C++ device_delete_child函数代码示例

int
ata_identify(device_t dev)
{
    struct ata_channel *ch = device_get_softc(dev);
    struct ata_device *master = NULL, *slave = NULL;
    device_t master_child = NULL, slave_child = NULL;
    int master_unit = -1, slave_unit = -1;

    if (ch->devices & (ATA_ATA_MASTER | ATA_ATAPI_MASTER)) {
	if (!(master = kmalloc(sizeof(struct ata_device),
			      M_ATA, M_INTWAIT | M_ZERO))) {
	    device_printf(dev, "out of memory\n");
	    return ENOMEM;
	}
	master->unit = ATA_MASTER;
    }
    if (ch->devices & (ATA_ATA_SLAVE | ATA_ATAPI_SLAVE)) {
	if (!(slave = kmalloc(sizeof(struct ata_device),
			     M_ATA, M_INTWAIT | M_ZERO))) {
	    kfree(master, M_ATA);
	    device_printf(dev, "out of memory\n");
	    return ENOMEM;
	}
	slave->unit = ATA_SLAVE;
    }

#ifdef ATA_STATIC_ID
    if (ch->devices & ATA_ATA_MASTER)
	master_unit = (device_get_unit(dev) << 1);
#endif
    if (master && !(master_child = ata_add_child(dev, master, master_unit))) {
	kfree(master, M_ATA);
	master = NULL;
    }
#ifdef ATA_STATIC_ID
    if (ch->devices & ATA_ATA_SLAVE)
	slave_unit = (device_get_unit(dev) << 1) + 1;
#endif
    if (slave && !(slave_child = ata_add_child(dev, slave, slave_unit))) {
	kfree(slave, M_ATA);
	slave = NULL;
    }

    if (slave && ata_getparam(slave, 1)) {
	device_delete_child(dev, slave_child);
	kfree(slave, M_ATA);
    }
    if (master && ata_getparam(master, 1)) {
	device_delete_child(dev, master_child);
	kfree(master, M_ATA);
    }

    bus_generic_probe(dev);
    bus_generic_attach(dev);
    return 0;
}

static int
sbc_detach(device_t dev)
{
	struct sbc_softc *scp = device_get_softc(dev);

	sbc_lock(scp);
	device_delete_child(dev, scp->child_midi2);
	device_delete_child(dev, scp->child_midi1);
	device_delete_child(dev, scp->child_pcm);
	release_resource(scp);
	sbc_lockdestroy(scp);
	return bus_generic_detach(dev);
}

static void
card_detect_task(void *arg, int pending)
{
	struct fsl_sdhc_softc *sc = (struct fsl_sdhc_softc *)arg;
	int err;
	int insert;

	insert = read4(sc, SDHC_PRSSTAT) & PRSSTAT_CINS;

	mtx_lock(&sc->mtx);

	if (insert) {
		if (sc->child != NULL) {
			mtx_unlock(&sc->mtx);
			return;
		}

		sc->child = device_add_child(sc->self, "mmc", -1);
		if (sc->child == NULL) {
			device_printf(sc->self, "Couldn't add MMC bus!\n");
			mtx_unlock(&sc->mtx);
			return;
		}

		/* Initialize MMC bus host structure. */
		init_mmc_host_struct(sc);
		device_set_ivars(sc->child, &sc->mmc_host);

	} else {
		if (sc->child == NULL) {
			mtx_unlock(&sc->mtx);
			return;
		}
	}

	mtx_unlock(&sc->mtx);

	if (insert) {
		if ((err = device_probe_and_attach(sc->child)) != 0) {
			device_printf(sc->self, "MMC bus failed on probe "
			    "and attach! error %d\n", err);
			device_delete_child(sc->self, sc->child);
			sc->child = NULL;
		}
	} else {
		if (device_delete_child(sc->self, sc->child) != 0)
			device_printf(sc->self, "Could not delete MMC bus!\n");
		sc->child = NULL;
	}
}

int
ata_detach(device_t dev)
{
    struct ata_channel *ch = device_get_softc(dev);
    device_t *children;
    int nchildren, i;

    /* check that we have a valid channel to detach */
    if (!ch->r_irq)
	return ENXIO;

    /* grap the channel lock so no new requests gets launched */
    mtx_lock(&ch->state_mtx);
    ch->state |= ATA_STALL_QUEUE;
    mtx_unlock(&ch->state_mtx);

