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------- Comment From hbabu@xxxxxxxxxx 2015-10-14 19:59 EDT-------
Even though this bug happens rarely, causes data corruption in these cases. Patch is accepted in maintainer's tree. The fix is so simple and affects only nx842 driver - basically adds CRC flag for compression and decompression calls to nx842 co-processor. Please include this fix.

https://git.kernel.org/cgit/linux/kernel/git/herbert/cryptodev-2.6.git/commit/?id=ea0b3984c1cc8b28de27a3bec285102b4e366a4c

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https://bugs.launchpad.net/bugs/1497878

Title:
  nx842: Corrupted data during uncompression due to HW issue

Status in linux package in Ubuntu:
  Triaged

Bug description:
  == Comment: #0 - Haren Myneni <hbabu@xxxxxxxxxx> - 2015-09-19 20:35:29 ==
  ---Problem Description---
  Hardware team reported some rare data corruption during uncompression for nx842 co-processor. It might provide user with invalid data after uncompression. So the fix is add CRC support - means Linux adds CRC flag before calling the nx842 so that CRC will be added and checked during compression and uncompression calls.  

   
  Contact Information = hbabu@xxxxxxxxxx 
   
  ---uname output---
  Ubuntu 15.10
   
  Machine Type = power8 
   
  ---Debugger---
  A debugger is not configured
   
  ---Steps to Reproduce---
   HW team reported this issue and discussed with them for the possible solution.
   
  Stack trace output:
   no
   
  Oops output:
   no
   
  System Dump Info:
    The system is not configured to capture a system dump.
   
  *Additional Instructions for hbabu@xxxxxxxxxx: 
  -Attach sysctl -a output output to the bug.

  == Comment: #1 - Haren Myneni <hbabu@xxxxxxxxxx> - 2015-09-19 20:36:14 ==
  The fix is simple with just adding CRC flags before invoking nx842 coprocessor calls. Posted patch and waiting for maintainer to get in to his tree. 

  http://marc.info/?l=linux-crypto-vger&m=144270742211554&w=2

  Please include this fix in ubuntu 15.10 release.

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