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[src/trunk]: src/sys/kern Revert 1.194 rev.
details: https://anonhg.NetBSD.org/src/rev/82c02448f573
branches: trunk
changeset: 750747:82c02448f573
user: rmind <rmind%NetBSD.org@localhost>
date: Tue Jan 12 22:11:13 2010 +0000
description:
Revert 1.194 rev.
diffstat:
sys/kern/subr_autoconf.c | 112 +++++++++++++++++++++++++++-------------------
1 files changed, 66 insertions(+), 46 deletions(-)
diffs (279 lines):
diff -r 1b7ec14fe18e -r 82c02448f573 sys/kern/subr_autoconf.c
--- a/sys/kern/subr_autoconf.c Tue Jan 12 21:48:26 2010 +0000
+++ b/sys/kern/subr_autoconf.c Tue Jan 12 22:11:13 2010 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: subr_autoconf.c,v 1.196 2010/01/10 13:42:34 martin Exp $ */
+/* $NetBSD: subr_autoconf.c,v 1.197 2010/01/12 22:11:13 rmind Exp $ */
/*
* Copyright (c) 1996, 2000 Christopher G. Demetriou
@@ -77,7 +77,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: subr_autoconf.c,v 1.196 2010/01/10 13:42:34 martin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: subr_autoconf.c,v 1.197 2010/01/12 22:11:13 rmind Exp $");
#ifdef _KERNEL_OPT
#include "opt_ddb.h"
@@ -171,7 +171,10 @@
static void config_devlink(device_t);
static void config_alldevs_unlock(int);
static int config_alldevs_lock(void);
-static void config_alldevs_unlock_gc(int);
+
+static void config_collect_garbage(struct devicelist *);
+static void config_dump_garbage(struct devicelist *);
+
static void pmflock_debug(device_t, const char *, int);
static device_t deviter_next1(deviter_t *);
@@ -205,7 +208,6 @@
/* list of all devices */
static struct devicelist alldevs = TAILQ_HEAD_INITIALIZER(alldevs);
-static struct devicelist devs_gclist = TAILQ_HEAD_INITIALIZER(devs_gclist);
static kmutex_t alldevs_mtx;
static volatile bool alldevs_garbage = false;
static volatile devgen_t alldevs_gen = 1;
@@ -368,9 +370,11 @@
int
config_cfdriver_detach(struct cfdriver *cd)
{
+ struct devicelist garbage = TAILQ_HEAD_INITIALIZER(garbage);
int i, rc = 0, s;
s = config_alldevs_lock();
+ config_collect_garbage(&garbage);
/* Make sure there are no active instances. */
for (i = 0; i < cd->cd_ndevs; i++) {
if (cd->cd_devs[i] != NULL) {
@@ -378,7 +382,8 @@
break;
}
}
- config_alldevs_unlock_gc(s);
+ config_alldevs_unlock(s);
+ config_dump_garbage(&garbage);
if (rc != 0)
return rc;
@@ -440,6 +445,7 @@
int
config_cfattach_detach(const char *driver, struct cfattach *ca)
{
+ struct devicelist garbage = TAILQ_HEAD_INITIALIZER(garbage);
struct cfdriver *cd;
device_t dev;
int i, rc = 0, s;
@@ -449,6 +455,7 @@
return ESRCH;
s = config_alldevs_lock();
+ config_collect_garbage(&garbage);
/* Make sure there are no active instances. */
for (i = 0; i < cd->cd_ndevs; i++) {
if ((dev = cd->cd_devs[i]) == NULL)
@@ -458,7 +465,8 @@
break;
}
}
- config_alldevs_unlock_gc(s);
+ config_alldevs_unlock(s);
+ config_dump_garbage(&garbage);
if (rc != 0)
return rc;
@@ -1024,9 +1032,7 @@
}
/*
- * config_devunlink: unlink the device and put into the garbage list.
- *
- * => caller must hold alldevs_mtx.
+ * Caller must hold alldevs_mtx.
*/
static void
config_devunlink(device_t dev, struct devicelist *garbage)
@@ -1075,12 +1081,14 @@
KASSERT(dev->dv_properties != NULL);
prop_object_release(dev->dv_properties);
- KASSERT(dev->dv_activity_handlers == NULL);
+ if (dev->dv_activity_handlers)
+ panic("%s with registered handlers", __func__);
if (dev->dv_locators) {
size_t amount = *--dev->dv_locators;
kmem_free(dev->dv_locators, amount);
}
+
config_devfree(dev);
}
@@ -1108,10 +1116,12 @@
static int
config_unit_alloc(device_t dev, cfdriver_t cd, cfdata_t cf)
{
+ struct devicelist garbage = TAILQ_HEAD_INITIALIZER(garbage);
int s, unit;
s = config_alldevs_lock();
for (;;) {
+ config_collect_garbage(&garbage);
unit = config_unit_nextfree(cd, cf);
if (unit == -1)
break;
@@ -1122,7 +1132,8 @@
}
config_makeroom(unit, cd);
}
- config_alldevs_unlock_gc(s);
+ config_alldevs_unlock(s);
+ config_dump_garbage(&garbage);
return unit;
}
@@ -1130,6 +1141,7 @@
static device_t
config_devalloc(const device_t parent, const cfdata_t cf, const int *locs)
{
+ struct devicelist garbage = TAILQ_HEAD_INITIALIZER(garbage);
cfdriver_t cd;
cfattach_t ca;
size_t lname, lunit;
@@ -1360,6 +1372,43 @@
}
/*
+ * Caller must hold alldevs_mtx.
+ */
+static void
+config_collect_garbage(struct devicelist *garbage)
+{
+ device_t dv;
+
+ KASSERT(!cpu_intr_p());
+ KASSERT(!cpu_softintr_p());
+ KASSERT(mutex_owned(&alldevs_mtx));
+
+ while (alldevs_nwrite == 0 && alldevs_nread == 0 && alldevs_garbage) {
+ TAILQ_FOREACH(dv, &alldevs, dv_list) {
+ if (dv->dv_del_gen != 0)
+ break;
+ }
+ if (dv == NULL) {
+ alldevs_garbage = false;
+ break;
+ }
+ config_devunlink(dv, garbage);
+ }
+ KASSERT(mutex_owned(&alldevs_mtx));
+}
+
+static void
+config_dump_garbage(struct devicelist *garbage)
+{
+ device_t dv;
+
+ while ((dv = TAILQ_FIRST(garbage)) != NULL) {
+ TAILQ_REMOVE(garbage, dv, dv_list);
+ config_devdelete(dv);
+ }
+}
+
+/*
* Detach a device. Optionally forced (e.g. because of hardware
* removal) and quiet. Returns zero if successful, non-zero
* (an error code) otherwise.
@@ -1371,6 +1420,7 @@
int
config_detach(device_t dev, int flags)
{
+ struct devicelist garbage = TAILQ_HEAD_INITIALIZER(garbage);
struct cftable *ct;
cfdata_t cf;
const struct cfattach *ca;
@@ -1485,7 +1535,9 @@
dev->dv_del_gen = alldevs_gen;
alldevs_garbage = true;
}
- config_alldevs_unlock_gc(s);
+ config_collect_garbage(&garbage);
+ config_alldevs_unlock(s);
+ config_dump_garbage(&garbage);
return rv;
}
@@ -1826,55 +1878,21 @@
static int
config_alldevs_lock(void)
{
- device_t dv;
int s;
s = splhigh();
mutex_enter(&alldevs_mtx);
-
- KASSERT(TAILQ_EMPTY(&devs_gclist));
- while (alldevs_nwrite == 0 && alldevs_nread == 0 && alldevs_garbage) {
- TAILQ_FOREACH(dv, &alldevs, dv_list)
- if (dv->dv_del_gen != 0)
- break;
- if (dv == NULL) {
- alldevs_garbage = false;
- break;
- }
- config_devunlink(dv, &devs_gclist);
- }
return s;
}
static void
config_alldevs_unlock(int s)
{
-
mutex_exit(&alldevs_mtx);
splx(s);
}
/*
- * config_alldevs_unlock_gc: unlock and free garbage collected entries.
- */
-static void
-config_alldevs_unlock_gc(int s)
-{
- struct devicelist gclist = TAILQ_HEAD_INITIALIZER(gclist);
- device_t dv;
-
- KASSERT(mutex_owned(&alldevs_mtx));
- TAILQ_CONCAT(&gclist, &devs_gclist, dv_list);
- KASSERT(TAILQ_EMPTY(&devs_gclist));
- config_alldevs_unlock(s);
-
- while ((dv = TAILQ_FIRST(&gclist)) != NULL) {
- TAILQ_REMOVE(&gclist, dv, dv_list);
- config_devdelete(dv);
- }
-}
-
-/*
* device_lookup:
*
* Look up a device instance for a given driver.
@@ -1882,6 +1900,7 @@
device_t
device_lookup(cfdriver_t cd, int unit)
{
+ struct devicelist garbage = TAILQ_HEAD_INITIALIZER(garbage);
device_t dv;
int s;
@@ -1892,6 +1911,7 @@
else if ((dv = cd->cd_devs[unit]) != NULL && dv->dv_del_gen != 0)
dv = NULL;
config_alldevs_unlock(s);
+ config_dump_garbage(&garbage);
return dv;
}
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