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https://bugs.launchpad.net/bugs/1517942

Title:
  Backport upstream commit to Ubuntu 15.10 (Wily) SRU stream

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Wily:
  Fix Committed
Status in linux source package in Xenial:
  Fix Released

Bug description:
  == Comment: #0 - UMA KRISHNAN <ukrishn@xxxxxxxxxx> - 2015-11-18 16:27:06 ==
  ---Problem Description---
  When FC login times out, cxlflash resets the link. As part of reset, when the link comes back up, cxlflash driver calls scsi_scan_host() and in case previous scan is still running  we get the message and stack dump on console/logs.

  scsi host2: scsi_prep_async_scan called twice
  CPU: 16 PID: 55 Comm: kworker/16:1 Not tainted 4.2.0-439-f9a408a+ #1
  Workqueue: events cxlflash_worker_thread [cxlflash]
  Call Trace:
  [c00000078bea7ae0] [c000000000a6e720] dump_stack+0x90/0xbc (unreliable)
  [c00000078bea7b10] [c0000000006f539c] scsi_scan_host+0x28c/0x2a0
  [c00000078bea7bb0] [d000000004085344] cxlflash_worker_thread+0x144/0x430 [cxlflash]
  [c00000078bea7c50] [c0000000000d8b64] process_one_work+0x1a4/0x4c0
  [c00000078bea7ce0] [c0000000000d9014] worker_thread+0x194/0x5f0
  [c00000078bea7d80] [c0000000000e1630] kthread+0x110/0x130
  [c00000078bea7e30] [c000000000009530] ret_from_kernel_thread+0x5c/0xac
  cxlflash 0009:00:00.0: cxlflash_async_err_irq: FC Port 1 -> login succeeded, fc_status 0x114001D80000F

  This message is alarming to customers. Community has already fixed this. We would like to see the upstreamed commit a4cf30e15ccea82a07fa5870e8af787b9ea1a672 (scsi_scan: don't dump trace when scsi_prep_async_scan() is called twice)  backported to Ubuntu 15.10 (Wily) SRU stream.
   
  ---uname output---
  Linux tul83p1 4.2.0-444-5b49ef1+ #1 SMP Wed Nov 18 12:44:21 CST 2015 ppc64le ppc64le ppc64le GNU/Linux
   
  Machine Type = 8286-42A 
   
  ---Debugger---
  A debugger is not configured
   
  ---Steps to Reproduce---
   Simply disconnecting the adapter and plugging it back in, triggers this scenario.
   
  Contact Information = ukrishn@xxxxxxxxxxxxxxxxxx 
   
  Stack trace output:
   no
   
  Oops output:
   no
   
  System Dump Info:
    The system is not configured to capture a system dump.
   
  *Additional Instructions for ukrishn@xxxxxxxxxxxxxxxxxx: 
  -Attach sysctl -a output output to the bug.

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