Comment # 5 on bug 1179158 from Coly Li

(In reply to Coly Li from comment #4)
> (In reply to Hannes Reinecke from comment #3)
> > Coly, can you have a look?
> 
> Yes. This is an upstream bug, the maintainer is about to revert the
> problematic patch from mainline. I will do similar thing for our kernel.

The following patches should be reverted from our kernel,
      Revert "dm raid: remove unnecessary discard limits for raid10"
      Revert "md/raid10: improve discard request for far layout"
      Revert "md/raid10: improve raid10 discard request"
      Revert "md/raid10: pull codes that wait for blocked dev into one
function"
      Revert "md/raid10: extend r10bio devs to raid disks"
      Revert "md: add md_submit_discard_bio() for submitting discard bio"

Working on it now.

Coly Li