mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 08:02:30 +00:00
3f07c01441
We are going to split <linux/sched/signal.h> out of <linux/sched.h>, which will have to be picked up from other headers and a couple of .c files. Create a trivial placeholder <linux/sched/signal.h> file that just maps to <linux/sched.h> to make this patch obviously correct and bisectable. Include the new header in the files that are going to need it. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
141 lines
3 KiB
C
141 lines
3 KiB
C
/*
|
|
* Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/spinlock.h>
|
|
#include <linux/list.h>
|
|
#include <linux/sched/signal.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/export.h>
|
|
|
|
#include "w1_family.h"
|
|
#include "w1.h"
|
|
|
|
DEFINE_SPINLOCK(w1_flock);
|
|
static LIST_HEAD(w1_families);
|
|
|
|
/**
|
|
* w1_register_family() - register a device family driver
|
|
* @newf: family to register
|
|
*/
|
|
int w1_register_family(struct w1_family *newf)
|
|
{
|
|
struct list_head *ent, *n;
|
|
struct w1_family *f;
|
|
int ret = 0;
|
|
|
|
spin_lock(&w1_flock);
|
|
list_for_each_safe(ent, n, &w1_families) {
|
|
f = list_entry(ent, struct w1_family, family_entry);
|
|
|
|
if (f->fid == newf->fid) {
|
|
ret = -EEXIST;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!ret) {
|
|
atomic_set(&newf->refcnt, 0);
|
|
list_add_tail(&newf->family_entry, &w1_families);
|
|
}
|
|
spin_unlock(&w1_flock);
|
|
|
|
/* check default devices against the new set of drivers */
|
|
w1_reconnect_slaves(newf, 1);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* w1_unregister_family() - unregister a device family driver
|
|
* @fent: family to unregister
|
|
*/
|
|
void w1_unregister_family(struct w1_family *fent)
|
|
{
|
|
struct list_head *ent, *n;
|
|
struct w1_family *f;
|
|
|
|
spin_lock(&w1_flock);
|
|
list_for_each_safe(ent, n, &w1_families) {
|
|
f = list_entry(ent, struct w1_family, family_entry);
|
|
|
|
if (f->fid == fent->fid) {
|
|
list_del(&fent->family_entry);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&w1_flock);
|
|
|
|
/* deatch devices using this family code */
|
|
w1_reconnect_slaves(fent, 0);
|
|
|
|
while (atomic_read(&fent->refcnt)) {
|
|
pr_info("Waiting for family %u to become free: refcnt=%d.\n",
|
|
fent->fid, atomic_read(&fent->refcnt));
|
|
|
|
if (msleep_interruptible(1000))
|
|
flush_signals(current);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Should be called under w1_flock held.
|
|
*/
|
|
struct w1_family * w1_family_registered(u8 fid)
|
|
{
|
|
struct list_head *ent, *n;
|
|
struct w1_family *f = NULL;
|
|
int ret = 0;
|
|
|
|
list_for_each_safe(ent, n, &w1_families) {
|
|
f = list_entry(ent, struct w1_family, family_entry);
|
|
|
|
if (f->fid == fid) {
|
|
ret = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return (ret) ? f : NULL;
|
|
}
|
|
|
|
static void __w1_family_put(struct w1_family *f)
|
|
{
|
|
atomic_dec(&f->refcnt);
|
|
}
|
|
|
|
void w1_family_put(struct w1_family *f)
|
|
{
|
|
spin_lock(&w1_flock);
|
|
__w1_family_put(f);
|
|
spin_unlock(&w1_flock);
|
|
}
|
|
|
|
#if 0
|
|
void w1_family_get(struct w1_family *f)
|
|
{
|
|
spin_lock(&w1_flock);
|
|
__w1_family_get(f);
|
|
spin_unlock(&w1_flock);
|
|
}
|
|
#endif /* 0 */
|
|
|
|
void __w1_family_get(struct w1_family *f)
|
|
{
|
|
smp_mb__before_atomic();
|
|
atomic_inc(&f->refcnt);
|
|
smp_mb__after_atomic();
|
|
}
|
|
|
|
EXPORT_SYMBOL(w1_unregister_family);
|
|
EXPORT_SYMBOL(w1_register_family);
|