt_events++;  in mon_bus_complete()
136 	list_for_each_entry(r, &mbus->r_list, r_link)  in mon_bus_complete()
137 		r->rnf_complete(r->r_data, urb, status);  in mon_bus_complete()
138 	spin_unlock_irqrestore(&mbus->lock, flags);  in mon_bus_complete()
145 	mbus = ubus->mon_bus;  in mon_complete()
165 			if (mbus->nreaders == 0 && (ubus = mbus->u_bus) != NULL)  in mon_stop()
166 				ubus->monitored = 0;  in mon_stop()
171 		 * a reader staying across an rmmod foo_hcd, so test ->u_bus.  in mon_stop()
173 		if (mon_bus0.nreaders == 0 && (ubus = mbus->u_bus) != NULL) {  in mon_stop()
174 			ubus->monitored = 0;  in mon_stop()
181  * Add a USB bus (usually by a modprobe foo-hcd)
191 		ubus->monitored = 1;  in mon_bus_add()
196  * Remove a USB bus (either from rmmod foo-hcd or from a hot-remove event).
200 	struct mon_bus *mbus = ubus->mon_bus;  in mon_bus_remove()
203 	list_del(&mbus->bus_link);  in mon_bus_remove()
204 	if (mbus->text_inited)  in mon_bus_remove()
206 	if (mbus->bin_inited)  in mon_bus_remove()
210 	kref_put(&mbus->ref, mon_bus_drop);  in mon_bus_remove()
246 	if (ubus->monitored) {  in mon_dissolve()
247 		ubus->monitored = 0;  in mon_dissolve()
251 	ubus->mon_bus = NULL;  in mon_dissolve()
252 	mbus->u_bus = NULL;  in mon_dissolve()
268  *  - allocate mon_bus
269  *  - refcount USB bus struct
270  *  - link
279 	kref_init(&mbus->ref);  in mon_bus_init()
280 	spin_lock_init(&mbus->lock);  in mon_bus_init()
281 	INIT_LIST_HEAD(&mbus->r_list);  in mon_bus_init()
287 	mbus->u_bus = ubus;  in mon_bus_init()
288 	ubus->mon_bus = mbus;  in mon_bus_init()
290 	mbus->text_inited = mon_text_add(mbus, ubus);  in mon_bus_init()
291 	mbus->bin_inited = mon_bin_add(mbus, ubus);  in mon_bus_init()
294 	list_add_tail(&mbus->bus_link, &mon_buses);  in mon_bus_init()
306 	kref_init(&mbus->ref);  in mon_bus0_init()
307 	spin_lock_init(&mbus->lock);  in mon_bus0_init()
308 	INIT_LIST_HEAD(&mbus->r_list);  in mon_bus0_init()
310 	mbus->text_inited = mon_text_add(mbus, NULL);  in mon_bus0_init()
311 	mbus->bin_inited = mon_bin_add(mbus, NULL);  in mon_bus0_init()
330 		if (mbus->u_bus->busnum == num) {  in mon_bus_lookup()
351 		rc = -ENODEV;  in mon_init()
386 		if (mbus->text_inited)  in mon_exit()
388 		if (mbus->bin_inited)  in mon_exit()
396 		if (mbus->nreaders) {  in mon_exit()
399 			    mbus->nreaders, mbus->u_bus->busnum);  in mon_exit()
400 			kref_get(&mbus->ref); /* Force leak */  in mon_exit()
403 		mon_dissolve(mbus, mbus->u_bus);  in mon_exit()
404 		kref_put(&mbus->ref, mon_bus_drop);  in mon_exit()
408 	if (mbus->text_inited)  in mon_exit()
410 	if (mbus->bin_inited)  in mon_exit()