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|
/* $OpenBSD: subr_autoconf.c,v 1.64 2011/06/01 03:25:01 matthew Exp $ */
/* $NetBSD: subr_autoconf.c,v 1.21 1996/04/04 06:06:18 cgd Exp $ */
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Berkeley Laboratories.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: Header: subr_autoconf.c,v 1.12 93/02/01 19:31:48 torek Exp (LBL)
*
* @(#)subr_autoconf.c 8.1 (Berkeley) 6/10/93
*/
#include <sys/param.h>
#include <sys/device.h>
#include <sys/hotplug.h>
#include <sys/limits.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/queue.h>
#include <sys/proc.h>
#include "hotplug.h"
/*
* Autoconfiguration subroutines.
*/
/*
* ioconf.c exports exactly two names: cfdata and cfroots. All system
* devices and drivers are found via these tables.
*/
extern short cfroots[];
#define ROOT ((struct device *)NULL)
struct matchinfo {
cfmatch_t fn;
struct device *parent;
void *match, *aux;
int indirect, pri;
};
struct cftable_head allcftables;
static struct cftable staticcftable = {
cfdata
};
#ifndef AUTOCONF_VERBOSE
#define AUTOCONF_VERBOSE 0
#endif /* AUTOCONF_VERBOSE */
int autoconf_verbose = AUTOCONF_VERBOSE; /* trace probe calls */
static void mapply(struct matchinfo *, struct cfdata *);
struct deferred_config {
TAILQ_ENTRY(deferred_config) dc_queue;
struct device *dc_dev;
void (*dc_func)(struct device *);
};
TAILQ_HEAD(, deferred_config) deferred_config_queue;
void config_process_deferred_children(struct device *);
struct devicelist alldevs; /* list of all devices */
__volatile int config_pending; /* semaphore for mountroot */
/*
* Initialize autoconfiguration data structures. This occurs before console
* initialization as that might require use of this subsystem. Furthermore
* this means that malloc et al. isn't yet available.
*/
void
config_init(void)
{
TAILQ_INIT(&deferred_config_queue);
TAILQ_INIT(&alldevs);
TAILQ_INIT(&allcftables);
TAILQ_INSERT_TAIL(&allcftables, &staticcftable, list);
}
/*
* Apply the matching function and choose the best. This is used
* a few times and we want to keep the code small.
*/
void
mapply(struct matchinfo *m, struct cfdata *cf)
{
int pri;
void *match;
if (m->indirect)
match = config_make_softc(m->parent, cf);
else
match = cf;
if (autoconf_verbose) {
printf(">>> probing for %s", cf->cf_driver->cd_name);
if (cf->cf_fstate == FSTATE_STAR)
printf("*\n");
else
printf("%d\n", cf->cf_unit);
}
if (m->fn != NULL)
pri = (*m->fn)(m->parent, match, m->aux);
else {
if (cf->cf_attach->ca_match == NULL) {
panic("mapply: no match function for '%s' device",
cf->cf_driver->cd_name);
}
pri = (*cf->cf_attach->ca_match)(m->parent, match, m->aux);
}
if (autoconf_verbose)
printf(">>> %s probe returned %d\n", cf->cf_driver->cd_name,
pri);
if (pri > m->pri) {
if (m->indirect && m->match)
free(m->match, M_DEVBUF);
m->match = match;
m->pri = pri;
} else {
if (m->indirect)
free(match, M_DEVBUF);
}
}
/*
* Iterate over all potential children of some device, calling the given
* function (default being the child's match function) for each one.
* Nonzero returns are matches; the highest value returned is considered
* the best match. Return the `found child' if we got a match, or NULL
* otherwise. The `aux' pointer is simply passed on through.
*
* Note that this function is designed so that it can be used to apply
* an arbitrary function to all potential children (its return value
* can be ignored).
