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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Now that the SPDX tag is in all driver core files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Johannes Berg <johannes@sipsolutions.net> Cc: "Luis R. Rodriguez" <mcgrof@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
154 lines
3.3 KiB
C
154 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/drivers/base/map.c
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*
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* (C) Copyright Al Viro 2002,2003
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*
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* NOTE: data structure needs to be changed. It works, but for large dev_t
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* it will be too slow. It is isolated, though, so these changes will be
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* local to that file.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/kdev_t.h>
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#include <linux/kobject.h>
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#include <linux/kobj_map.h>
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struct kobj_map {
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struct probe {
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struct probe *next;
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dev_t dev;
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unsigned long range;
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struct module *owner;
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kobj_probe_t *get;
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int (*lock)(dev_t, void *);
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void *data;
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} *probes[255];
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struct mutex *lock;
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};
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int kobj_map(struct kobj_map *domain, dev_t dev, unsigned long range,
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struct module *module, kobj_probe_t *probe,
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int (*lock)(dev_t, void *), void *data)
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{
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unsigned n = MAJOR(dev + range - 1) - MAJOR(dev) + 1;
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unsigned index = MAJOR(dev);
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unsigned i;
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struct probe *p;
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if (n > 255)
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n = 255;
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p = kmalloc_array(n, sizeof(struct probe), GFP_KERNEL);
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if (p == NULL)
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return -ENOMEM;
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for (i = 0; i < n; i++, p++) {
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p->owner = module;
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p->get = probe;
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p->lock = lock;
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p->dev = dev;
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p->range = range;
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p->data = data;
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}
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mutex_lock(domain->lock);
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for (i = 0, p -= n; i < n; i++, p++, index++) {
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struct probe **s = &domain->probes[index % 255];
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while (*s && (*s)->range < range)
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s = &(*s)->next;
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p->next = *s;
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*s = p;
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}
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mutex_unlock(domain->lock);
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return 0;
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}
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void kobj_unmap(struct kobj_map *domain, dev_t dev, unsigned long range)
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{
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unsigned n = MAJOR(dev + range - 1) - MAJOR(dev) + 1;
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unsigned index = MAJOR(dev);
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unsigned i;
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struct probe *found = NULL;
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if (n > 255)
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n = 255;
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mutex_lock(domain->lock);
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for (i = 0; i < n; i++, index++) {
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struct probe **s;
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for (s = &domain->probes[index % 255]; *s; s = &(*s)->next) {
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struct probe *p = *s;
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if (p->dev == dev && p->range == range) {
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*s = p->next;
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if (!found)
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found = p;
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break;
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}
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}
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}
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mutex_unlock(domain->lock);
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kfree(found);
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}
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struct kobject *kobj_lookup(struct kobj_map *domain, dev_t dev, int *index)
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{
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struct kobject *kobj;
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struct probe *p;
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unsigned long best = ~0UL;
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retry:
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mutex_lock(domain->lock);
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for (p = domain->probes[MAJOR(dev) % 255]; p; p = p->next) {
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struct kobject *(*probe)(dev_t, int *, void *);
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struct module *owner;
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void *data;
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if (p->dev > dev || p->dev + p->range - 1 < dev)
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continue;
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if (p->range - 1 >= best)
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break;
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if (!try_module_get(p->owner))
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continue;
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owner = p->owner;
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data = p->data;
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probe = p->get;
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best = p->range - 1;
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*index = dev - p->dev;
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if (p->lock && p->lock(dev, data) < 0) {
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module_put(owner);
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continue;
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}
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mutex_unlock(domain->lock);
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kobj = probe(dev, index, data);
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/* Currently ->owner protects _only_ ->probe() itself. */
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module_put(owner);
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if (kobj)
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return kobj;
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goto retry;
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}
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mutex_unlock(domain->lock);
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return NULL;
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}
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struct kobj_map *kobj_map_init(kobj_probe_t *base_probe, struct mutex *lock)
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{
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struct kobj_map *p = kmalloc(sizeof(struct kobj_map), GFP_KERNEL);
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struct probe *base = kzalloc(sizeof(*base), GFP_KERNEL);
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int i;
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if ((p == NULL) || (base == NULL)) {
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kfree(p);
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kfree(base);
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return NULL;
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}
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base->dev = 1;
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base->range = ~0;
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base->get = base_probe;
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for (i = 0; i < 255; i++)
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p->probes[i] = base;
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p->lock = lock;
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return p;
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}
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