Merge branch 'for-3.19-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata into for-3.20

09c32aaa ("ahci_xgene: Fix the dma state machine lockup for the
ATA_CMD_SMART PIO mode command.") missed 3.19 release.  Fold it into
for-3.20.
Signed-off-by: Tejun Heo <tj@kernel.org>