[libata passthru] address slave devices correctly

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index 261be24e1df3..0df4b682965d 100644
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -2276,6 +2276,12 @@ ata_scsi_pass_thru(struct ata_queued_cmd *qc, const u8 *scsicmd)
                 tf->device = scsicmd[8];
                 tf->command = scsicmd[9];
         }
+        /*
+         * If slave is possible, enforce correct master/slave bit
+        */
+        if (qc->ap->flags & ATA_FLAG_SLAVE_POSS)
+                tf->device = qc->dev->devno ?
+                        tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
 
         /*
          * Filter SET_FEATURES - XFER MODE command -- otherwise,