kern_conf.c revision 144279
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 144279 2005-03-29 08:13:17Z 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 <machine/stdarg.h> 46 47static MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage"); 48 49/* Built at compile time from sys/conf/majors */ 50extern unsigned char reserved_majors[256]; 51 52/* 53 * This is the number of hash-buckets. Experiments with 'real-life' 54 * dev_t's show that a prime halfway between two powers of two works 55 * best. 56 */ 57#define DEVT_HASH 83 58 59static LIST_HEAD(, cdev) dev_hash[DEVT_HASH]; 60 61static struct mtx devmtx; 62static void freedev(struct cdev *dev); 63static struct cdev *newdev(int x, int y, struct cdev *); 64static void destroy_devl(struct cdev *dev); 65 66void 67dev_lock(void) 68{ 69 if (!mtx_initialized(&devmtx)) 70 mtx_init(&devmtx, "cdev", NULL, MTX_DEF); 71 mtx_lock(&devmtx); 72} 73 74void 75dev_unlock(void) 76{ 77 78 mtx_unlock(&devmtx); 79} 80 81void 82dev_ref(struct cdev *dev) 83{ 84 85 mtx_assert(&devmtx, MA_OWNED); 86 dev->si_refcount++; 87} 88 89void 90dev_rel(struct cdev *dev) 91{ 92 int flag = 0; 93 94 mtx_assert(&devmtx, MA_NOTOWNED); 95 dev_lock(); 96 dev->si_refcount--; 97 KASSERT(dev->si_refcount >= 0, 98 ("dev_rel(%s) gave negative count", devtoname(dev))); 99 if (dev->si_usecount == 0 && 100 (dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED)) 101 if (dev->si_devsw == NULL && dev->si_refcount == 0) { 102 LIST_REMOVE(dev, si_list); 103 flag = 1; 104 } 105 dev_unlock(); 106 if (flag) 107 freedev(dev); 108} 109 110struct cdevsw * 111dev_refthread(struct cdev *dev) 112{ 113 struct cdevsw *csw; 114 115 mtx_assert(&devmtx, MA_NOTOWNED); 116 dev_lock(); 117 csw = dev->si_devsw; 118 if (csw != NULL) 119 dev->si_threadcount++; 120 dev_unlock(); 121 return (csw); 122} 123 124void 125dev_relthread(struct cdev *dev) 126{ 127 128 mtx_assert(&devmtx, MA_NOTOWNED); 129 dev_lock(); 130 dev->si_threadcount--; 131 dev_unlock(); 132} 133 134int 135nullop(void) 136{ 137 138 return (0); 139} 140 141int 142eopnotsupp(void) 143{ 144 145 return (EOPNOTSUPP); 146} 147 148static int 149enxio(void) 150{ 151 return (ENXIO); 152} 153 154static int 155enodev(void) 156{ 157 return (ENODEV); 158} 159 160/* Define a dead_cdevsw for use when devices leave unexpectedly. */ 161 162#define dead_open (d_open_t *)enxio 163#define dead_close (d_close_t *)enxio 164#define dead_read (d_read_t *)enxio 165#define dead_write (d_write_t *)enxio 166#define dead_ioctl (d_ioctl_t *)enxio 167#define dead_poll (d_poll_t *)enodev 168#define dead_mmap (d_mmap_t *)enodev 169 170static void 171dead_strategy(struct bio *bp) 172{ 173 174 biofinish(bp, NULL, ENXIO); 175} 176 177#define dead_dump (dumper_t *)enxio 178#define dead_kqfilter (d_kqfilter_t *)enxio 179 180static struct cdevsw dead_cdevsw = { 181 .d_version = D_VERSION, 182 .d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */ 183 .d_open = dead_open, 184 .d_close = dead_close, 185 .d_read = dead_read, 186 .d_write = dead_write, 187 .d_ioctl = dead_ioctl, 188 .d_poll = dead_poll, 189 .d_mmap = dead_mmap, 190 .d_strategy = dead_strategy, 191 .d_name = "dead", 192 .d_maj = 255, 193 .d_dump = dead_dump, 194 .d_kqfilter = dead_kqfilter 195}; 196 197/* Default methods if driver does not specify method */ 198 199#define null_open (d_open_t *)nullop 200#define null_close (d_close_t *)nullop 201#define no_read (d_read_t *)enodev 202#define no_write (d_write_t *)enodev 203#define no_ioctl (d_ioctl_t *)enodev 204#define no_mmap (d_mmap_t *)enodev 205#define no_kqfilter (d_kqfilter_t *)enodev 206 207static void 208no_strategy(struct bio *bp) 209{ 210 211 biofinish(bp, NULL, ENODEV); 212} 213 214static int 215no_poll(struct cdev *dev __unused, int events, struct thread *td __unused) 216{ 217 /* 218 * Return true for read/write. If the user asked for something 219 * special, return POLLNVAL, so that clients have a way of 220 * determining reliably whether or not the extended 221 * functionality is present without hard-coding knowledge 222 * of specific filesystem implementations. 