This series is to solve the problem of a BUG() when adding phy with zero
address to a new port.

v4 -> v5
1. Add new helper sas_port_add_ex_phy() based on John's suggestion.
2. Move sas_add_parent_port() to sas_expander.c based on John's suggestion.
3. Update the comments.

v3 -> v4:
1. Update patch title and comments based on John's suggestion.

v2 -> v3:
1. Set ex_dev->parent_port to NULL when the number of PHYs of the parent
   port becomes 0.
2. Update the comments.

v1 -> v2:
1. Set ex_phy->port with parent_port when ex_phy is added to the parent
   port.
2. Set ex_phy to NULL when free expander.
3. Update the comments.

Xingui Yang (3):
  scsi: libsas: Add helper for port add ex_phy
  scsi: libsas: Move sas_add_parent_port() to sas_expander.c
  scsi: libsas: Fix the failure of adding phy with zero-address to port

 drivers/scsi/libsas/sas_expander.c | 34 ++++++++++++++++++++++++------
 drivers/scsi/libsas/sas_internal.h | 15 -------------
 2 files changed, 28 insertions(+), 21 deletions(-)

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2.17.1