*/
void *
config_search(cfmatch_t fn, struct device *parent, void *aux)
{
struct cfdata *cf;
short *p;
struct matchinfo m;
struct cftable *t;
m.fn = fn;
m.parent = parent;
m.match = NULL;
m.aux = aux;
m.indirect = parent && parent->dv_cfdata->cf_driver->cd_indirect;
m.pri = 0;
TAILQ_FOREACH(t, &allcftables, list) {
for (cf = t->tab; cf->cf_driver; cf++) {
/*
* Skip cf if no longer eligible, otherwise scan
* through parents for one matching `parent',
* and try match function.
*/
if (cf->cf_fstate == FSTATE_FOUND)
continue;
if (cf->cf_fstate == FSTATE_DNOTFOUND ||
cf->cf_fstate == FSTATE_DSTAR)
continue;
for (p = cf->cf_parents; *p >= 0; p++)
if (parent->dv_cfdata == &(t->tab)[*p])
mapply(&m, cf);
}
}
if (autoconf_verbose) {
if (m.match) {
if (m.indirect)
cf = ((struct device *)m.match)->dv_cfdata;
else
cf = (struct cfdata *)m.match;
printf(">>> %s probe won\n",
cf->cf_driver->cd_name);
} else
printf(">>> no winning probe\n");
}
return (m.match);
}
/*
* Iterate over all potential children of some device, calling the given
* function for each one.
*
* Note that this function is designed so that it can be used to apply
* an arbitrary function to all potential children (its return value
* can be ignored).
*/
void
config_scan(cfscan_t fn, struct device *parent)
{
struct cfdata *cf;
short *p;
void *match;
int indirect;
struct cftable *t;
indirect = parent && parent->dv_cfdata->cf_driver->cd_indirect;
TAILQ_FOREACH(t, &allcftables, list) {
for (cf = t->tab; cf->cf_driver; cf++) {
/*
* Skip cf if no longer eligible, otherwise scan
* through parents for one matching `parent',
* and try match function.
*/
if (cf->cf_fstate == FSTATE_FOUND)
continue;
if (cf->cf_fstate == FSTATE_DNOTFOUND ||
cf->cf_fstate == FSTATE_DSTAR)
continue;
for (p = cf->cf_parents; *p >= 0; p++)
if (parent->dv_cfdata == &(t->tab)[*p]) {
match = indirect?
config_make_softc(parent, cf) :
(void *)cf;
(*fn)(parent, match);
}
}
}
}
/*
* Find the given root device.
* This is much like config_search, but there is no parent.
*/
void *
config_rootsearch(cfmatch_t fn, char *rootname, void *aux)
{
struct cfdata *cf;
short *p;
struct matchinfo m;
m.fn = fn;
m.parent = ROOT;
m.match = NULL;
m.aux = aux;
m.indirect = 0;
m.pri = 0;
/*
* Look at root entries for matching name. We do not bother
* with found-state here since only one instance of each possible
* root child should ever be searched.
*/
for (p = cfroots; *p >= 0; p++) {
cf = &cfdata[*p];
if (cf->cf_fstate == FSTATE_DNOTFOUND ||
cf->cf_fstate == FSTATE_DSTAR)
continue;
if (strcmp(cf->cf_driver->cd_name, rootname) == 0)
mapply(&m, cf);
}
return (m.match);
}
char *msgs[3] = { "", " not configured\n", " unsupported\n" };
/*
* The given `aux' argument describes a device that has been found
* on the given parent, but not necessarily configured. Locate the
* configuration data for that device (using the submatch function
* provided, or using candidates' cd_match configuration driver
* functions) and attach it, and return true. If the device was
* not configured, call the given `print' function and return 0.
*/
struct device *
config_found_sm(struct device *parent, void *aux, cfprint_t print,
cfmatch_t submatch)
{
void *match;
if ((match = config_search(submatch, parent, aux)) != NULL)
return (config_attach(parent, match, aux, print));
if (print)
printf(msgs[(*print)(aux, parent->dv_xname)]);
return (NULL);
}
/*
* As above, but for root devices.