223 * Stay in sync with vop_nopoll(). 224 */ 225 if (events & ~POLLSTANDARD) 226 return (POLLNVAL); 227 228 return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 229} 230 231#define no_dump (dumper_t *)enodev 232 233/* 234 * struct cdev * and u_dev_t primitives 235 */ 236 237static int 238major(struct cdev *x) 239{ 240 if (x == NULL) 241 return NODEV; 242 return((x->si_drv0 >> 8) & 0xff); 243} 244 245int 246minor(struct cdev *x) 247{ 248 if (x == NULL) 249 return NODEV; 250 return(x->si_drv0 & MAXMINOR); 251} 252 253int 254dev2unit(struct cdev *x) 255{ 256 257 if (x == NULL) 258 return NODEV; 259 return (minor2unit(minor(x))); 260} 261 262u_int 263minor2unit(u_int _minor) 264{ 265 266 KASSERT((_minor & ~MAXMINOR) == 0, ("Illegal minor %x", _minor)); 267 return ((_minor & 0xff) | ((_minor >> 8) & 0xffff00)); 268} 269 270int 271unit2minor(int unit) 272{ 273 274 KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit)); 275 return ((unit & 0xff) | ((unit << 8) & ~0xffff)); 276} 277 278static struct cdev * 279allocdev(void) 280{ 281 struct cdev *si; 282 283 si = malloc(sizeof *si, M_DEVT, M_USE_RESERVE | M_ZERO | M_WAITOK); 284 si->si_name = si->__si_namebuf; 285 LIST_INIT(&si->si_children); 286 LIST_INIT(&si->si_alist); 287 return (si); 288} 289 290static struct cdev * 291newdev(int x, int y, struct cdev *si) 292{ 293 struct cdev *si2; 294 dev_t udev; 295 int hash; 296 297 mtx_assert(&devmtx, MA_OWNED); 298 if (x == umajor(NODEV) && y == uminor(NODEV)) 299 panic("newdev of NODEV"); 300 udev = (x << 8) | y; 301 hash = udev % DEVT_HASH; 302 LIST_FOREACH(si2, &dev_hash[hash], si_hash) { 303 if (si2->si_drv0 == udev) { 304 freedev(si); 305 return (si2); 306 } 307 } 308 si->si_drv0 = udev; 309 LIST_INSERT_HEAD(&dev_hash[hash], si, si_hash); 310 return (si); 311} 312 313static void 314freedev(struct cdev *dev) 315{ 316 317 free(dev, M_DEVT); 318} 319 320int 321uminor(dev_t dev) 322{ 323 return (dev & MAXMINOR); 324} 325 326int 327umajor(dev_t dev) 328{ 329 return ((dev & ~MAXMINOR) >> 8); 330} 331 332static void 333find_major(struct cdevsw *devsw) 334{ 335 int i; 336 337 if (devsw->d_maj != 0) { 338 printf("NOTICE: Ignoring d_maj hint from driver \"%s\", %s", 339 devsw->d_name, "driver should be updated/fixed\n"); 340 devsw->d_maj = 0; 341 } 342 for (i = NUMCDEVSW - 1; i > 0; i--) 343 if (reserved_majors[i] != i) 344 break; 345 KASSERT(i > 0, ("Out of major numbers (%s)", devsw->d_name)); 346 devsw->d_maj = i; 347 reserved_majors[i] = i; 348 devsw->d_flags |= D_ALLOCMAJ; 349} 350 351static void 352fini_cdevsw(struct cdevsw *devsw) 353{ 354 if (devsw->d_flags & D_ALLOCMAJ) { 355 reserved_majors[devsw->d_maj] = 0; 356 devsw->d_maj = 0; 357 devsw->d_flags &= ~D_ALLOCMAJ; 358 } 359 devsw->d_flags &= ~D_INIT; 360} 361 362static void 363prep_cdevsw(struct cdevsw *devsw) 364{ 365 366 dev_lock(); 367 368 if (devsw->d_version != D_VERSION_01) { 369 printf( 370 "WARNING: Device driver \"%s\" has wrong version %s\n", 371 devsw->d_name, "and is disabled. Recompile KLD module."); 372 devsw->d_open = dead_open; 373 devsw->d_close = dead_close; 374 devsw->d_read = dead_read; 375 devsw->d_write = dead_write; 376 devsw->d_ioctl = dead_ioctl; 377 devsw->d_poll = dead_poll; 378 devsw->d_mmap = dead_mmap; 379 devsw->d_strategy = dead_strategy; 380 devsw->d_dump = dead_dump; 381 devsw->d_kqfilter = dead_kqfilter; 382 } 383 384 if (devsw->d_flags & D_TTY) { 385 if (devsw->d_ioctl == NULL) devsw->d_ioctl = ttyioctl; 386 if (devsw->d_read == NULL) devsw->d_read = ttyread; 387 if (devsw->d_write == NULL) devsw->d_write = ttywrite; 388 if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = ttykqfilter; 389 if (devsw->d_poll == NULL) devsw->d_poll = ttypoll; 390 } 391 392 if (devsw->d_open == NULL) devsw->d_open = null_open; 393 if (devsw->d_close == NULL) devsw->d_close = null_close; 394 if (devsw->d_read == NULL) devsw->d_read = no_read; 395 if (devsw->d_write == NULL) devsw->d_write = no_write; 396 if (devsw->d_ioctl == NULL) devsw->d_ioctl = no_ioctl; 397 if (devsw->d_poll == NULL) devsw->d_poll = no_poll; 398 if (devsw->d_mmap == NULL) devsw->d_mmap = no_mmap; 399 if (devsw->d_strategy == NULL) devsw->d_strategy = no_strategy; 400 if (devsw->d_dump == NULL) devsw->d_dump = no_dump; 401 if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = no_kqfilter; 402 403 LIST_INIT(&devsw->d_devs); 404 405 devsw->d_flags |= D_INIT; 406 407 if (!(devsw->d_flags & D_ALLOCMAJ)) 408 find_major(devsw); 409 dev_unlock(); 410} 411 412struct cdev * 413make_dev(struct cdevsw *devsw, int minornr, uid_t uid, gid_t gid, int perms, const char *fmt, ...) 414{ 415 struct cdev *dev; 416 va_list ap; 417 int i; 418 419 KASSERT((minornr & ~MAXMINOR) == 0, 420 ("Invalid minor (0x%x) in make_dev", minornr)); 421 422 if (!(devsw->d_flags & D_INIT)) { 423 prep_cdevsw(devsw); 424 if (devsw->d_uid == 0) 425 devsw->d_uid = uid; 426 if (devsw->d_gid == 0) 427 devsw->d_gid = gid; 428 if (devsw->d_mode == 0) 429 devsw->d_mode = perms; 430 } 431 dev = allocdev(); 432 dev_lock(); 433 dev = newdev(devsw->d_maj, minornr, dev); 434 if (dev->si_flags & SI_CHEAPCLONE && 435 dev->si_flags & SI_NAMED && 436 dev->si_devsw == devsw) { 437 /* 438 * This is allowed as it removes races and generally 439 * simplifies cloning devices. 440 * XXX: still ?? 441 */ 442 dev_unlock(); 443 return (dev); 444 } 445 KASSERT(!(dev->si_flags & SI_NAMED), 446 ("make_dev() by driver %s on pre-existing device (maj=%d, min=%x, name=%s)", 447 devsw->d_name, major(dev), minor(dev), devtoname(dev))); 448 449 va_start(ap, fmt); 450 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 451 if (i > (sizeof dev->__si_namebuf - 1)) { 452 printf("WARNING: Device name truncated! (%s)\n", 453 dev->__si_namebuf); 454 } 455 va_end(ap); 456 457 dev->si_devsw = devsw; 458 dev->si_flags |= SI_NAMED; 459 460 LIST_INSERT_HEAD(&devsw->d_devs, dev, si_list); 461 devfs_create(dev); 462 dev_unlock(); 463 return (dev); 464} 465 466int 467dev_named(struct cdev *pdev, const char *name) 468{ 469 struct cdev *cdev; 470 471 if (strcmp(devtoname(pdev), name) == 0) 472 return (1); 473 LIST_FOREACH(cdev, &pdev->si_children, si_siblings) 474 if (strcmp(devtoname(cdev), name) == 0) 475 return (1); 476 return (0); 477} 478 479void 480dev_depends(struct cdev *pdev, struct cdev *cdev) 481{ 482 483 dev_lock(); 484 cdev->si_parent = pdev; 485 cdev->si_flags |= SI_CHILD; 486 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 487 dev_unlock(); 488} 489 490struct cdev * 491make_dev_alias(struct cdev *pdev, const char *fmt, ...) 