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== 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.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New


** Tags: architecture-ppc64le bugnameltc-133324 severity-medium targetmilestone-inin---
-- 
Backport upstream commit to Ubuntu 15.10 (Wily) SRU stream
https://bugs.launchpad.net/bugs/1517942
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