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subr_bus.c (138533) subr_bus.c (139507)
1/*-
2 * Copyright (c) 1997,1998,2003 Doug Rabson
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

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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>
1/*-
2 * Copyright (c) 1997,1998,2003 Doug Rabson
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

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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/subr_bus.c 138533 2004-12-08 02:39:56Z njl $");
28__FBSDID("$FreeBSD: head/sys/kern/subr_bus.c 139507 2004-12-31 20:47:51Z imp $");
29
30#include "opt_bus.h"
31
32#define __RMAN_RESOURCE_VISIBLE
33#include <sys/param.h>
34#include <sys/conf.h>
35#include <sys/filio.h>
36#include <sys/lock.h>

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943 if (driver->refs == 0)
944 kobj_class_free((kobj_class_t) driver);
945
946 bus_data_generation_update();
947 return (0);
948}
949
950/**
29
30#include "opt_bus.h"
31
32#define __RMAN_RESOURCE_VISIBLE
33#include <sys/param.h>
34#include <sys/conf.h>
35#include <sys/filio.h>
36#include <sys/lock.h>

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943 if (driver->refs == 0)
944 kobj_class_free((kobj_class_t) driver);
945
946 bus_data_generation_update();
947 return (0);
948}
949
950/**
951 * @brief Quiesces a set of device drivers from a device class
952 *
953 * Quiesce a device driver from a devclass. This is normally called
954 * automatically by DRIVER_MODULE().
955 *
956 * If the driver is currently attached to any devices,
957 * devclass_quiesece_driver() will first attempt to quiesce each
958 * device.
959 *
960 * @param dc the devclass to edit
961 * @param driver the driver to unregister
962 */
963int
964devclass_quiesce_driver(devclass_t busclass, driver_t *driver)
965{
966 devclass_t dc = devclass_find(driver->name);
967 driverlink_t dl;
968 device_t dev;
969 int i;
970 int error;
971
972 PDEBUG(("%s from devclass %s", driver->name, DEVCLANAME(busclass)));
973
974 if (!dc)
975 return (0);
976
977 /*
978 * Find the link structure in the bus' list of drivers.
979 */
980 TAILQ_FOREACH(dl, &busclass->drivers, link) {
981 if (dl->driver == driver)
982 break;
983 }
984
985 if (!dl) {
986 PDEBUG(("%s not found in %s list", driver->name,
987 busclass->name));
988 return (ENOENT);
989 }
990
991 /*
992 * Quiesce all devices. We iterate through all the devices in
993 * the devclass of the driver and quiesce any which are using
994 * the driver and which have a parent in the devclass which we
995 * are quiescing.
996 *
997 * Note that since a driver can be in multiple devclasses, we
998 * should not quiesce devices which are not children of
999 * devices in the affected devclass.
1000 */
1001 for (i = 0; i < dc->maxunit; i++) {
1002 if (dc->devices[i]) {
1003 dev = dc->devices[i];
1004 if (dev->driver == driver && dev->parent &&
1005 dev->parent->devclass == busclass) {
1006 if ((error = device_quiesce(dev)) != 0)
1007 return (error);
1008 }
1009 }
1010 }
1011
1012 return (0);
1013}
1014
1015/**
951 * @internal
952 */
953static driverlink_t
954devclass_find_driver_internal(devclass_t dc, const char *classname)
955{
956 driverlink_t dl;
957
958 PDEBUG(("%s in devclass %s", classname, DEVCLANAME(dc)));

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2309 device_set_driver(dev, NULL);
2310 device_set_desc(dev, NULL);
2311 device_sysctl_fini(dev);
2312
2313 return (0);
2314}
2315
2316/**
1016 * @internal
1017 */
1018static driverlink_t
1019devclass_find_driver_internal(devclass_t dc, const char *classname)
1020{
1021 driverlink_t dl;
1022
1023 PDEBUG(("%s in devclass %s", classname, DEVCLANAME(dc)));

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2374 device_set_driver(dev, NULL);
2375 device_set_desc(dev, NULL);
2376 device_sysctl_fini(dev);
2377
2378 return (0);
2379}
2380
2381/**
2382 * @brief Tells a driver to quiesce itself.
2383 *
2384 * This function is a wrapper around the DEVICE_QUIESCE() driver
2385 * method. If the call to DEVICE_QUIESCE() succeeds.
2386 *
2387 * @param dev the device to quiesce
2388 *
2389 * @retval 0 success
2390 * @retval ENXIO no driver was found
2391 * @retval ENOMEM memory allocation failure
2392 * @retval non-zero some other unix error code
2393 */
2394int
2395device_quiesce(device_t dev)
2396{
2397
2398 PDEBUG(("%s", DEVICENAME(dev)));
2399 if (dev->state == DS_BUSY)
2400 return (EBUSY);
2401 if (dev->state != DS_ATTACHED)
2402 return (0);
2403
2404 return (DEVICE_QUIESCE(dev));
2405}
2406
2407/**
2317 * @brief Notify a device of system shutdown
2318 *
2319 * This function calls the DEVICE_SHUTDOWN() driver method if the
2320 * device currently has an attached driver.
2321 *
2322 * @returns the value returned by DEVICE_SHUTDOWN()
2323 */
2324int

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3559 DRIVERNAME(dmd->dmd_driver),
3560 dmd->dmd_busname));
3561 error = devclass_delete_driver(bus_devclass,
3562 dmd->dmd_driver);
3563
3564 if (!error && dmd->dmd_chainevh)
3565 error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg);
3566 break;
2408 * @brief Notify a device of system shutdown
2409 *
2410 * This function calls the DEVICE_SHUTDOWN() driver method if the
2411 * device currently has an attached driver.
2412 *
2413 * @returns the value returned by DEVICE_SHUTDOWN()
2414 */
2415int

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3650 DRIVERNAME(dmd->dmd_driver),
3651 dmd->dmd_busname));
3652 error = devclass_delete_driver(bus_devclass,
3653 dmd->dmd_driver);
3654
3655 if (!error && dmd->dmd_chainevh)
3656 error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg);
3657 break;
3658 case MOD_QUIESCE:
3659 PDEBUG(("Quiesce module: driver %s from bus %s",
3660 DRIVERNAME(dmd->dmd_driver),
3661 dmd->dmd_busname));
3662 error = devclass_quiesce_driver(bus_devclass,
3663 dmd->dmd_driver);
3664
3665 if (!error && dmd->dmd_chainevh)
3666 error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg);
3667 break;
3567 default:
3568 error = EOPNOTSUPP;
3569 break;
3570 }
3571
3572 return (error);
3573}
3574

--- 344 unchanged lines hidden --- 		3668 default:
3669 error = EOPNOTSUPP;
3670 break;
3671 }
3672
3673 return (error);
3674}
3675

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