*/
struct device *
config_rootfound(char *rootname, void *aux)
{
void *match;
if ((match = config_rootsearch((cfmatch_t)NULL, rootname, aux)) != NULL)
return (config_attach(ROOT, match, aux, (cfprint_t)NULL));
printf("root device %s not configured\n", rootname);
return (NULL);
}
/*
* Attach a found device. Allocates memory for device variables.
*/
struct device *
config_attach(struct device *parent, void *match, void *aux, cfprint_t print)
{
struct cfdata *cf;
struct device *dev;
struct cfdriver *cd;
struct cfattach *ca;
struct cftable *t;
if (parent && parent->dv_cfdata->cf_driver->cd_indirect) {
dev = match;
cf = dev->dv_cfdata;
} else {
cf = match;
dev = config_make_softc(parent, cf);
}
cd = cf->cf_driver;
ca = cf->cf_attach;
KASSERT(cd->cd_devs != NULL);
KASSERT(dev->dv_unit < cd->cd_ndevs);
KASSERT(cd->cd_devs[dev->dv_unit] == NULL);
cd->cd_devs[dev->dv_unit] = dev;
/*
* If this is a "STAR" device and we used the last unit, prepare for
* another one.
*/
if (cf->cf_fstate == FSTATE_STAR) {
if (dev->dv_unit == cf->cf_unit)
cf->cf_unit++;
} else
cf->cf_fstate = FSTATE_FOUND;
TAILQ_INSERT_TAIL(&alldevs, dev, dv_list);
device_ref(dev);
if (parent == ROOT)
printf("%s at root", dev->dv_xname);
else {
printf("%s at %s", dev->dv_xname, parent->dv_xname);
if (print)
(void) (*print)(aux, (char *)0);
}
/*
* Before attaching, clobber any unfound devices that are
* otherwise identical, or bump the unit number on all starred
* cfdata for this device.
*/
TAILQ_FOREACH(t, &allcftables, list) {
for (cf = t->tab; cf->cf_driver; cf++)
if (cf->cf_driver == cd &&
cf->cf_unit == dev->dv_unit) {
if (cf->cf_fstate == FSTATE_NOTFOUND)
cf->cf_fstate = FSTATE_FOUND;
if (cf->cf_fstate == FSTATE_STAR)
cf->cf_unit++;
}
}
device_register(dev, aux);
(*ca->ca_attach)(parent, dev, aux);
config_process_deferred_children(dev);
#if NHOTPLUG > 0
if (!cold)
hotplug_device_attach(cd->cd_class, dev->dv_xname);
#endif
return (dev);
}
struct device *
config_make_softc(struct device *parent, struct cfdata *cf)
{
struct device *dev;
struct cfdriver *cd;
struct cfattach *ca;
cd = cf->cf_driver;
ca = cf->cf_attach;
if (ca->ca_devsize < sizeof(struct device))
panic("config_make_softc");
/* get memory for all device vars */
dev = malloc(ca->ca_devsize, M_DEVBUF, M_NOWAIT|M_ZERO);
if (!dev)
panic("config_make_softc: allocation for device softc failed");
dev->dv_class = cd->cd_class;
dev->dv_cfdata = cf;
dev->dv_flags = DVF_ACTIVE; /* always initially active */
/* If this is a STAR device, search for a free unit number */
if (cf->cf_fstate == FSTATE_STAR) {
for (dev->dv_unit = cf->cf_starunit1;
dev->dv_unit < cf->cf_unit; dev->dv_unit++)
if (cd->cd_ndevs == 0 ||
dev->dv_unit >= cd->cd_ndevs ||
cd->cd_devs[dev->dv_unit] == NULL)
break;
} else
dev->dv_unit = cf->cf_unit;
/* Build the device name into dv_xname. */
if (snprintf(dev->dv_xname, sizeof(dev->dv_xname), "%s%d",
cd->cd_name, dev->dv_unit) >= sizeof(dev->dv_xname))
panic("config_make_softc: device name too long");
dev->dv_parent = parent;
/* put this device in the devices array */
if (dev->dv_unit >= cd->cd_ndevs) {
/*
* Need to expand the array.
