scsi: core: Kill DRIVER_SENSE

Replace the check for DRIVER_SENSE with a check for
scsi_status_is_check_condition().

Audit all callsites to ensure the SAM status is set correctly. For
backwards compability move the DRIVER_SENSE definition to sg.h, and update
sg, bsg, and scsi_ioctl to set the DRIVER_SENSE driver_status whenever
SAM_STAT_CHECK_CONDITION is present.

[mkp: fix zeroday srp warning]

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Hannes Reinecke <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

fix

block/bsg.c

···
 	hdr->device_status = sreq->result & 0xff;
 	hdr->transport_status = host_byte(sreq->result);
 	hdr->driver_status = driver_byte(sreq->result);
+	if (scsi_status_is_check_condition(sreq->result))
+		hdr->driver_status = DRIVER_SENSE;
 	hdr->info = 0;
 	if (hdr->device_status || hdr->transport_status || hdr->driver_status)
 		hdr->info |= SG_INFO_CHECK;

block/scsi_ioctl.c

···
 	hdr->msg_status = msg_byte(req->result);
 	hdr->host_status = host_byte(req->result);
 	hdr->driver_status = driver_byte(req->result);
+	if (scsi_status_is_check_condition(hdr->status))
+		hdr->driver_status = DRIVER_SENSE;
 	hdr->info = 0;
 	if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 		hdr->info |= SG_INFO_CHECK;

drivers/ata/libata-scsi.c

···
 		rc = cmd_result;
 		goto error;
 	}
-	if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
+	if (scsi_sense_valid(&sshdr)) {/* sense data available */
 		u8 *desc = sensebuf + 8;
-		cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
 
 		/* If we set cc then ATA pass-through will cause a
 		 * check condition even if no error. Filter that. */
-		if (cmd_result & SAM_STAT_CHECK_CONDITION) {
+		if (scsi_status_is_check_condition(cmd_result)) {
 			if (sshdr.sense_key == RECOVERED_ERROR &&
 			    sshdr.asc == 0 && sshdr.ascq == 0x1d)
 				cmd_result &= ~SAM_STAT_CHECK_CONDITION;
···
 		rc = cmd_result;
 		goto error;
 	}
-	if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
+	if (scsi_sense_valid(&sshdr)) {/* sense data available */
 		u8 *desc = sensebuf + 8;
-		cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
 
 		/* If we set cc then ATA pass-through will cause a
 		 * check condition even if no error. Filter that. */
···
 
 	memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
 
-	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
-
 	/*
 	 * Use ata_to_sense_error() to map status register bits
 	 * onto sense key, asc & ascq.
···
 	u8 sense_key, asc, ascq;
 
 	memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
-
-	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
 
 	if (ata_dev_disabled(dev)) {
 		/* Device disabled after error recovery */
···
 
 	case REQUEST_SENSE:
 		ata_scsi_set_sense(dev, cmd, 0, 0, 0);
-		cmd->result = (DRIVER_SENSE << 24);
 		break;
 
 	/* if we reach this, then writeback caching is disabled,

drivers/scsi/NCR5380.c

···
 			scsi_eh_restore_cmnd(cmd, &hostdata->ses);
 		} else {
 			scsi_eh_restore_cmnd(cmd, &hostdata->ses);
-			set_driver_byte(cmd, DRIVER_SENSE);
+			set_status_byte(cmd, SAM_STAT_CHECK_CONDITION);
 		}
 		hostdata->sensing = NULL;
 	}

drivers/scsi/advansys.c

···
 				ASC_DBG(2, "SAM_STAT_CHECK_CONDITION\n");
 				ASC_DBG_PRT_SENSE(2, scp->sense_buffer,
 						  SCSI_SENSE_BUFFERSIZE);
-				set_driver_byte(scp, DRIVER_SENSE);
 			}
 			break;
 
···
 				ASC_DBG(2, "SAM_STAT_CHECK_CONDITION\n");
 				ASC_DBG_PRT_SENSE(2, scp->sense_buffer,
 						  SCSI_SENSE_BUFFERSIZE);
-				set_driver_byte(scp, DRIVER_SENSE);
 			}
 			break;
 

drivers/scsi/aic7xxx/aic79xx_osm.c

···
 			memcpy(cmd->sense_buffer,
 			       ahd_get_sense_buf(ahd, scb)
 			       + sense_offset, sense_size);
-			cmd->result |= (DRIVER_SENSE << 24);
+			set_status_byte(cmd, SAM_STAT_CHECK_CONDITION);
 
