1 files changed, 6 insertions, 17 deletions

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 1cea18f62abc..6e15c5ddae6d 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -832,24 +832,16 @@ static void ata_scsi_dev_config(struct scsi_device *sdev,
         /* configure max sectors */
         blk_queue_max_sectors(sdev->request_queue, dev->max_sectors);
 
-        /* SATA DMA transfers must be multiples of 4 byte, so
-         * we need to pad ATAPI transfers using an extra sg.
-         * Decrement max hw segments accordingly.
-         */
-        if (dev->class == ATA_DEV_ATAPI) {
-                struct request_queue *q = sdev->request_queue;
-                blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
-
+        if (dev->class == ATA_DEV_ATAPI)
                 /* set the min alignment */
                 blk_queue_update_dma_alignment(sdev->request_queue,
                                                ATA_DMA_PAD_SZ - 1);
-        } else
+        else {
                 /* ATA devices must be sector aligned */
                 blk_queue_update_dma_alignment(sdev->request_queue,
                                                ATA_SECT_SIZE - 1);
-
-        if (dev->class == ATA_DEV_ATA)
                 sdev->manage_start_stop = 1;
+        }
 
         if (dev->flags & ATA_DFLAG_AN)
                 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
@@ -2500,7 +2492,7 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
          * want to set it properly, and for DMA where it is
          * effectively meaningless.
          */
-        nbytes = min(qc->nbytes, (unsigned int)63 * 1024);
+        nbytes = min(scmd->request->raw_data_len, (unsigned int)63 * 1024);
 
         /* Most ATAPI devices which honor transfer chunk size don't
          * behave according to the spec when odd chunk size which
@@ -3555,7 +3547,7 @@ EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
  *      @ap: Port to initialize
  *
  *      Called just after data structures for each port are
- *      initialized.  Allocates DMA pad.
+ *      initialized.
  *
  *      May be used as the port_start() entry in ata_port_operations.
  *
@@ -3564,7 +3556,7 @@ EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
  */
 int ata_sas_port_start(struct ata_port *ap)
 {
-        return ata_pad_alloc(ap, ap->dev);
+        return 0;
 }
 EXPORT_SYMBOL_GPL(ata_sas_port_start);
 
@@ -3572,8 +3564,6 @@ EXPORT_SYMBOL_GPL(ata_sas_port_start);
  *      ata_port_stop - Undo ata_sas_port_start()
  *      @ap: Port to shut down
  *
- *      Frees the DMA pad.
- *
  *      May be used as the port_stop() entry in ata_port_operations.
  *
  *      LOCKING:
@@ -3582,7 +3572,6 @@ EXPORT_SYMBOL_GPL(ata_sas_port_start);
 
 void ata_sas_port_stop(struct ata_port *ap)
 {
-        ata_pad_free(ap, ap->dev);
 }
 EXPORT_SYMBOL_GPL(ata_sas_port_stop);