*/
int old = cd->cd_ndevs, new;
void **nsp;
if (old == 0)
new = MINALLOCSIZE / sizeof(void *);
else
new = old * 2;
while (new <= dev->dv_unit)
new *= 2;
cd->cd_ndevs = new;
nsp = malloc(new * sizeof(void *), M_DEVBUF, M_NOWAIT|M_ZERO);
if (nsp == 0)
panic("config_make_softc: %sing dev array",
old != 0 ? "expand" : "creat");
if (old != 0) {
bcopy(cd->cd_devs, nsp, old * sizeof(void *));
free(cd->cd_devs, M_DEVBUF);
}
cd->cd_devs = nsp;
}
if (cd->cd_devs[dev->dv_unit])
panic("config_make_softc: duplicate %s", dev->dv_xname);
dev->dv_ref = 1;
return (dev);
}
/*
* Detach a device. Optionally forced (e.g. because of hardware
* removal) and quiet. Returns zero if successful, non-zero
* (an error code) otherwise.
*
* Note that this code wants to be run from a process context, so
* that the detach can sleep to allow processes which have a device
* open to run and unwind their stacks.
*/
int
config_detach(struct device *dev, int flags)
{
struct cfdata *cf;
struct cfattach *ca;
struct cfdriver *cd;
int rv = 0, i;
#ifdef DIAGNOSTIC
struct device *d;
#endif
#if NHOTPLUG > 0
char devname[16];
#endif
#if NHOTPLUG > 0
strlcpy(devname, dev->dv_xname, sizeof(devname));
#endif
cf = dev->dv_cfdata;
#ifdef DIAGNOSTIC
if (cf->cf_fstate != FSTATE_FOUND && cf->cf_fstate != FSTATE_STAR)
panic("config_detach: bad device fstate");
#endif
ca = cf->cf_attach;
cd = cf->cf_driver;
/*
* Ensure the device is deactivated. If the device doesn't
* have an activation entry point, we allow DVF_ACTIVE to
* remain set. Otherwise, if DVF_ACTIVE is still set, the
* device is busy, and the detach fails.
*/
if (ca->ca_activate != NULL)
rv = config_deactivate(dev);
/*
* Try to detach the device. If that's not possible, then
* we either panic() (for the forced but failed case), or
* return an error.
*/
if (rv == 0) {
if (ca->ca_detach != NULL)
rv = (*ca->ca_detach)(dev, flags);
else
rv = EOPNOTSUPP;
}
if (rv != 0) {
if ((flags & DETACH_FORCE) == 0)
return (rv);
else
panic("config_detach: forced detach of %s failed (%d)",
dev->dv_xname, rv);
}
/*
* The device has now been successfully detached.
*/
#ifdef DIAGNOSTIC
/*
* Sanity: If you're successfully detached, you should have no
* children. (Note that because children must be attached
* after parents, we only need to search the latter part of
* the list.)
*/
i = 0;
for (d = TAILQ_NEXT(dev, dv_list); d != NULL;
d = TAILQ_NEXT(d, dv_list)) {
if (d->dv_parent == dev) {
printf("config_detach: %s attached at %s\n",
d->dv_xname, dev->dv_xname);
i = 1;
}
}
if (i != 0)
panic("config_detach: detached device (%s) has children",
dev->dv_xname);
#endif
/*
* Mark cfdata to show that the unit can be reused, if possible.
* Note that we can only re-use a starred unit number if the unit
* being detached had the last assigned unit number.