492{ 493 struct cdev *dev; 494 va_list ap; 495 int i; 496 497 dev = allocdev(); 498 dev_lock(); 499 dev->si_flags |= SI_ALIAS; 500 dev->si_flags |= SI_NAMED; 501 va_start(ap, fmt); 502 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 503 if (i > (sizeof dev->__si_namebuf - 1)) { 504 printf("WARNING: Device name truncated! (%s)\n", 505 dev->__si_namebuf); 506 } 507 va_end(ap); 508 509 devfs_create(dev); 510 dev_unlock(); 511 dev_depends(pdev, dev); 512 return (dev); 513} 514 515static void 516destroy_devl(struct cdev *dev) 517{ 518 struct cdevsw *csw; 519 520 mtx_assert(&devmtx, MA_OWNED); 521 KASSERT(dev->si_flags & SI_NAMED, 522 ("WARNING: Driver mistake: destroy_dev on %d/%d\n", 523 major(dev), minor(dev))); 524 525 devfs_destroy(dev); 526 527 /* Remove name marking */ 528 dev->si_flags &= ~SI_NAMED; 529 530 /* If we are a child, remove us from the parents list */ 531 if (dev->si_flags & SI_CHILD) { 532 LIST_REMOVE(dev, si_siblings); 533 dev->si_flags &= ~SI_CHILD; 534 } 535 536 /* Kill our children */ 537 while (!LIST_EMPTY(&dev->si_children)) 538 destroy_devl(LIST_FIRST(&dev->si_children)); 539 540 /* Remove from clone list */ 541 if (dev->si_flags & SI_CLONELIST) { 542 LIST_REMOVE(dev, si_clone); 543 dev->si_flags &= ~SI_CLONELIST; 544 } 545 546 csw = dev->si_devsw; 547 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */ 548 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) { 549 printf("Purging %lu threads from %s\n", 550 dev->si_threadcount, devtoname(dev)); 551 csw->d_purge(dev); 552 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10); 553 } 554 if (csw != NULL && csw->d_purge != NULL) 555 printf("All threads purged from %s\n", devtoname(dev)); 556 557 dev->si_drv1 = 0; 558 dev->si_drv2 = 0; 559 bzero(&dev->__si_u, sizeof(dev->__si_u)); 560 561 if (!(dev->si_flags & SI_ALIAS)) { 562 /* Remove from cdevsw list */ 563 LIST_REMOVE(dev, si_list); 564 565 /* If cdevsw has no struct cdev *'s, clean it */ 566 if (LIST_EMPTY(&csw->d_devs)) 567 fini_cdevsw(csw); 568 569 LIST_REMOVE(dev, si_hash); 570 } 571 dev->si_flags &= ~SI_ALIAS; 572 573 if (dev->si_refcount > 0) { 574 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); 575 } else { 576 freedev(dev); 577 } 578} 579 580void 581destroy_dev(struct cdev *dev) 582{ 583 584 dev_lock(); 585 destroy_devl(dev); 586 dev_unlock(); 587} 588 589const char * 590devtoname(struct cdev *dev) 591{ 592 char *p; 593 struct cdevsw *csw; 594 int mynor; 595 596 if (dev->si_name[0] == '#' || dev->si_name[0] == '\0') { 597 p = dev->si_name; 598 sprintf(p, "#%d", major(dev)); 599 p += strlen(p); 600 csw = dev_refthread(dev); 601 if (csw != NULL) { 602 sprintf(p, "(%s)", csw->d_name); 603 dev_relthread(dev); 604 } 605 p += strlen(p); 606 mynor = minor(dev); 607 if (mynor < 0 || mynor > 255) 608 sprintf(p, "/%#x", (u_int)mynor); 609 else 610 sprintf(p, "/%d", mynor); 611 } 612 return (dev->si_name); 613} 614 615int 616dev_stdclone(char *name, char **namep, const char *stem, int *unit) 617{ 618 int u, i; 619 620 i = strlen(stem); 621 if (bcmp(stem, name, i) != 0) 622 return (0); 623 if (!isdigit(name[i])) 624 return (0); 625 u = 0; 626 if (name[i] == '0' && isdigit(name[i+1])) 627 return (0); 628 while (isdigit(name[i])) { 629 u *= 10; 630 u += name[i++] - '0'; 631 } 632 if (u > 0xffffff) 633 return (0); 634 *unit = u; 635 if (namep) 636 *namep = &name[i]; 637 if (name[i]) 638 return (2); 639 return (1); 640} 641 642/* 643 * Helper functions for cloning device drivers. 