kern_conf.c revision 149147
1/*- 2 * Copyright (c) 1999-2002 Poul-Henning Kamp 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/kern/kern_conf.c 149147 2005-08-16 19:47:42Z phk $"); 29 30#include <sys/param.h> 31#include <sys/kernel.h> 32#include <sys/systm.h> 33#include <sys/bio.h> 34#include <sys/lock.h> 35#include <sys/mutex.h> 36#include <sys/sysctl.h> 37#include <sys/module.h> 38#include <sys/malloc.h> 39#include <sys/conf.h> 40#include <sys/vnode.h> 41#include <sys/queue.h> 42#include <sys/poll.h> 43#include <sys/ctype.h> 44#include <sys/tty.h> 45#include <sys/ucred.h> 46#include <machine/stdarg.h> 47 48#include <fs/devfs/devfs_int.h> 49 50static MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage"); 51 52static struct mtx devmtx; 53static void freedev(struct cdev *dev); 54static void destroy_devl(struct cdev *dev); 55static struct cdev *make_dev_credv(struct cdevsw *devsw, int minornr, 56 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, 57 va_list ap); 58 59void 60dev_lock(void) 61{ 62 if (!mtx_initialized(&devmtx)) 63 mtx_init(&devmtx, "cdev", NULL, MTX_DEF); 64 mtx_lock(&devmtx); 65} 66 67void 68dev_unlock(void) 69{ 70 71 mtx_unlock(&devmtx); 72} 73 74void 75dev_ref(struct cdev *dev) 76{ 77 78 mtx_assert(&devmtx, MA_NOTOWNED); 79 mtx_lock(&devmtx); 80 dev->si_refcount++; 81 mtx_unlock(&devmtx); 82} 83 84void 85dev_refl(struct cdev *dev) 86{ 87 88 mtx_assert(&devmtx, MA_OWNED); 89 dev->si_refcount++; 90} 91 92void 93dev_rel(struct cdev *dev) 94{ 95 int flag = 0; 96 97 mtx_assert(&devmtx, MA_NOTOWNED); 98 dev_lock(); 99 dev->si_refcount--; 100 KASSERT(dev->si_refcount >= 0, 101 ("dev_rel(%s) gave negative count", devtoname(dev))); 102 if (dev->si_usecount == 0 && 103 (dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED)) 104 if (dev->si_devsw == NULL && dev->si_refcount == 0) { 105 LIST_REMOVE(dev, si_list); 106 flag = 1; 107 } 108 dev_unlock(); 109 if (flag) 110 freedev(dev); 111} 112 113struct cdevsw * 114dev_refthread(struct cdev *dev) 115{ 116 struct cdevsw *csw; 117 118 mtx_assert(&devmtx, MA_NOTOWNED); 119 dev_lock(); 120 csw = dev->si_devsw; 121 if (csw != NULL) 122 dev->si_threadcount++; 123 dev_unlock(); 124 return (csw); 125} 126 127void 128dev_relthread(struct cdev *dev) 129{ 130 131 mtx_assert(&devmtx, MA_NOTOWNED); 132 dev_lock(); 133 dev->si_threadcount--; 134 dev_unlock(); 135} 136 137int 138nullop(void) 139{ 140 141 return (0); 142} 143 144int 145eopnotsupp(void) 146{ 147 148 return (EOPNOTSUPP); 149} 150 151static int 152enxio(void) 153{ 154 return (ENXIO); 155} 156 157static int 158enodev(void) 159{ 160 return (ENODEV); 161} 162 163/* Define a dead_cdevsw for use when devices leave unexpectedly. */ 164 165#define dead_open (d_open_t *)enxio 166#define dead_close (d_close_t *)enxio 167#define dead_read (d_read_t *)enxio 168#define dead_write (d_write_t *)enxio 169#define dead_ioctl (d_ioctl_t *)enxio 170#define dead_poll (d_poll_t *)enodev 171#define dead_mmap (d_mmap_t *)enodev 172 173static void 174dead_strategy(struct bio *bp) 175{ 176 177 biofinish(bp, NULL, ENXIO); 178} 179 180#define dead_dump (dumper_t *)enxio 181#define dead_kqfilter (d_kqfilter_t *)enxio 182 183static struct cdevsw dead_cdevsw = { 184 .d_version = D_VERSION, 185 .d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */ 186 .d_open = dead_open, 187 .d_close = dead_close, 188 .d_read = dead_read, 189 .d_write = dead_write, 190 .d_ioctl = dead_ioctl, 191 .d_poll = dead_poll, 192 .d_mmap = dead_mmap, 193 .d_strategy = dead_strategy, 194 .d_name = "dead", 195 .d_dump = dead_dump, 196 .d_kqfilter = dead_kqfilter 197}; 198 199/* Default methods if driver does not specify method */ 200 201#define null_open (d_open_t *)nullop 202#define null_close (d_close_t *)nullop 203#define no_read (d_read_t *)enodev 204#define no_write (d_write_t *)enodev 205#define no_ioctl (d_ioctl_t *)enodev 206#define no_mmap (d_mmap_t *)enodev 207#define no_kqfilter (d_kqfilter_t *)enodev 208 209static void 210no_strategy(struct bio *bp) 211{ 212 213 biofinish(bp, NULL, ENODEV); 214} 215 216static int 217no_poll(struct cdev *dev __unused, int events, struct thread *td __unused) 218{ 219 /* 220 * Return true for read/write. If the user asked for something 221 * special, return POLLNVAL, so that clients have a way of 222 * determining reliably whether or not the extended 223 * functionality is present without hard-coding knowledge 224 * of specific filesystem implementations. 225 * Stay in sync with vop_nopoll(). 226 */ 227 if (events & ~POLLSTANDARD) 228 return (POLLNVAL); 229 230 return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 231} 232 233#define no_dump (dumper_t *)enodev 234 235/* 236 * struct cdev * and u_dev_t primitives 237 */ 238 239int 240minor(struct cdev *x) 241{ 242 if (x == NULL) 243 return NODEV; 244 return(x->si_drv0 & MAXMINOR); 245} 246 247int 248dev2unit(struct cdev *x) 249{ 250 251 if (x == NULL) 252 return NODEV; 253 return (minor2unit(minor(x))); 254} 255 256u_int 257minor2unit(u_int _minor) 258{ 259 260 KASSERT((_minor & ~MAXMINOR) == 0, ("Illegal minor %x", _minor)); 261 return ((_minor & 0xff) | ((_minor >> 8) & 0xffff00)); 262} 263 264int 265unit2minor(int unit) 266{ 267 268 KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit)); 269 return ((unit & 0xff) | ((unit << 8) & ~0xffff)); 270} 271 272static struct cdev * 273allocdev(void) 274{ 275 struct cdev *si; 276 277 si = malloc(sizeof *si, M_DEVT, M_USE_RESERVE | M_ZERO | M_WAITOK); 278 si->si_name = si->__si_namebuf; 279 LIST_INIT(&si->si_children); 280 LIST_INIT(&si->si_alist); 281 return (si); 282} 283 284static struct cdev * 285newdev(struct cdevsw *csw, int y, struct cdev *si) 286{ 287 struct cdev *si2; 288 dev_t udev; 289 290 mtx_assert(&devmtx, MA_OWNED); 291 udev = y; 292 LIST_FOREACH(si2, &csw->d_devs, si_list) { 293 if (si2->si_drv0 == udev) { 294 freedev(si); 295 return (si2); 296 } 297 } 298 si->si_drv0 = udev; 299 LIST_INSERT_HEAD(&csw->d_devs, si, si_list); 300 return (si); 301} 302 303static void 304freedev(struct cdev *dev) 305{ 306 307 if (dev->si_cred != NULL) 308 crfree(dev->si_cred); 309 free(dev, M_DEVT); 310} 311 312int 313uminor(dev_t dev) 314{ 315 return (dev & MAXMINOR); 316} 317 318int 319umajor(dev_t dev) 320{ 321 return ((dev & ~MAXMINOR) >> 8); 322} 323 324static void 325fini_cdevsw(struct cdevsw *devsw) 326{ 327 328 devsw->d_flags &= ~D_INIT; 329} 330 331static void 332prep_cdevsw(struct cdevsw *devsw) 333{ 334 335 dev_lock(); 336 337 if (devsw->d_version != D_VERSION_01) { 338 printf( 339 "WARNING: Device driver \"%s\" has wrong version %s\n", 340 devsw->d_name, "and is disabled. Recompile KLD module."); 341 devsw->d_open = dead_open; 342 devsw->d_close = dead_close; 343 devsw->d_read = dead_read; 344 devsw->d_write = dead_write; 345 devsw->d_ioctl = dead_ioctl; 346 devsw->d_poll = dead_poll; 347 devsw->d_mmap = dead_mmap; 348 devsw->d_strategy = dead_strategy; 349 devsw->d_dump = dead_dump; 350 devsw->d_kqfilter = dead_kqfilter; 351 } 352 353 if (devsw->d_flags & D_TTY) { 354 if (devsw->d_ioctl == NULL) devsw->d_ioctl = ttyioctl; 355 if (devsw->d_read == NULL) devsw->d_read = ttyread; 356 if (devsw->d_write == NULL) devsw->d_write = ttywrite; 357 if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = ttykqfilter; 358 if (devsw->d_poll == NULL) devsw->d_poll = ttypoll; 359 } 360 361 if (devsw->d_open == NULL) devsw->d_open = null_open; 362 if (devsw->d_close == NULL) devsw->d_close = null_close; 363 if (devsw->d_read == NULL) devsw->d_read = no_read; 364 if (devsw->d_write == NULL) devsw->d_write = no_write; 365 if (devsw->d_ioctl == NULL) devsw->d_ioctl = no_ioctl; 366 if (devsw->d_poll == NULL) devsw->d_poll = no_poll; 367 if (devsw->d_mmap == NULL) devsw->d_mmap = no_mmap; 368 if (devsw->d_strategy == NULL) devsw->d_strategy = no_strategy; 369 if (devsw->d_dump == NULL) devsw->d_dump = no_dump; 370 if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = no_kqfilter; 371 372 LIST_INIT(&devsw->d_devs); 373 374 devsw->d_flags |= D_INIT; 375 376 dev_unlock(); 377} 378 379static struct cdev * 380make_dev_credv(struct cdevsw *devsw, int minornr, struct ucred *cr, uid_t uid, 381 gid_t gid, int mode, const char *fmt, va_list ap) 382{ 383 struct cdev *dev; 384 int i; 385 386 KASSERT((minornr & ~MAXMINOR) == 0, 387 ("Invalid minor (0x%x) in make_dev", minornr)); 388 389 if (!(devsw->d_flags & D_INIT)) 390 prep_cdevsw(devsw); 391 dev = allocdev(); 392 dev_lock(); 393 dev = newdev(devsw, minornr, dev); 394 if (dev->si_flags & SI_CHEAPCLONE && 395 dev->si_flags & SI_NAMED && 396 dev->si_devsw == devsw) { 397 /* 398 * This is allowed as it removes races and generally 399 * simplifies cloning devices. 400 * XXX: still ?? 401 */ 402 dev_unlock(); 403 return (dev); 404 } 405 KASSERT(!(dev->si_flags & SI_NAMED), 406 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)", 407 devsw->d_name, minor(dev), devtoname(dev))); 408 409 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 410 if (i > (sizeof dev->__si_namebuf - 1)) { 411 printf("WARNING: Device name truncated! (%s)\n", 412 dev->__si_namebuf); 413 } 414 415 dev->si_devsw = devsw; 416 dev->si_flags |= SI_NAMED; 417 if (cr != NULL) 418 dev->si_cred = crhold(cr); 419 else 420 dev->si_cred = NULL; 421 dev->si_uid = uid; 422 dev->si_gid = gid; 423 dev->si_mode = mode; 424 425 devfs_create(dev); 426 dev_unlock(); 427 return (dev); 428} 429 430struct cdev * 431make_dev(struct cdevsw *devsw, int minornr, uid_t uid, gid_t gid, int mode, 432 const char *fmt, ...) 433{ 434 struct cdev *dev; 435 va_list ap; 436 437 va_start(ap, fmt); 438 dev = make_dev_credv(devsw, minornr, NULL, uid, gid, mode, fmt, ap); 439 va_end(ap); 440 return (dev); 441} 442 443struct cdev * 444make_dev_cred(struct cdevsw *devsw, int minornr, struct ucred *cr, uid_t uid, 445 gid_t gid, int mode, const char *fmt, ...) 446{ 447 struct cdev *dev; 448 va_list ap; 449 450 va_start(ap, fmt); 451 dev = make_dev_credv(devsw, minornr, cr, uid, gid, mode, fmt, ap); 452 va_end(ap); 453 454 return (dev); 455} 456 457int 458dev_named(struct cdev *pdev, const char *name) 459{ 460 struct cdev *cdev; 461 462 if (strcmp(devtoname(pdev), name) == 0) 463 return (1); 464 LIST_FOREACH(cdev, &pdev->si_children, si_siblings) 465 if (strcmp(devtoname(cdev), name) == 0) 466 return (1); 467 return (0); 468} 469 470void 471dev_depends(struct cdev *pdev, struct cdev *cdev) 472{ 473 474 dev_lock(); 475 cdev->si_parent = pdev; 476 cdev->si_flags |= SI_CHILD; 477 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 478 dev_unlock(); 479} 480 481struct cdev * 482make_dev_alias(struct cdev *pdev, const char *fmt, ...) 