1 files changed, 20 insertions, 3 deletions

diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index 1e3792f86fc..eb604b0a899 100644
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -39,6 +39,7 @@
 #include <scsi/scsi.h>
 #include "scsi.h"
 #include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
 #include <linux/libata.h>
 #include <linux/hdreg.h>
 #include <asm/uaccess.h>
@@ -354,10 +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 {
@@ -701,6 +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 */
@@ -2405,8 +2416,12 @@ int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
 	struct ata_port *ap;
 	struct ata_device *dev;
 	struct scsi_device *scsidev = cmd->device;
+	struct Scsi_Host *shost = scsidev->host;
 
-	ap = (struct ata_port *) &scsidev->host->hostdata[0];
+	ap = (struct ata_port *) &shost->hostdata[0];
+
+	spin_unlock(shost->host_lock);
+	spin_lock(&ap->host_set->lock);
 
 	ata_scsi_dump_cdb(ap, cmd);
 
@@ -2429,6 +2444,8 @@ int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
 		ata_scsi_translate(ap, dev, cmd, done, atapi_xlat);
 
 out_unlock:
+	spin_unlock(&ap->host_set->lock);
+	spin_lock(shost->host_lock);
 	return 0;
 }