*/
for (cf = cfdata; cf->cf_driver; cf++) {
if (cf->cf_driver == cd) {
if (cf->cf_fstate == FSTATE_FOUND &&
cf->cf_unit == dev->dv_unit)
cf->cf_fstate = FSTATE_NOTFOUND;
if (cf->cf_fstate == FSTATE_STAR &&
cf->cf_unit == dev->dv_unit + 1)
cf->cf_unit--;
}
}
/*
* Unlink from device list.
*/
TAILQ_REMOVE(&alldevs, dev, dv_list);
device_unref(dev);
/*
* Remove from cfdriver's array, tell the world, and free softc.
*/
cd->cd_devs[dev->dv_unit] = NULL;
if ((flags & DETACH_QUIET) == 0)
printf("%s detached\n", dev->dv_xname);
device_unref(dev);
/*
* If the device now has no units in use, deallocate its softc array.
*/
for (i = 0; i < cd->cd_ndevs; i++)
if (cd->cd_devs[i] != NULL)
break;
if (i == cd->cd_ndevs) { /* nothing found; deallocate */
free(cd->cd_devs, M_DEVBUF);
cd->cd_devs = NULL;
cd->cd_ndevs = 0;
cf->cf_unit = 0;
}
#if NHOTPLUG > 0
if (!cold)
hotplug_device_detach(cd->cd_class, devname);
#endif
/*
* Return success.
*/
return (0);
}
int
config_activate(struct device *dev)
{
struct cfattach *ca = dev->dv_cfdata->cf_attach;
int rv = 0, oflags = dev->dv_flags;
if (ca->ca_activate == NULL)
return (EOPNOTSUPP);
if ((dev->dv_flags & DVF_ACTIVE) == 0) {
dev->dv_flags |= DVF_ACTIVE;
rv = (*ca->ca_activate)(dev, DVACT_ACTIVATE);
if (rv)
dev->dv_flags = oflags;
}
return (rv);
}
int
config_deactivate(struct device *dev)
{
struct cfattach *ca = dev->dv_cfdata->cf_attach;
int rv = 0, oflags = dev->dv_flags;
if (ca->ca_activate == NULL)
return (EOPNOTSUPP);
if (dev->dv_flags & DVF_ACTIVE) {
dev->dv_flags &= ~DVF_ACTIVE;
rv = (*ca->ca_activate)(dev, DVACT_DEACTIVATE);
if (rv)
dev->dv_flags = oflags;
}
return (rv);
}
/*
* Defer the configuration of the specified device until all
* of its parent's devices have been attached.
*/
void
config_defer(struct device *dev, void (*func)(struct device *))
{
struct deferred_config *dc;
if (dev->dv_parent == NULL)
panic("config_defer: can't defer config of a root device");
#ifdef DIAGNOSTIC
for (dc = TAILQ_FIRST(&deferred_config_queue); dc != NULL;
dc = TAILQ_NEXT(dc, dc_queue)) {
if (dc->dc_dev == dev)
panic("config_defer: deferred twice");
}
#endif
if ((dc = malloc(sizeof(*dc), M_DEVBUF, M_NOWAIT)) == NULL)
panic("config_defer: can't allocate defer structure");
dc->dc_dev = dev;
dc->dc_func = func;
TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue);
config_pending_incr();
}
/*
* Process the deferred configuration queue for a device.
*/
void
config_process_deferred_children(struct device *parent)
{
struct deferred_config *dc, *ndc;
for (dc = TAILQ_FIRST(&deferred_config_queue);
dc != NULL; dc = ndc) {
ndc = TAILQ_NEXT(dc, dc_queue);
if (dc->dc_dev->dv_parent == parent) {
TAILQ_REMOVE(&deferred_config_queue, dc, dc_queue);
(*dc->dc_func)(dc->dc_dev);
free(dc, M_DEVBUF);
config_pending_decr();
}
}
}
/*
* Manipulate the config_pending semaphore.