    /* detach & delete all children */
    if (!device_get_children(dev, &children, &nchildren)) {
	for (i = 0; i < nchildren; i++)
	    if (children[i])
		device_delete_child(dev, children[i]);
	free(children, M_TEMP);
    } 

    /* release resources */
    bus_teardown_intr(dev, ch->r_irq, ch->ih);
    bus_release_resource(dev, SYS_RES_IRQ, ATA_IRQ_RID, ch->r_irq);
    ch->r_irq = NULL;
    mtx_destroy(&ch->state_mtx);
    mtx_destroy(&ch->queue_mtx);
    return 0;
}

static int
vtpci_detach(device_t dev)
{
	struct vtpci_softc *sc;
	device_t child;
	int error;

	sc = device_get_softc(dev);

	if ((child = sc->vtpci_child_dev) != NULL) {
		error = device_delete_child(dev, child);
		if (error)
			return (error);
		sc->vtpci_child_dev = NULL;
	}

	vtpci_reset(sc);

	if (sc->vtpci_msix_res != NULL) {
		bus_release_resource(dev, SYS_RES_MEMORY, PCIR_BAR(1),
		    sc->vtpci_msix_res);
		sc->vtpci_msix_res = NULL;
	}

	if (sc->vtpci_res != NULL) {
		bus_release_resource(dev, SYS_RES_IOPORT, PCIR_BAR(0),
		    sc->vtpci_res);
		sc->vtpci_res = NULL;
	}

	return (0);
}

static int
nandsim_stop_ctrl(int num)
{
	device_t nexus;
	devclass_t nexus_devclass;
	int ret = 0;

	nand_debug(NDBG_SIM,"stop controller num:%d", num);

	if (num >= MAX_SIM_DEV) {
		return (EINVAL);
	}

	if (!ctrls[num].created || !ctrls[num].running) {
		return (ENODEV);
	}

	/* We will add our device as a child of the nexus0 device */
	if (!(nexus_devclass = devclass_find("nexus")) ||
	    !(nexus = devclass_get_device(nexus_devclass, 0))) {
		return (ENODEV);
	}

	mtx_lock(&Giant);
	if (ctrls[num].sim_ctrl_dev) {
		ret = device_delete_child(nexus, ctrls[num].sim_ctrl_dev);
		ctrls[num].sim_ctrl_dev = NULL;
	}
	mtx_unlock(&Giant);

	ctrls[num].running = 0;

	return (ret);
}

static int
zy7_ehci_detach(device_t dev)
{
	ehci_softc_t *sc = device_get_softc(dev);

	sc->sc_flags &= ~EHCI_SCFLG_DONEINIT;

	if (device_is_attached(dev))
		bus_generic_detach(dev);

	if (sc->sc_irq_res && sc->sc_intr_hdl)
		/* call ehci_detach() after ehci_init() called after
		 * successful bus_setup_intr().
		 */
		ehci_detach(sc);
	if (sc->sc_bus.bdev) {
		device_detach(sc->sc_bus.bdev);
		device_delete_child(dev, sc->sc_bus.bdev);
	}
	if (sc->sc_irq_res) {
		if (sc->sc_intr_hdl != NULL)
			bus_teardown_intr(dev, sc->sc_irq_res,
					  sc->sc_intr_hdl);
		bus_release_resource(dev, SYS_RES_IRQ,
			     rman_get_rid(sc->sc_irq_res), sc->sc_irq_res);
	}

	if (sc->sc_io_res)
		bus_release_resource(dev, SYS_RES_MEMORY,
			     rman_get_rid(sc->sc_io_res), sc->sc_io_res);
	usb_bus_mem_free_all(&sc->sc_bus, &ehci_iterate_hw_softc);

	return (0);
}

int
ig4iic_detach(ig4iic_softc_t *sc)
{
	int error;

	if (device_is_attached(sc->dev)) {
		error = bus_generic_detach(sc->dev);
		if (error)
			return (error);
	}
	if (sc->smb)
		device_delete_child(sc->dev, sc->smb);
	if (sc->intr_handle)
		bus_teardown_intr(sc->dev, sc->intr_res, sc->intr_handle);

	sx_xlock(&sc->call_lock);
	mtx_lock(&sc->io_lock);

