Revert "scsi: fix iscsi rescan fails to create block"

hulk inclusion
category: bugfix
bugzilla: 188150, https://gitee.com/openeuler/kernel/issues/I643OL



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This reverts commit 3b649a02.

This commit has a soft lock problem:

watchdog: BUG: soft lockup - CPU#22 stuck for 67s! [iscsid:16369]
 Call Trace:
  scsi_remove_target+0x548/0x7b0
  ? sdev_store_delete+0x90/0x90
  ? __mutex_lock_slowpath+0x10/0x10
  ? device_remove_class_symlinks+0x1b0/0x1b0
  __iscsi_unbind_session+0x16b/0x250 [scsi_transport_iscsi]
  iscsi_remove_session+0x1d3/0x2f0 [scsi_transport_iscsi]
  iscsi_session_remove+0x5c/0x80 [libiscsi]
  iscsi_sw_tcp_session_destroy+0xd3/0x160 [iscsi_tcp]
  iscsi_if_rx+0x2369/0x5060 [scsi_transport_iscsi]

The reason is that if other threads hold the reference count of the
kobject while waiting for the device to be released, it will keep
waiting in a loop.

Fixes: 3b649a02 ("scsi: fix iscsi rescan fails to create block")
Signed-off-by: Zhong Jinghua <zhongjinghua@huawei.com>
Reviewed-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>