 #ifdef AHD_DEBUG
 			if (ahd_debug & AHD_SHOW_SENSE) {
···
 	int new_status = DID_OK;
 	int do_fallback = 0;
 	int scsi_status;
+	struct scsi_sense_data *sense;
 
 	/*
 	 * Map CAM error codes into Linux Error codes.  We
···
 		switch(scsi_status) {
 		case SAM_STAT_COMMAND_TERMINATED:
 		case SAM_STAT_CHECK_CONDITION:
-			if ((cmd->result >> 24) != DRIVER_SENSE) {
+			sense = (struct scsi_sense_data *)
+				cmd->sense_buffer;
+			if (sense->extra_len >= 5 &&
+			    (sense->add_sense_code == 0x47
+			     || sense->add_sense_code == 0x48))
 				do_fallback = 1;
-			} else {
-				struct scsi_sense_data *sense;
-				
-				sense = (struct scsi_sense_data *)
-					cmd->sense_buffer;
-				if (sense->extra_len >= 5 &&
-				    (sense->add_sense_code == 0x47
-				     || sense->add_sense_code == 0x48))
-					do_fallback = 1;
-			}
 			break;
 		default:
 			break;

drivers/scsi/aic7xxx/aic7xxx_osm.c

···
 			if (sense_size < SCSI_SENSE_BUFFERSIZE)
 				memset(&cmd->sense_buffer[sense_size], 0,
 				       SCSI_SENSE_BUFFERSIZE - sense_size);
-			cmd->result |= (DRIVER_SENSE << 24);
 #ifdef AHC_DEBUG
 			if (ahc_debug & AHC_SHOW_SENSE) {
 				int i;

drivers/scsi/arcmsr/arcmsr_hba.c

···
 		memcpy(sensebuffer, ccb->arcmsr_cdb.SenseData, sense_data_length);
 		sensebuffer->ErrorCode = SCSI_SENSE_CURRENT_ERRORS;
 		sensebuffer->Valid = 1;
-		pcmd->result |= (DRIVER_SENSE << 24);
 	}
 }
 

drivers/scsi/ch.c

···
 				  MAX_RETRIES, NULL);
 	if (result < 0)
 		return result;
-	if (driver_byte(result) == DRIVER_SENSE) {
+	if (scsi_sense_valid(&sshdr)) {
 		if (debug)
 			scsi_print_sense_hdr(ch->device, ch->name, &sshdr);
 		errno = ch_find_errno(&sshdr);

drivers/scsi/cxlflash/superpipe.c

···
 		goto out;
 	}
 
-	if (result > 0 && driver_byte(result) == DRIVER_SENSE) {
-		result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
+	if (result > 0 && scsi_sense_valid(&sshdr)) {
 		if (result & SAM_STAT_CHECK_CONDITION) {
 			switch (sshdr.sense_key) {
 			case NO_SENSE:

drivers/scsi/dc395x.c

···
 		}
 		dprintkdbg(DBG_0, "srb_done: AUTO_REQSENSE2\n");
 
-		if (srb->total_xfer_length
-		    && srb->total_xfer_length >= cmd->underflow)
-			cmd->result =
-			    MK_RES_LNX(DRIVER_SENSE, DID_OK,
-				       srb->end_message, CHECK_CONDITION);
-		/*SET_RES_DID(cmd->result,DID_OK) */
-		else
-			cmd->result =
-			    MK_RES_LNX(DRIVER_SENSE, DID_OK,
-				       srb->end_message, CHECK_CONDITION);
+		cmd->result =
+		    MK_RES(0, DID_OK,
+			   srb->end_message, SAM_STAT_CHECK_CONDITION);
 
 		goto ckc_e;
 	}

drivers/scsi/esp_scsi.c

···
 		 * saw originally.  Also, report that we are providing
 		 * the sense data.
 		 */
-		cmd->result = ((DRIVER_SENSE << 24) |
-			       (DID_OK << 16) |
-			       (SAM_STAT_CHECK_CONDITION << 0));
+		cmd->result = SAM_STAT_CHECK_CONDITION;
 
 		ent->flags &= ~ESP_CMD_FLAG_AUTOSENSE;
 		if (esp_debug & ESP_DEBUG_AUTOSENSE) {

drivers/scsi/megaraid.c

···
 				memcpy(cmd->sense_buffer, pthru->reqsensearea,
 						14);
 