483{ 484 struct cdev *dev; 485 va_list ap; 486 int i; 487 488 dev = allocdev(); 489 dev_lock(); 490 dev->si_flags |= SI_ALIAS; 491 dev->si_flags |= SI_NAMED; 492 va_start(ap, fmt); 493 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 494 if (i > (sizeof dev->__si_namebuf - 1)) { 495 printf("WARNING: Device name truncated! (%s)\n", 496 dev->__si_namebuf); 497 } 498 va_end(ap); 499 500 devfs_create(dev); 501 dev_unlock(); 502 dev_depends(pdev, dev); 503 return (dev); 504} 505 506static void 507destroy_devl(struct cdev *dev) 508{ 509 struct cdevsw *csw; 510 511 mtx_assert(&devmtx, MA_OWNED); 512 KASSERT(dev->si_flags & SI_NAMED, 513 ("WARNING: Driver mistake: destroy_dev on %d\n", minor(dev))); 514 515 devfs_destroy(dev); 516 517 /* Remove name marking */ 518 dev->si_flags &= ~SI_NAMED; 519 520 /* If we are a child, remove us from the parents list */ 521 if (dev->si_flags & SI_CHILD) { 522 LIST_REMOVE(dev, si_siblings); 523 dev->si_flags &= ~SI_CHILD; 524 } 525 526 /* Kill our children */ 527 while (!LIST_EMPTY(&dev->si_children)) 528 destroy_devl(LIST_FIRST(&dev->si_children)); 529 530 /* Remove from clone list */ 531 if (dev->si_flags & SI_CLONELIST) { 532 LIST_REMOVE(dev, si_clone); 533 dev->si_flags &= ~SI_CLONELIST; 534 } 535 536 csw = dev->si_devsw; 537 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */ 538 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) { 539 printf("Purging %lu threads from %s\n", 540 dev->si_threadcount, devtoname(dev)); 541 csw->d_purge(dev); 542 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10); 543 } 544 if (csw != NULL && csw->d_purge != NULL) 545 printf("All threads purged from %s\n", devtoname(dev)); 546 547 dev->si_drv1 = 0; 548 dev->si_drv2 = 0; 549 bzero(&dev->__si_u, sizeof(dev->__si_u)); 550 551 if (!(dev->si_flags & SI_ALIAS)) { 552 /* Remove from cdevsw list */ 553 LIST_REMOVE(dev, si_list); 554 555 /* If cdevsw has no struct cdev *'s, clean it */ 556 if (LIST_EMPTY(&csw->d_devs)) 557 fini_cdevsw(csw); 558 } 559 dev->si_flags &= ~SI_ALIAS; 560 561 if (dev->si_refcount > 0) { 562 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); 563 } else { 564 freedev(dev); 565 } 566} 567 568void 569destroy_dev(struct cdev *dev) 570{ 571 572 dev_lock(); 573 destroy_devl(dev); 574 dev_unlock(); 575} 576 577const char * 578devtoname(struct cdev *dev) 579{ 580 char *p; 581 struct cdevsw *csw; 582 int mynor; 583 584 if (dev->si_name[0] == '#' || dev->si_name[0] == '\0') { 585 p = dev->si_name; 586 csw = dev_refthread(dev); 587 if (csw != NULL) { 588 sprintf(p, "(%s)", csw->d_name); 589 dev_relthread(dev); 590 } 591 p += strlen(p); 592 mynor = minor(dev); 593 if (mynor < 0 || mynor > 255) 594 sprintf(p, "/%#x", (u_int)mynor); 595 else 596 sprintf(p, "/%d", mynor); 597 } 598 return (dev->si_name); 599} 600 601int 602dev_stdclone(char *name, char **namep, const char *stem, int *unit) 603{ 604 int u, i; 605 606 i = strlen(stem); 607 if (bcmp(stem, name, i) != 0) 608 return (0); 609 if (!isdigit(name[i])) 610 return (0); 611 u = 0; 612 if (name[i] == '0' && isdigit(name[i+1])) 613 return (0); 614 while (isdigit(name[i])) { 615 u *= 10; 616 u += name[i++] - '0'; 617 } 618 if (u > 0xffffff) 619 return (0); 620 *unit = u; 621 if (namep) 622 *namep = &name[i]; 623 if (name[i]) 624 return (2); 625 return (1); 626} 627 628/* 629 * Helper functions for cloning device drivers. 