tree a17a4c1b21ecad8f0f069eab55a5f9ce3ed1fa2a
parent 684d50132fdd68f4c2cba9e65b50f9b8ef4c5164
author John Snow <jsnow@redhat.com> 1435989965 -0400
committer John Snow <jsnow@redhat.com> 1435989965 -0400

ahci: Do not map cmd_fis to generate response

The Register D2H FIS should copy the current values of
the registers instead of just parroting back the same
values the guest sent back to it.

In this case, the SECTOR COUNT variables are actually
not generally meaningful in terms of standard commands
(See ATA8-AC3 Section 9.2 Normal Outputs), so it actually
probably doesn't matter what we put in here.

Meanwhile, we do need to use the Register update FIS from
the NCQ pathways (in error cases), so getting rid of
references to cur_cmd here is a win for AHCI concurrency.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1435767578-32743-14-git-send-email-jsnow@redhat.com