-				cmd->result = (DRIVER_SENSE << 24) |
-					(DID_OK << 16) |
-					(CHECK_CONDITION << 1);
+				cmd->result = SAM_STAT_CHECK_CONDITION;
 			}
 			else {
 				if (mbox->m_out.cmd == MEGA_MBOXCMD_EXTPTHRU) {
···
 					memcpy(cmd->sense_buffer,
 						epthru->reqsensearea, 14);
 
-					cmd->result = (DRIVER_SENSE << 24) |
-						(DID_OK << 16) |
-						(CHECK_CONDITION << 1);
+					cmd->result = SAM_STAT_CHECK_CONDITION;
 				} else
 					scsi_build_sense(cmd, 0,
 							 ABORTED_COMMAND, 0, 0);

drivers/scsi/megaraid/megaraid_mbox.c

···
 				memcpy(scp->sense_buffer, pthru->reqsensearea,
 						14);
 
-				scp->result = DRIVER_SENSE << 24 |
-					DID_OK << 16 | CHECK_CONDITION << 1;
+				scp->result = SAM_STAT_CHECK_CONDITION;
 			}
 			else {
 				if (mbox->cmd == MBOXCMD_EXTPTHRU) {
···
 					memcpy(scp->sense_buffer,
 						epthru->reqsensearea, 14);
 
-					scp->result = DRIVER_SENSE << 24 |
-						DID_OK << 16 |
-						CHECK_CONDITION << 1;
+					scp->result = SAM_STAT_CHECK_CONDITION;
 				} else
 					scsi_build_sense(scp, 0,
 							 ABORTED_COMMAND, 0, 0);

drivers/scsi/megaraid/megaraid_sas_base.c

···
 				       SCSI_SENSE_BUFFERSIZE);
 				memcpy(cmd->scmd->sense_buffer, cmd->sense,
 				       hdr->sense_len);
-
-				cmd->scmd->result |= DRIVER_SENSE << 24;
 			}
 
 			break;

drivers/scsi/megaraid/megaraid_sas_fusion.c

···
 			       SCSI_SENSE_BUFFERSIZE);
 			memcpy(scmd->sense_buffer, sense,
 			       SCSI_SENSE_BUFFERSIZE);
-			scmd->result |= DRIVER_SENSE << 24;
 		}
 
 		/*

drivers/scsi/mvumi.c

···
 		if (ob_frame->rsp_flag & CL_RSP_FLAG_SENSEDATA) {
 			memcpy(cmd->scmd->sense_buffer, ob_frame->payload,
 				sizeof(struct mvumi_sense_data));
-			scmd->result |=  (DRIVER_SENSE << 24);
 		}
 		break;
 	default:

drivers/scsi/scsi.c

···
 	if (atomic_read(&sdev->device_blocked))
 		atomic_set(&sdev->device_blocked, 0);
 
-	/*
-	 * If we have valid sense information, then some kind of recovery
-	 * must have taken place.  Make a note of this.
-	 */
-	if (SCSI_SENSE_VALID(cmd))
-		cmd->result |= (DRIVER_SENSE << 24);
-
 	SCSI_LOG_MLCOMPLETE(4, sdev_printk(KERN_INFO, sdev,
 				"Notifying upper driver of completion "
 				"(result %x)\n", cmd->result));

drivers/scsi/scsi_debug.c

···
 };
 
 static const int check_condition_result =
-		(DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
+	SAM_STAT_CHECK_CONDITION;
 
 static const int illegal_condition_result =
-	(DRIVER_SENSE << 24) | (DID_ABORT << 16) | SAM_STAT_CHECK_CONDITION;
+	(DID_ABORT << 16) | SAM_STAT_CHECK_CONDITION;
 
 static const int device_qfull_result =
 	(DID_OK << 16) | SAM_STAT_TASK_SET_FULL;

drivers/scsi/scsi_ioctl.c

···
 
 	if (result < 0)
 		goto out;
-	if (driver_byte(result) == DRIVER_SENSE &&
-	    scsi_sense_valid(&sshdr)) {
+	if (scsi_sense_valid(&sshdr)) {
 		switch (sshdr.sense_key) {
 		case ILLEGAL_REQUEST:
 			if (cmd[0] == ALLOW_MEDIUM_REMOVAL)