	sc->smb = NULL;
	sc->intr_handle = NULL;
	reg_write(sc, IG4_REG_INTR_MASK, 0);
	reg_read(sc, IG4_REG_CLR_INTR);
	set_controller(sc, 0);

	mtx_unlock(&sc->io_lock);
	sx_xunlock(&sc->call_lock);
	return (0);
}

/*
 * Detach the driver from the hardware and other systems in the kernel.
 */
int
ed_detach(device_t dev)
{
	struct ed_softc *sc = device_get_softc(dev);
	struct ifnet *ifp = sc->ifp;

	if (mtx_initialized(ED_MUTEX(sc)))
		ED_ASSERT_UNLOCKED(sc);
	if (ifp) {
		ED_LOCK(sc);
		if (bus_child_present(dev))
			ed_stop(sc);
		ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
		ED_UNLOCK(sc);
		ether_ifdetach(ifp);
		callout_drain(&sc->tick_ch);
	}
	if (sc->irq_res != NULL && sc->irq_handle)
		bus_teardown_intr(dev, sc->irq_res, sc->irq_handle);
	ed_release_resources(dev);
	if (sc->miibus)
		device_delete_child(dev, sc->miibus);
	if (mtx_initialized(ED_MUTEX(sc)))
		ED_LOCK_DESTROY(sc);
	bus_generic_detach(dev);
	return (0);
}

static int
ohci_pci_detach(device_t self)
{
	ohci_softc_t *sc = device_get_softc(self);

	if (sc->sc_flags & OHCI_SCFLG_DONEINIT) {
		ohci_detach(sc, 0);
		sc->sc_flags &= ~OHCI_SCFLG_DONEINIT;
	}

	if (sc->irq_res && sc->ih) {
		int err = bus_teardown_intr(self, sc->irq_res, sc->ih);

		if (err)
			/* XXX or should we panic? */
			device_printf(self, "Could not tear down irq, %d\n",
			    err);
		sc->ih = NULL;
	}
	if (sc->sc_bus.bdev) {
		device_delete_child(self, sc->sc_bus.bdev);
		sc->sc_bus.bdev = NULL;
	}
	if (sc->irq_res) {
		bus_release_resource(self, SYS_RES_IRQ, 0, sc->irq_res);
		sc->irq_res = NULL;
	}
	if (sc->io_res) {
		bus_release_resource(self, SYS_RES_MEMORY, PCI_CBMEM, sc->io_res);
		sc->io_res = NULL;
		sc->iot = 0;
		sc->ioh = 0;
	}
	return 0;
}

static int
exynos_xhci_detach(device_t dev)
{
	struct exynos_xhci_softc *esc = device_get_softc(dev);
	device_t bdev;
	int err;

	if (esc->base.sc_bus.bdev != NULL) {
		bdev = esc->base.sc_bus.bdev;
		device_detach(bdev);
		device_delete_child(dev, bdev);
	}
	/* During module unload there are lots of children leftover */
	device_delete_children(dev);

	xhci_halt_controller(&esc->base);
	
	if (esc->res[2] && esc->base.sc_intr_hdl) {
		err = bus_teardown_intr(dev, esc->res[2],
		    esc->base.sc_intr_hdl);
		if (err) {
			device_printf(dev, "Could not tear down IRQ,"
			    " %d\n", err);
			return (err);
		}
	}

	bus_release_resources(dev, exynos_xhci_spec, esc->res);

	xhci_uninit(&esc->base);
	
	return (0);
}

int
ig4iic_detach(ig4iic_softc_t *sc)
{
	int error;

	mtx_lock(&sc->mtx);

	reg_write(sc, IG4_REG_INTR_MASK, 0);
	reg_read(sc, IG4_REG_CLR_INTR);
	set_controller(sc, 0);

	if (sc->generic_attached) {
		error = bus_generic_detach(sc->dev);
		if (error)
			goto done;
		sc->generic_attached = 0;
	}
	if (sc->smb) {
		device_delete_child(sc->dev, sc->smb);
		sc->smb = NULL;
	}
	if (sc->intr_handle) {
		bus_teardown_intr(sc->dev, sc->intr_res, sc->intr_handle);
		sc->intr_handle = NULL;
	}

	error = 0;
done:
	mtx_unlock(&sc->mtx);
	return error;
}

static int
imx_ehci_detach(device_t dev)
{
	struct imx_ehci_softc *sc;
	ehci_softc_t *esc;

