scsi_scan.c (633b47cb009d09dc8f4ba9cdb3a0ca138809c7c7) scsi_scan.c (ff48b37802e5c134e2dfc4d091f10b2eb5065a72)
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * scsi_scan.c
4 *
5 * Copyright (C) 2000 Eric Youngdale,
6 * Copyright (C) 2002 Patrick Mansfield
7 *
8 * The general scanning/probing algorithm is as follows, exceptions are

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817 * request, and then spun up on request.
818 */
819
820 /*
821 * The scanning code needs to know the scsi_level, even if no
822 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
823 * non-zero LUNs can be scanned.
824 */
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * scsi_scan.c
4 *
5 * Copyright (C) 2000 Eric Youngdale,
6 * Copyright (C) 2002 Patrick Mansfield
7 *
8 * The general scanning/probing algorithm is as follows, exceptions are

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817 * request, and then spun up on request.
818 */
819
820 /*
821 * The scanning code needs to know the scsi_level, even if no
822 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
823 * non-zero LUNs can be scanned.
824 */
825 sdev->scsi_level = inq_result[2] & 0x0f;
825 sdev->scsi_level = inq_result[2] & 0x07;
826 if (sdev->scsi_level >= 2 ||
827 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
828 sdev->scsi_level++;
829 sdev->sdev_target->scsi_level = sdev->scsi_level;
830
831 /*
832 * If SCSI-2 or lower, and if the transport requires it,
833 * store the LUN value in CDB[1].

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1614 if (IS_ERR(sdev))
1615 return PTR_ERR(sdev);
1616
1617 scsi_device_put(sdev);
1618 return 0;
1619}
1620EXPORT_SYMBOL(scsi_add_device);
1621
826 if (sdev->scsi_level >= 2 ||
827 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
828 sdev->scsi_level++;
829 sdev->sdev_target->scsi_level = sdev->scsi_level;
830
831 /*
832 * If SCSI-2 or lower, and if the transport requires it,
833 * store the LUN value in CDB[1].

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1614 if (IS_ERR(sdev))
1615 return PTR_ERR(sdev);
1616
1617 scsi_device_put(sdev);
1618 return 0;
1619}
1620EXPORT_SYMBOL(scsi_add_device);
1621
1622void scsi_rescan_device(struct scsi_device *sdev)
1622int scsi_rescan_device(struct scsi_device *sdev)
1623{
1624 struct device *dev = &sdev->sdev_gendev;
1623{
1624 struct device *dev = &sdev->sdev_gendev;
1625 int ret = 0;
1625
1626 device_lock(dev);
1627
1626
1627 device_lock(dev);
1628
1629 /*
1630 * Bail out if the device is not running. Otherwise, the rescan may
1631 * block waiting for commands to be executed, with us holding the
1632 * device lock. This can result in a potential deadlock in the power
1633 * management core code when system resume is on-going.
1634 */
1635 if (sdev->sdev_state != SDEV_RUNNING) {
1636 ret = -EWOULDBLOCK;
1637 goto unlock;
1638 }
1639
1628 scsi_attach_vpd(sdev);
1629 scsi_cdl_check(sdev);
1630
1631 if (sdev->handler && sdev->handler->rescan)
1632 sdev->handler->rescan(sdev);
1633
1634 if (dev->driver && try_module_get(dev->driver->owner)) {
1635 struct scsi_driver *drv = to_scsi_driver(dev->driver);
1636
1637 if (drv->rescan)
1638 drv->rescan(dev);
1639 module_put(dev->driver->owner);
1640 }
1640 scsi_attach_vpd(sdev);
1641 scsi_cdl_check(sdev);
1642
1643 if (sdev->handler && sdev->handler->rescan)
1644 sdev->handler->rescan(sdev);
1645
1646 if (dev->driver && try_module_get(dev->driver->owner)) {
1647 struct scsi_driver *drv = to_scsi_driver(dev->driver);
1648
1649 if (drv->rescan)
1650 drv->rescan(dev);
1651 module_put(dev->driver->owner);
1652 }
1653
1654unlock:
1641 device_unlock(dev);
1655 device_unlock(dev);
1656
1657 return ret;
1642}
1643EXPORT_SYMBOL(scsi_rescan_device);
1644
1645static void __scsi_scan_target(struct device *parent, unsigned int channel,
1646 unsigned int id, u64 lun, enum scsi_scan_mode rescan)
1647{
1648 struct Scsi_Host *shost = dev_to_shost(parent);
1649 blist_flags_t bflags = 0;

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1659EXPORT_SYMBOL(scsi_rescan_device);
1660
1661static void __scsi_scan_target(struct device *parent, unsigned int channel,
1662 unsigned int id, u64 lun, enum scsi_scan_mode rescan)
1663{
1664 struct Scsi_Host *shost = dev_to_shost(parent);
1665 blist_flags_t bflags = 0;

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