drivers/scsi/scsi_lib.c

···
 	case DID_OK:
 		/*
 		 * Also check the other bytes than the status byte in result
-		 * to handle the case when a SCSI LLD sets result to
-		 * DRIVER_SENSE << 24 without setting SAM_STAT_CHECK_CONDITION.
 		 */
 		if (scsi_status_is_good(result) && (result & ~0xff) == 0)
 			return BLK_STS_OK;
···
 			 */
 			if (!level && __ratelimit(&_rs)) {
 				scsi_print_result(cmd, NULL, FAILED);
-				if (driver_byte(result) == DRIVER_SENSE)
+				if (sense_valid)
 					scsi_print_sense(cmd);
 				scsi_print_command(cmd);
 			}
···
 	 * ILLEGAL REQUEST if the code page isn't supported */
 
 	if (!scsi_status_is_good(result)) {
-		if (driver_byte(result) == DRIVER_SENSE &&
-		    scsi_sense_valid(sshdr)) {
+		if (scsi_sense_valid(sshdr)) {
 			if ((sshdr->sense_key == ILLEGAL_REQUEST) &&
 			    (sshdr->asc == 0x20) && (sshdr->ascq == 0)) {
 				/*
···
 void scsi_build_sense(struct scsi_cmnd *scmd, int desc, u8 key, u8 asc, u8 ascq)
 {
 	scsi_build_sense_buffer(desc, scmd->sense_buffer, key, asc, ascq);
-	scmd->result = (DRIVER_SENSE << 24) | (DID_OK << 16) |
-		SAM_STAT_CHECK_CONDITION;
+	scmd->result = SAM_STAT_CHECK_CONDITION;
 }
 EXPORT_SYMBOL_GPL(scsi_build_sense);

drivers/scsi/scsi_scan.c

···
 			 * INQUIRY should not yield UNIT_ATTENTION
 			 * but many buggy devices do so anyway. 
 			 */
-			if (driver_byte(result) == DRIVER_SENSE &&
+			if (scsi_status_is_check_condition(result) &&
 			    scsi_sense_valid(&sshdr)) {
 				if ((sshdr.sense_key == UNIT_ATTENTION) &&
 				    ((sshdr.asc == 0x28) ||

drivers/scsi/scsi_transport_spi.c

···
 				      REQ_FAILFAST_TRANSPORT |
 				      REQ_FAILFAST_DRIVER,
 				      RQF_PM, NULL);
-		if (result < 0 || driver_byte(result) != DRIVER_SENSE ||
+		if (result < 0 || !scsi_sense_valid(sshdr) ||
 		    sshdr->sense_key != UNIT_ATTENTION)
 			break;
 	}

drivers/scsi/sd.c

···
 		if (res < 0)
 			return res;
 
-		if (driver_byte(res) == DRIVER_SENSE)
+		if (scsi_status_is_check_condition(res) &&
+		    scsi_sense_valid(sshdr)) {
 			sd_print_sense_hdr(sdkp, sshdr);
 
-		/* we need to evaluate the error return  */
-		if (scsi_sense_valid(sshdr) &&
-			(sshdr->asc == 0x3a ||	/* medium not present */
-			 sshdr->asc == 0x20 ||	/* invalid command */
-			 (sshdr->asc == 0x74 && sshdr->ascq == 0x71)))	/* drive is password locked */
+			/* we need to evaluate the error return  */
+			if (sshdr->asc == 0x3a ||	/* medium not present */
+			    sshdr->asc == 0x20 ||	/* invalid command */
+			    (sshdr->asc == 0x74 && sshdr->ascq == 0x71))	/* drive is password locked */
 				/* this is no error here */
 				return 0;
+		}
 
 		switch (host_byte(res)) {
 		/* ignore errors due to racing a disconnection */
···
 	result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
 			&sshdr, SD_TIMEOUT, sdkp->max_retries, NULL);
 
-	if (result > 0 && driver_byte(result) == DRIVER_SENSE &&
+	if (scsi_status_is_check_condition(result) &&
 	    scsi_sense_valid(&sshdr)) {
 		sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
 		scsi_print_sense_hdr(sdev, NULL, &sshdr);
···
 	}
 	sdkp->medium_access_timed_out = 0;
 
-	if (driver_byte(result) != DRIVER_SENSE &&
+	if (!scsi_status_is_check_condition(result) &&
 	    (!sense_valid || sense_deferred))
 		goto out;
 
