isci: fix ata locking

Upstream commit a29b5dad "libata: fix locking for sas paths" switched
libsas ata locking to the ata_host lock.  We need to do the same when
returning ata tasks from the execute path.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2011-05-05 17:47:44 -07:00
commit 5b3f2bd877