	sc = device_get_softc(dev);

	esc = &sc->ehci_softc;

	if (esc->sc_bus.bdev != NULL)
		device_delete_child(dev, esc->sc_bus.bdev);
	if (esc->sc_flags & EHCI_SCFLG_DONEINIT)
		ehci_detach(esc);
	if (esc->sc_intr_hdl != NULL)
		bus_teardown_intr(dev, esc->sc_irq_res, 
		    esc->sc_intr_hdl);
	if (sc->ehci_irq_res != NULL)
		bus_release_resource(dev, SYS_RES_IRQ, 0, 
		    sc->ehci_irq_res);
	if (sc->ehci_mem_res != NULL)
		bus_release_resource(dev, SYS_RES_MEMORY, 0,
		    sc->ehci_mem_res);

	usb_bus_mem_free_all(&esc->sc_bus, &ehci_iterate_hw_softc);

	/* During module unload there are lots of children leftover */
	device_delete_children(dev);

	return (0);
}

static int
fm801_pci_detach(device_t dev)
{
	int r;
	struct fm801_info *fm801;

	DPRINT("Forte Media FM801 detach\n");

	fm801 = pcm_getdevinfo(dev);

	r = bus_generic_detach(dev);
	if (r)
		return r;
	if (fm801->radio != NULL) {
		r = device_delete_child(dev, fm801->radio);
		if (r)
			return r;
		fm801->radio = NULL;
	}

	r = pcm_unregister(dev);
	if (r)
		return r;

	bus_release_resource(dev, fm801->regtype, fm801->regid, fm801->reg);
	bus_teardown_intr(dev, fm801->irq, fm801->ih);
	bus_release_resource(dev, SYS_RES_IRQ, fm801->irqid, fm801->irq);
	bus_dma_tag_destroy(fm801->parent_dmat);
	kfree(fm801, M_DEVBUF);
	return 0;
}

static int
a10_ehci_detach(device_t self)
{
	ehci_softc_t *sc = device_get_softc(self);
	device_t bdev;
	int err;
	uint32_t reg_value = 0;

	if (sc->sc_bus.bdev) {
		bdev = sc->sc_bus.bdev;
		device_detach(bdev);
		device_delete_child(self, bdev);
	}
	/* during module unload there are lots of children leftover */
	device_delete_children(self);

	if (sc->sc_irq_res && sc->sc_intr_hdl) {
		/*
		 * only call ehci_detach() after ehci_init()
		 */
		ehci_detach(sc);

		err = bus_teardown_intr(self, sc->sc_irq_res, sc->sc_intr_hdl);

		if (err)
			/* XXX or should we panic? */
			device_printf(self, "Could not tear down irq, %d\n",
			    err);
		sc->sc_intr_hdl = NULL;
	}

	if (sc->sc_irq_res) {
		bus_release_resource(self, SYS_RES_IRQ, 0, sc->sc_irq_res);
		sc->sc_irq_res = NULL;
	}
	if (sc->sc_io_res) {
		bus_release_resource(self, SYS_RES_MEMORY, 0,
		    sc->sc_io_res);
		sc->sc_io_res = NULL;
	}
	usb_bus_mem_free_all(&sc->sc_bus, &ehci_iterate_hw_softc);

	/* Disable configure port */
	reg_value = A10_READ_4(sc, SW_SDRAM_REG_HPCR_USB2);
	reg_value &= ~SW_SDRAM_BP_HPCR_ACCESS;
	A10_WRITE_4(sc, SW_SDRAM_REG_HPCR_USB2, reg_value);

	/* Disable passby */
	reg_value = A10_READ_4(sc, SW_USB_PMU_IRQ_ENABLE);
	reg_value &= ~SW_AHB_INCR8; /* AHB INCR8 disable */
	reg_value &= ~SW_AHB_INCR4; /* AHB burst type INCR4 disable */
	reg_value &= ~SW_AHB_INCRX_ALIGN; /* AHB INCRX align disable */
	reg_value &= ~SW_ULPI_BYPASS; /* ULPI bypass disable */
	A10_WRITE_4(sc, SW_USB_PMU_IRQ_ENABLE, reg_value);

	/* Disable clock for USB */
	a10_clk_usb_deactivate();

	return (0);
}