644 * 645 * The objective here is to make it unnecessary for the device drivers to 646 * use rman or similar to manage their unit number space. Due to the way 647 * we do "on-demand" devices, using rman or other "private" methods 648 * will be very tricky to lock down properly once we lock down this file. 649 * 650 * Instead we give the drivers these routines which puts the struct cdev *'s 651 * that are to be managed on their own list, and gives the driver the ability 652 * to ask for the first free unit number or a given specified unit number. 653 * 654 * In addition these routines support paired devices (pty, nmdm and similar) 655 * by respecting a number of "flag" bits in the minor number. 656 * 657 */ 658 659struct clonedevs { 660 LIST_HEAD(,cdev) head; 661}; 662 663void 664clone_setup(struct clonedevs **cdp) 665{ 666 667 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO); 668 LIST_INIT(&(*cdp)->head); 669} 670 671int 672clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, struct cdev **dp, u_int extra) 673{ 674 struct clonedevs *cd; 675 struct cdev *dev, *ndev, *dl, *de; 676 int unit, low, u; 677 678 KASSERT(*cdp != NULL, 679 ("clone_setup() not called in driver \"%s\"", csw->d_name)); 680 KASSERT(!(extra & CLONE_UNITMASK), 681 ("Illegal extra bits (0x%x) in clone_create", extra)); 682 KASSERT(*up <= CLONE_UNITMASK, 683 ("Too high unit (0x%x) in clone_create", *up)); 684 685 if (!(csw->d_flags & D_INIT)) 686 prep_cdevsw(csw); 687 688 /* 689 * Search the list for a lot of things in one go: 690 * A preexisting match is returned immediately. 691 * The lowest free unit number if we are passed -1, and the place 692 * in the list where we should insert that new element. 693 * The place to insert a specified unit number, if applicable 694 * the end of the list. 695 */ 696 unit = *up; 697 ndev = allocdev(); 698 dev_lock(); 699 low = extra; 700 de = dl = NULL; 701 cd = *cdp; 702 LIST_FOREACH(dev, &cd->head, si_clone) { 703 KASSERT(dev->si_flags & SI_CLONELIST, 704 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 705 u = dev2unit(dev); 706 if (u == (unit | extra)) { 707 *dp = dev; 708 freedev(ndev); 709 dev_unlock(); 710 return (0); 711 } 712 if (unit == -1 && u == low) { 713 low++; 714 de = dev; 715 continue; 716 } 717 if (u > (unit | extra)) { 718 dl = dev; 719 break; 720 } 721 } 722 if (unit == -1) 723 unit = low & CLONE_UNITMASK; 724 dev = newdev(csw->d_maj, unit2minor(unit | extra), ndev); 725 if (dev->si_flags & SI_CLONELIST) { 726 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name); 727 printf("unit=%d\n", unit); 728 LIST_FOREACH(dev, &cd->head, si_clone) { 729 printf("\t%p %s\n", dev, dev->si_name); 730 } 731 panic("foo"); 732 } 733 KASSERT(!(dev->si_flags & SI_CLONELIST), 734 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name)); 735 if (dl != NULL) 736 LIST_INSERT_BEFORE(dl, dev, si_clone); 737 else if (de != NULL) 738 LIST_INSERT_AFTER(de, dev, si_clone); 739 else 740 LIST_INSERT_HEAD(&cd->head, dev, si_clone); 741 dev->si_flags |= SI_CLONELIST; 742 *up = unit; 743 dev_unlock(); 744 return (1); 745} 746 747/* 748 * Kill everything still on the list. The driver should already have 749 * disposed of any softc hung of the struct cdev *'s at this time. 750 */ 751void 752clone_cleanup(struct clonedevs **cdp) 753{ 754 struct cdev *dev, *tdev; 755 struct clonedevs *cd; 756 757 cd = *cdp; 758 if (cd == NULL) 759 return; 760 dev_lock(); 761 LIST_FOREACH_SAFE(dev, &cd->head, si_clone, tdev) { 762 KASSERT(dev->si_flags & SI_CLONELIST, 763 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 764 KASSERT(dev->si_flags & SI_NAMED, 765 ("Driver has goofed in cloning underways udev %x", dev->si_drv0)); 766 destroy_devl(dev); 767 } 768 dev_unlock(); 769 free(cd, M_DEVBUF); 770 *cdp = NULL; 771} 772