[SCSI] libsas, libata: fix start of life for a sas ata_port
authorDan Williams <dan.j.williams@intel.com>
Thu, 22 Mar 2012 04:09:07 +0000 (21:09 -0700)
committerVarun Wadekar <vwadekar@nvidia.com>
Mon, 14 May 2012 12:36:35 +0000 (17:36 +0530)
commitedf70c77e85c79bb8885dd5f6a90d779245f89f9
tree2a32cf37d9871d57b29129a1d13a12bf0abbb8a8
parentd21a5ac8f2953494a490815f5e147f761b6cf67c
[SCSI] libsas, libata: fix start of life for a sas ata_port

This changes the ordering of initialization and probing events from:
  1/ allocate rphy in PORTE_BYTES_DMAED, DISCE_REVALIDATE_DOMAIN
  2/ allocate ata_port and schedule port probe in DISCE_PROBE
...to:
  1/ allocate ata_port in PORTE_BYTES_DMAED, DISCE_REVALIDATE_DOMAIN
  2/ allocate rphy in PORTE_BYTES_DMAED, DISCE_REVALIDATE_DOMAIN
  3/ schedule port probe in DISCE_PROBE

This ordering prevents PHYE_SIGNAL_LOSS_EVENTS from sneaking in to
destrory ata devices before they have been fully initialized:

  BUG: unable to handle kernel paging request at 0000000000003b10
  IP: [<ffffffffa0053d7e>] sas_ata_end_eh+0x12/0x5e [libsas]
  ...
  [<ffffffffa004d1af>] sas_unregister_common_dev+0x78/0xc9 [libsas]
  [<ffffffffa004d4d4>] sas_unregister_dev+0x4f/0xad [libsas]
  [<ffffffffa004d5b1>] sas_unregister_domain_devices+0x7f/0xbf [libsas]
  [<ffffffffa004c487>] sas_deform_port+0x61/0x1b8 [libsas]
  [<ffffffffa004bed0>] sas_phye_loss_of_signal+0x29/0x2b [libsas]

...and kills the awkward "sata domain_device briefly existing in the
domain without an ata_port" state.

Reported-by: Michal Kosciowski <michal.kosciowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
drivers/ata/libata-scsi.c
drivers/scsi/ipr.c
drivers/scsi/libsas/sas_ata.c
drivers/scsi/libsas/sas_discover.c
drivers/scsi/libsas/sas_expander.c
include/linux/libata.h
include/scsi/sas_ata.h