v1->v2: add a new patch that introduces get_device_unless_zero() method.

Hello, This patchset introduces get_device_unless_zero() method, Avoid
dev's reference count from 0 to 1, as this will cause bugs in some parts
of the kernel. 

We used this method when we fixed an issue with iSCSI delete order.
Zhong Jinghua (2):
  driver core: introduce get_device_unless_zero()
  scsi: fix iscsi rescan fails to create block device

 drivers/base/core.c       | 8 ++++++++
 drivers/scsi/scsi_sysfs.c | 4 +---
 include/linux/device.h    | 1 +
 3 files changed, 10 insertions(+), 3 deletions(-)

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2.31.1