ide: BUG() on unknown requests

Unsupported requests should be never handed down to device drivers
and the best thing we can do upon discovering such request inside
driver's ->do_request method is to just BUG().
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-cd.c

@@ -785,12 +785,8 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
 		/* right now this can only be a reset... */
 		uptodate = 1;
 		goto out_end;
-	} else {
-		blk_dump_rq_flags(rq, DRV_NAME " bad flags");
-		if (rq->errors == 0)
-			rq->errors = -EIO;
-		goto out_end;
-	}
+	} else
+		BUG();
 
 	/* prepare sense request for this command */
 	ide_prep_sense(drive, rq);

drivers/ide/ide-disk.c

@@ -184,14 +184,7 @@ static ide_startstop_t ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
 	ide_hwif_t *hwif = drive->hwif;
 
 	BUG_ON(drive->dev_flags & IDE_DFLAG_BLOCKED);
-
-	if (!blk_fs_request(rq)) {
-		blk_dump_rq_flags(rq, "ide_do_rw_disk - bad command");
-		if (rq->errors == 0)
-			rq->errors = -EIO;
-		ide_complete_rq(drive, -EIO, ide_rq_bytes(rq));
-		return ide_stopped;
-	}
+	BUG_ON(!blk_fs_request(rq));
 
 	ledtrig_ide_activity();
 

drivers/ide/ide-floppy.c

@@ -269,10 +269,8 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
 	} else if (blk_pc_request(rq)) {
 		pc = &floppy->queued_pc;
 		idefloppy_blockpc_cmd(floppy, pc, rq);
-	} else {
-		blk_dump_rq_flags(rq, PFX "unsupported command in queue");
-		goto out_end;
-	}
+	} else
+		BUG();
 
 	ide_prep_sense(drive, rq);
 

drivers/ide/ide-tape.c

@@ -586,15 +586,7 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
 	debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %u\n"
 		  (unsigned long long)blk_rq_pos(rq), blk_rq_sectors(rq));
 
-	if (!(blk_special_request(rq) || blk_sense_request(rq))) {
-		/* We do not support buffer cache originated requests. */
-		printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
-			"request queue (%d)\n", drive->name, rq->cmd_type);
-		if (blk_fs_request(rq) == 0 && rq->errors == 0)
-			rq->errors = -EIO;
-		ide_complete_rq(drive, -EIO, ide_rq_bytes(rq));
-		return ide_stopped;
-	}
+	BUG_ON(!(blk_special_request(rq) || blk_sense_request(rq)));
 
 	/* Retry a failed packet command */
 	if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {