** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Changed in: linux (Ubuntu)
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) => 
Canonical Kernel Team (canonical-kernel-team)

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https://bugs.launchpad.net/bugs/1762367

Title:
  Warning "cache flush timed out!" seen when unloading the cxl driver

Status in The Ubuntu-power-systems project:
  Triaged
Status in linux package in Ubuntu:
  New

Bug description:
  == Comment: #0 - Vaibhav Jain <vajai...@in.ibm.com> - 2018-04-09 04:58:46 ==
  ---Problem Description---
  CXL driver reports a warning message when performing cache flush. This is due 
to data-cache not present on some of the CAPI adapters hence the data-cache 
operation fails and results in this error.

  "WARNING: cache flush timed out"
   
  Contact Information = Vaibha Jain <vajai...@in.ibm.com> 
   
  ---uname output---
  4.15.0-12-generic
   
  ---Additional Hardware Info---
  Nallatech Flash GT+ adapter 

   
  Machine Type = Boston-LC  
   
  ---Debugger---
  A debugger is not configured
   
  ---Steps to Reproduce---
   * Make sure that cxl module is loaded
  * Issue command 'rmmod cxl'
  Error seen in the kernel logs:
  dmesg
  [ 1203.791963] pci_bus 0006:00: busn_res: [bus 00] is released
  [ 1203.792096] cxl afu0.0: Deactivating AFU directed mode
  [ 1208.792711] cxl card0: WARNING: cache flush timed out!


  The fix for this issue was merged to the mainline kernel via commit:

  94322ed8e857 cxl: Check if PSL data-cache is available before issue
  flush request

  == Comment: #3 - Vaibhav Jain <vajai...@in.ibm.com> - 2018-04-09 05:02:20 ==
  The fix for this issue was merged to the mainline kernel via commit:

  94322ed8e857 cxl: Check if PSL data-cache is available before issue
  flush request

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