···
 			if (the_result)
 				sense_valid = scsi_sense_valid(&sshdr);
 			retries++;
-		} while (retries < 3 && 
+		} while (retries < 3 &&
 			 (!scsi_status_is_good(the_result) ||
-			  ((driver_byte(the_result) == DRIVER_SENSE) &&
+			  (scsi_status_is_check_condition(the_result) &&
 			  sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
 
-		if (the_result < 0 || driver_byte(the_result) != DRIVER_SENSE) {
+		if (!scsi_status_is_check_condition(the_result)) {
 			/* no sense, TUR either succeeded or failed
 			 * with a status error */
 			if(!spintime && !scsi_status_is_good(the_result)) {
···
 			struct scsi_sense_hdr *sshdr, int sense_valid,
 			int the_result)
 {
-	if (driver_byte(the_result) == DRIVER_SENSE)
+	if (sense_valid)
 		sd_print_sense_hdr(sdkp, sshdr);
 	else
 		sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
···
 			SD_TIMEOUT, sdkp->max_retries, 0, RQF_PM, NULL);
 	if (res) {
 		sd_print_result(sdkp, "Start/Stop Unit failed", res);
-		if (res > 0 && driver_byte(res) == DRIVER_SENSE)
+		if (res > 0 && scsi_sense_valid(&sshdr)) {
 			sd_print_sense_hdr(sdkp, &sshdr);
-		if (scsi_sense_valid(&sshdr) &&
 			/* 0x3a is medium not present */
-			sshdr.asc == 0x3a)
-			res = 0;
+			if (sshdr.asc == 0x3a)
+				res = 0;
+		}
 	}
 
 	/* SCSI error codes must not go to the generic layer */

drivers/scsi/sd_zbc.c

···
 		sd_printk(KERN_ERR, sdkp,
 			  "REPORT ZONES start lba %llu failed\n", lba);
 		sd_print_result(sdkp, "REPORT ZONES", result);
-		if (result > 0 && driver_byte(result) == DRIVER_SENSE &&
-		    scsi_sense_valid(&sshdr))
+		if (result > 0 && scsi_sense_valid(&sshdr))
 			sd_print_sense_hdr(sdkp, &sshdr);
 		return -EIO;
 	}

drivers/scsi/sg.c

···
 	old_hdr->host_status = hp->host_status;
 	old_hdr->driver_status = hp->driver_status;
 	if ((CHECK_CONDITION & hp->masked_status) ||
-	    (DRIVER_SENSE & hp->driver_status))
+	    (srp->sense_b[0] & 0x70) == 0x70) {
+		old_hdr->driver_status = DRIVER_SENSE;
 		memcpy(old_hdr->sense_buffer, srp->sense_b,
 		       sizeof (old_hdr->sense_buffer));
+	}
 	switch (hp->host_status) {
 	/* This setup of 'result' is for backward compatibility and is best
 	   ignored by the user who should use target, host + driver status */
···
 	hp->sb_len_wr = 0;
 	if ((hp->mx_sb_len > 0) && hp->sbp) {
 		if ((CHECK_CONDITION & hp->masked_status) ||
-		    (DRIVER_SENSE & hp->driver_status)) {
+		    (srp->sense_b[0] & 0x70) == 0x70) {
 			int sb_len = SCSI_SENSE_BUFFERSIZE;
 			sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
 			len = 8 + (int) srp->sense_b[7];	/* Additional sense length field */
···
 				err = -EFAULT;
 				goto err_out;
 			}
+			hp->driver_status = DRIVER_SENSE;
 			hp->sb_len_wr = len;
 		}
 	}

drivers/scsi/stex.c

···
 			result |= DID_OK << 16;
 			break;
 		case SAM_STAT_CHECK_CONDITION:
-			result |= DRIVER_SENSE << 24;
+			result |= DID_OK << 16;
 			break;
 		case SAM_STAT_BUSY:
 			result |= DID_BUS_BUSY << 16;
···
 		}
 	}
 	else if (ccb->srb_status & SRB_SEE_SENSE)
-		result = DRIVER_SENSE << 24 | SAM_STAT_CHECK_CONDITION;
+		result = SAM_STAT_CHECK_CONDITION;
 	else switch (ccb->srb_status) {
 		case SRB_STATUS_SELECTION_TIMEOUT:
 			result = DID_NO_CONNECT << 16;

drivers/scsi/sym53c8xx_2/sym_glue.c

···
 void sym_set_cam_result_error(struct sym_hcb *np, struct sym_ccb *cp, int resid)
 {
 	struct scsi_cmnd *cmd = cp->cmd;
-	u_int cam_status, scsi_status, drv_status;
+	u_int cam_status, scsi_status;
 
