Module Name: src Committed By: rmind Date: Tue Jan 12 22:11:13 UTC 2010
Modified Files: src/sys/kern: subr_autoconf.c Log Message: Revert 1.194 rev. To generate a diff of this commit: cvs rdiff -u -r1.196 -r1.197 src/sys/kern/subr_autoconf.c Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.
Modified files: Index: src/sys/kern/subr_autoconf.c diff -u src/sys/kern/subr_autoconf.c:1.196 src/sys/kern/subr_autoconf.c:1.197 --- src/sys/kern/subr_autoconf.c:1.196 Sun Jan 10 13:42:34 2010 +++ src/sys/kern/subr_autoconf.c Tue Jan 12 22:11:13 2010 @@ -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; }