Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

Pull SCSI fix from James Bottomley:
 "One fix for an endless error loop with the target driver affecting
  tapes"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: target: pscsi: Set SCF_TREAT_READ_AS_NORMAL flag only if there is valid data

Author: torvalds

drivers/target/target_core_pscsi.c

@@ -588,7 +588,7 @@ static void pscsi_destroy_device(struct se_device *dev)
 }
 
 static void pscsi_complete_cmd(struct se_cmd *cmd, u8 scsi_status,
-			       unsigned char *req_sense)
+			       unsigned char *req_sense, int valid_data)
 {
 	struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
 	struct scsi_device *sd = pdv->pdv_sd;
@@ -681,7 +681,7 @@ static void pscsi_complete_cmd(struct se_cmd *cmd, u8 scsi_status,
 		 * back despite framework assumption that a
 		 * check condition means there is no data
 		 */
-		if (sd->type == TYPE_TAPE &&
+		if (sd->type == TYPE_TAPE && valid_data &&
 		    cmd->data_direction == DMA_FROM_DEVICE) {
 			/*
 			 * is sense data valid, fixed format,
@@ -1032,19 +1032,19 @@ static void pscsi_req_done(struct request *req, blk_status_t status)
 	struct se_cmd *cmd = req->end_io_data;
 	struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req);
 	enum sam_status scsi_status = scmd->result & 0xff;
+	int valid_data = cmd->data_length - scmd->resid_len;
 	u8 *cdb = cmd->priv;
 
 	if (scsi_status != SAM_STAT_GOOD) {
 		pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
 			" 0x%02x Result: 0x%08x\n", cmd, cdb[0], scmd->result);
 	}
 
-	pscsi_complete_cmd(cmd, scsi_status, scmd->sense_buffer);
+	pscsi_complete_cmd(cmd, scsi_status, scmd->sense_buffer, valid_data);
 
 	switch (host_byte(scmd->result)) {
 	case DID_OK:
-		target_complete_cmd_with_length(cmd, scsi_status,
-			cmd->data_length - scmd->resid_len);
+		target_complete_cmd_with_length(cmd, scsi_status, valid_data);
 		break;
 	default:
 		pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"