*/
void
config_pending_incr(void)
{
config_pending++;
}
void
config_pending_decr(void)
{
#ifdef DIAGNOSTIC
if (config_pending == 0)
panic("config_pending_decr: config_pending == 0");
#endif
config_pending--;
if (config_pending == 0)
wakeup((void *)&config_pending);
}
int
config_detach_children(struct device *parent, int flags)
{
struct device *dev, *next_dev;
int rv = 0;
/*
* The config_detach routine may sleep, meaning devices
* may be added to the queue. However, all devices will
* be added to the tail of the queue, the queue won't
* be re-organized, and the subtree of parent here should be locked
* for purposes of adding/removing children.
*
* Note that we can not afford trying to walk the device list
* once - our ``next'' device might be a child of the device
* we are about to detach, so it would disappear.
* Just play it safe and restart from the parent.
*/
for (dev = TAILQ_LAST(&alldevs, devicelist);
dev != NULL; dev = next_dev) {
if (dev->dv_parent == parent) {
if ((rv = config_detach(dev, flags)) != 0)
return (rv);
next_dev = TAILQ_LAST(&alldevs, devicelist);
} else {
next_dev = TAILQ_PREV(dev, devicelist, dv_list);
}
}
return (0);
}
int
config_suspend(struct device *dev, int act)
{
struct cfattach *ca = dev->dv_cfdata->cf_attach;
if (ca->ca_activate) {
#if 0
printf("activate: %s %d\n", dev->dv_xname, act);
#endif
return (*ca->ca_activate)(dev, act);
}
return (0);
}
/*
* Call the ca_activate for each of our children, letting each
* decide whether they wish to do the same for their children
* and more.
*/
int
config_activate_children(struct device *parent, int act)
{
struct device *d;
int rv = 0;
for (d = TAILQ_NEXT(parent, dv_list); d != NULL;
d = TAILQ_NEXT(d, dv_list)) {
if (d->dv_parent != parent)
continue;
switch (act) {
case DVACT_ACTIVATE:
rv = config_activate(d);
break;
case DVACT_SUSPEND:
case DVACT_RESUME:
case DVACT_QUIESCE:
rv = config_suspend(d, act);
break;
case DVACT_DEACTIVATE:
rv = config_deactivate(d);
break;
}
if (rv == 0)
continue;
/*
* Found a device that refuses the action.
* If we were being asked to suspend, we can
* try to resume all previous devices.
*/
#ifdef DIAGNOSTIC
printf("config_activate_children: device %s failed %d\n",
d->dv_xname, act);
#endif
if (act == DVACT_RESUME)
printf("failing resume cannot be handled\n");
if (act != DVACT_SUSPEND)
return (rv);
d = TAILQ_PREV(d, devicelist, dv_list);
for (; d != NULL && d != parent;
d = TAILQ_PREV(d, devicelist, dv_list)) {
if (d->dv_parent != parent)
continue;
printf("resume %s\n", d->dv_xname);
config_suspend(d, DVACT_RESUME);
}
return (rv);
}
return (rv);
}
/*
* Lookup a device in the cfdriver device array. Does not return a
* device if it is not active.
*
* Increments ref count on the device by one, reflecting the
* new reference created on the stack.
*
* Context: process only
*/
struct device *
device_lookup(struct cfdriver *cd, int unit)
{
struct device *dv = NULL;
if (unit >= 0 && unit < cd->cd_ndevs)
dv = (struct device *)(cd->cd_devs[unit]);
if (!dv)
return (NULL);
if (!(dv->dv_flags & DVF_ACTIVE))
dv = NULL;
if (dv != NULL)
device_ref(dv);
return (dv);
}
/*
* Increments the ref count on the device structure. The device
* structure is freed when the ref count hits 0.
*
* Context: process or interrupt
*/
void
device_ref(struct device *dv)
{
dv->dv_ref++;
}
/*
* Decrement the ref count on the device structure.
*
* free's the structure when the ref count hits zero.
*
* Context: process or interrupt
*/
void
device_unref(struct device *dv)
{
dv->dv_ref--;
if (dv->dv_ref == 0) {
free(dv, M_DEVBUF);
}
}
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