bionic: regression tested on a d05 system:

ubuntu@d05-3:~$ cat /proc/version
Linux version 4.15.0-44-generic (buildd@bos02-arm64-010) (gcc version 7.3.0 
(Ubuntu/Linaro 7.3.0-16ubuntu3)) #47-Ubuntu SMP Mon Jan 14 11:32:55 UTC 2019
ubuntu@d05-3:~$ ls -l /dev/disk/by-path | cat
total 0
lrwxrwxrwx 1 root root  9 Jan 16 19:56 
platform-HISI0162:00-sas-exp0x500e004aaaaaaa1f-phy0-lun-0 -> ../../sda
lrwxrwxrwx 1 root root 10 Jan 16 19:56 
platform-HISI0162:00-sas-exp0x500e004aaaaaaa1f-phy0-lun-0-part1 -> ../../sda1
lrwxrwxrwx 1 root root 10 Jan 16 19:56 
platform-HISI0162:00-sas-exp0x500e004aaaaaaa1f-phy0-lun-0-part2 -> ../../sda2
lrwxrwxrwx 1 root root  9 Jan 16 19:43 
platform-PNP0D20:00-usb-0:1.3:1.0-scsi-0:0:0:0 -> ../../sdc
lrwxrwxrwx 1 root root 10 Jan 16 19:43 
platform-PNP0D20:00-usb-0:1.3:1.0-scsi-0:0:0:0-part1 -> ../../sdc1

** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic

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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1809046

Title:
  Cannot initialize ATA disk if IDENTIFY command fails

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed
Status in linux source package in Cosmic:
  Fix Committed
Status in linux source package in Disco:
  Fix Committed

Bug description:
  [Impact]
  ATA disks attached to a SAS controller may not initialize if the initial 
IDENTIFY command fails.

  [Test Case]
  The positive test case would require a disk that fails to respond correctly 
to an IDENTIFY command. I don't have one of those, so can only regression test 
on a system w/ SAS connected disks.

  [Fix]
  437207d3697f5 scsi: libsas: check the ata device status by ata_dev_enabled()

  [Regression Risk]
  Clean cherry pick from upstream - any regressions will have upstream support.

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