630 * 631 * The objective here is to make it unnecessary for the device drivers to 632 * use rman or similar to manage their unit number space. Due to the way 633 * we do "on-demand" devices, using rman or other "private" methods 634 * will be very tricky to lock down properly once we lock down this file. 635 * 636 * Instead we give the drivers these routines which puts the struct cdev *'s 637 * that are to be managed on their own list, and gives the driver the ability 638 * to ask for the first free unit number or a given specified unit number. 639 * 640 * In addition these routines support paired devices (pty, nmdm and similar) 641 * by respecting a number of "flag" bits in the minor number. 642 * 643 */ 644 645struct clonedevs { 646 LIST_HEAD(,cdev) head; 647}; 648 649void 650clone_setup(struct clonedevs **cdp) 651{ 652 653 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO); 654 LIST_INIT(&(*cdp)->head); 655} 656 657int 658clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, struct cdev **dp, u_int extra) 659{ 660 struct clonedevs *cd; 661 struct cdev *dev, *ndev, *dl, *de; 662 int unit, low, u; 663 664 KASSERT(*cdp != NULL, 665 ("clone_setup() not called in driver \"%s\"", csw->d_name)); 666 KASSERT(!(extra & CLONE_UNITMASK), 667 ("Illegal extra bits (0x%x) in clone_create", extra)); 668 KASSERT(*up <= CLONE_UNITMASK, 669 ("Too high unit (0x%x) in clone_create", *up)); 670 671 if (!(csw->d_flags & D_INIT)) 672 prep_cdevsw(csw); 673 674 /* 675 * Search the list for a lot of things in one go: 676 * A preexisting match is returned immediately. 677 * The lowest free unit number if we are passed -1, and the place 678 * in the list where we should insert that new element. 679 * The place to insert a specified unit number, if applicable 680 * the end of the list. 681 */ 682 unit = *up; 683 ndev = allocdev(); 684 dev_lock(); 685 low = extra; 686 de = dl = NULL; 687 cd = *cdp; 688 LIST_FOREACH(dev, &cd->head, si_clone) { 689 KASSERT(dev->si_flags & SI_CLONELIST, 690 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 691 u = dev2unit(dev); 692 if (u == (unit | extra)) { 693 *dp = dev; 694 freedev(ndev); 695 dev_unlock(); 696 return (0); 697 } 698 if (unit == -1 && u == low) { 699 low++; 700 de = dev; 701 continue; 702 } 703 if (u > (unit | extra)) { 704 dl = dev; 705 break; 706 } 707 } 708 if (unit == -1) 709 unit = low & CLONE_UNITMASK; 710 dev = newdev(csw, unit2minor(unit | extra), ndev); 711 if (dev->si_flags & SI_CLONELIST) { 712 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name); 713 printf("unit=%d\n", unit); 714 LIST_FOREACH(dev, &cd->head, si_clone) { 715 printf("\t%p %s\n", dev, dev->si_name); 716 } 717 panic("foo"); 718 } 719 KASSERT(!(dev->si_flags & SI_CLONELIST), 720 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name)); 721 if (dl != NULL) 722 LIST_INSERT_BEFORE(dl, dev, si_clone); 723 else if (de != NULL) 724 LIST_INSERT_AFTER(de, dev, si_clone); 725 else 726 LIST_INSERT_HEAD(&cd->head, dev, si_clone); 727 dev->si_flags |= SI_CLONELIST; 728 *up = unit; 729 dev_unlock(); 730 return (1); 731} 732 733/* 734 * Kill everything still on the list. The driver should already have 735 * disposed of any softc hung of the struct cdev *'s at this time. 736 */ 737void 738clone_cleanup(struct clonedevs **cdp) 739{ 740 struct cdev *dev, *tdev; 741 struct clonedevs *cd; 742 743 cd = *cdp; 744 if (cd == NULL) 745 return; 746 dev_lock(); 747 LIST_FOREACH_SAFE(dev, &cd->head, si_clone, tdev) { 748 KASSERT(dev->si_flags & SI_CLONELIST, 749 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 750 KASSERT(dev->si_flags & SI_NAMED, 751 ("Driver has goofed in cloning underways udev %x", dev->si_drv0)); 752 destroy_devl(dev); 753 } 754 dev_unlock(); 755 free(cd, M_DEVBUF); 756 *cdp = NULL; 757} 758