1 // SPDX-License-Identifier: GPL-2.0
28 	} *probes[255];
36 	unsigned int n = MAJOR(dev + range - 1) - MAJOR(dev) + 1;  in kobj_map()
41 	if (n > 255)  in kobj_map()
42 		n = 255;  in kobj_map()
46 		return -ENOMEM;  in kobj_map()
49 		p->owner = module;  in kobj_map()
50 		p->get = probe;  in kobj_map()
51 		p->lock = lock;  in kobj_map()
52 		p->dev = dev;  in kobj_map()
53 		p->range = range;  in kobj_map()
54 		p->data = data;  in kobj_map()
56 	mutex_lock(domain->lock);  in kobj_map()
57 	for (i = 0, p -= n; i < n; i++, p++, index++) {  in kobj_map()
58 		struct probe **s = &domain->probes[index % 255];  in kobj_map()
59 		while (*s && (*s)->range < range)  in kobj_map()
60 			s = &(*s)->next;  in kobj_map()
61 		p->next = *s;  in kobj_map()
64 	mutex_unlock(domain->lock);  in kobj_map()
70 	unsigned int n = MAJOR(dev + range - 1) - MAJOR(dev) + 1;  in kobj_unmap()
75 	if (n > 255)  in kobj_unmap()
76 		n = 255;  in kobj_unmap()
78 	mutex_lock(domain->lock);  in kobj_unmap()
81 		for (s = &domain->probes[index % 255]; *s; s = &(*s)->next) {  in kobj_unmap()
83 			if (p->dev == dev && p->range == range) {  in kobj_unmap()
84 				*s = p->next;  in kobj_unmap()
91 	mutex_unlock(domain->lock);  in kobj_unmap()
102 	mutex_lock(domain->lock);  in kobj_lookup()
103 	for (p = domain->probes[MAJOR(dev) % 255]; p; p = p->next) {  in kobj_lookup()
108 		if (p->dev > dev || p->dev + p->range - 1 < dev)  in kobj_lookup()
110 		if (p->range - 1 >= best)  in kobj_lookup()
112 		if (!try_module_get(p->owner))  in kobj_lookup()
114 		owner = p->owner;  in kobj_lookup()
115 		data = p->data;  in kobj_lookup()
116 		probe = p->get;  in kobj_lookup()
117 		best = p->range - 1;  in kobj_lookup()
118 		*index = dev - p->dev;  in kobj_lookup()
119 		if (p->lock && p->lock(dev, data) < 0) {  in kobj_lookup()
123 		mutex_unlock(domain->lock);  in kobj_lookup()
125 		/* Currently ->owner protects _only_ ->probe() itself. */  in kobj_lookup()
131 	mutex_unlock(domain->lock);  in kobj_lookup()
147 	base->dev = 1;  in kobj_map_init()
148 	base->range = ~0;  in kobj_map_init()
149 	base->get = base_probe;  in kobj_map_init()
150 	for (i = 0; i < 255; i++)  in kobj_map_init()
151 		p->probes[i] = base;  in kobj_map_init()
152 	p->lock = lock;  in kobj_map_init()