scsi: Add dma direction member to command structure

Some SCSI devices like UFS use DMA for executing scsi commands and hence
need to know the direction of transfer of the dma. Add a dma_dir element
to the command structure to facilitate this.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>

include/scsi.h

@@ -6,6 +6,8 @@
  #ifndef _SCSI_H
  #define _SCSI_H
 
+#include <linux/dma-direction.h>
+
 struct scsi_cmd {
 	unsigned char		cmd[16];					/* command				   */
 	/* for request sense */
@@ -26,6 +28,7 @@ struct scsi_cmd {
 	unsigned long		trans_bytes;			/* tranfered bytes		*/
 
 	unsigned int		priv;
+	enum dma_data_direction	dma_dir;
 };
 
 /*-----------------------------------------------------------