Merge branch 'master'

[powerpc.git] / drivers / scsi / libata-scsi.c

diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index 4f8a013..0dc5503 100644 (file)
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -355,10 +355,10 @@ struct ata_queued_cmd *ata_scsi_qc_new(struct ata_port *ap,
                qc->scsidone = done;
 
                if (cmd->use_sg) {
-                       qc->sg = (struct scatterlist *) cmd->request_buffer;
+                       qc->__sg = (struct scatterlist *) cmd->request_buffer;
                        qc->n_elem = cmd->use_sg;
                } else {
-                       qc->sg = &qc->sgent;
+                       qc->__sg = &qc->sgent;
                        qc->n_elem = 1;
                }
        } else {
@@ -702,6 +702,16 @@ int ata_scsi_slave_config(struct scsi_device *sdev)
                         */
                        blk_queue_max_sectors(sdev->request_queue, 2048);
                }
+
+               /*
+                * 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) {
+                       request_queue_t *q = sdev->request_queue;
+                       blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
+               }
        }
 
        return 0;       /* scsi layer doesn't check return value, sigh */