-	drv_status  = 0;
 	cam_status  = DID_OK;
 	scsi_status = cp->ssss_status;
 
···
 		    cp->xerr_status == 0) {
 			cam_status = sym_xerr_cam_status(DID_OK,
 							 cp->sv_xerr_status);
-			drv_status = DRIVER_SENSE;
 			/*
 			 *  Bounce back the sense data to user.
 			 */
···
 		cam_status = sym_xerr_cam_status(DID_ERROR, cp->xerr_status);
 	}
 	scsi_set_resid(cmd, resid);
-	cmd->result = (drv_status << 24) | (cam_status << 16) | scsi_status;
+	cmd->result = (cam_status << 16) | scsi_status;
 }
 
 static int sym_scatter(struct sym_hcb *np, struct sym_ccb *cp, struct scsi_cmnd *cmd)

drivers/scsi/ufs/ufshcd.c

···
 		sdev_printk(KERN_WARNING, sdp,
 			    "START_STOP failed for power mode: %d, result %x\n",
 			    pwr_mode, ret);
-		if (ret > 0 && driver_byte(ret) == DRIVER_SENSE)
+		if (ret > 0 && scsi_sense_valid(&sshdr))
 			scsi_print_sense_hdr(sdp, NULL, &sshdr);
 	}
 

drivers/scsi/virtio_scsi.c

···
 		       min_t(u32,
 			     virtio32_to_cpu(vscsi->vdev, resp->sense_len),
 			     VIRTIO_SCSI_SENSE_SIZE));
-		if (resp->sense_len)
-			set_driver_byte(sc, DRIVER_SENSE);
+		set_status_byte(sc, SAM_STAT_CHECK_CONDITION);
 	}
 
 	sc->scsi_done(sc);

drivers/scsi/vmw_pvscsi.c

···
 			cmd->result = (DID_RESET << 16);
 		} else {
 			cmd->result = (DID_OK << 16) | sdstat;
-			if (sdstat == SAM_STAT_CHECK_CONDITION &&
-			    cmd->sense_buffer)
-				cmd->result |= (DRIVER_SENSE << 24);
 		}
 	} else
 		switch (btstat) {

drivers/target/loopback/tcm_loop.c

···
 		memcpy(sc->sense_buffer, se_cmd->sense_buffer,
 				SCSI_SENSE_BUFFERSIZE);
 		sc->result = SAM_STAT_CHECK_CONDITION;
-		set_driver_byte(sc, DRIVER_SENSE);
 	} else
 		sc->result = scsi_status;
 

drivers/usb/storage/cypress_atacb.c

···
 		desc[12] = regs[6];  /* device */
 		desc[13] = regs[7];  /* command */
 
-		srb->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
+		srb->result = SAM_STAT_CHECK_CONDITION;
 	}
 	goto end;
 invalid_fld:
-	srb->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
+	srb->result = SAM_STAT_CHECK_CONDITION;
 
 	memcpy(srb->sense_buffer,
 			usb_stor_sense_invalidCDB,

drivers/xen/xen-scsiback.c

···
 	if (se_cmd->sense_buffer &&
 	    ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
 	     (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE)))
-		pending_req->result = (DRIVER_SENSE << 24) |
-				      SAM_STAT_CHECK_CONDITION;
+		pending_req->result = SAM_STAT_CHECK_CONDITION;
 	else
 		pending_req->result = se_cmd->scsi_status;
 

include/scsi/sg.h

···
 #define SG_INFO_DIRECT_IO 0x2   /* direct IO requested and performed */
 #define SG_INFO_MIXED_IO 0x4    /* part direct, part indirect IO */
 
+/*
+ * Obsolete DRIVER_SENSE driver byte
+ *
+ * Originally the SCSI midlayer would set the DRIVER_SENSE driver byte when
+ * a sense code was generated and a sense buffer was allocated.
+ * However, as nowadays every scsi command has a sense code allocated this
+ * distinction became moot as one could check the sense buffer directly.
+ * Consequently this byte is not set anymore from the midlayer, but SG will
+ * keep setting this byte to be compatible with previous releases.
+ */
+#define DRIVER_SENSE 0x08
 
 typedef struct sg_scsi_id { /* used by SG_GET_SCSI_ID ioctl() */
     int host_no;        /* as in "scsi<n>" where 'n' is one of 0, 1, 2 etc */