[PATCH #upstream-fixes] libata: use atapi_cmd_type() to determine cmd type instead of transfer size

[Tejun Heo <htejun@gmail.com>]

pata_ali and pata_it821x were using qc->nbytes to determine whether a
command is data transfer type or not.  As now qc->nbytes can be
extended by padding and draining buffers, this tests are not useful
anymore.  Use atapi_cmd_type() instead.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
---
 drivers/ata/pata_ali.c    |    2 +-
 drivers/ata/pata_it821x.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/ata/pata_ali.c b/drivers/ata/pata_ali.c
index 7e68edf..8786455 100644
--- a/drivers/ata/pata_ali.c
+++ b/drivers/ata/pata_ali.c
@@ -295,7 +295,7 @@ static void ali_lock_sectors(struct ata_device *adev)
 static int ali_check_atapi_dma(struct ata_queued_cmd *qc)
 {
 	/* If its not a media command, its not worth it */
-	if (qc->nbytes < 2048)
+	if (atapi_cmd_type(qc->cdb[0]) == ATAPI_MISC)
 		return -EOPNOTSUPP;
 	return 0;
 }
diff --git a/drivers/ata/pata_it821x.c b/drivers/ata/pata_it821x.c
index 109ddd4..f751749 100644
--- a/drivers/ata/pata_it821x.c
+++ b/drivers/ata/pata_it821x.c
@@ -564,7 +564,7 @@ static int it821x_check_atapi_dma(struct ata_queued_cmd *qc)
 	struct it821x_dev *itdev = ap->private_data;
 
 	/* Only use dma for transfers to/from the media. */
-	if (qc->nbytes < 2048)
+	if (atapi_cmd_type(qc->cdb[0]) == ATAPI_MISC)
 		return -EOPNOTSUPP;
 
 	/* No ATAPI DMA in smart mode */