Revert "scsi: sd: Fix optimal I/O size for devices that change report…

…ed values"

This reverts commit 20b0874.

drivers/scsi/sd.c

@@ -3123,11 +3123,9 @@ static int sd_revalidate_disk(struct gendisk *disk)
 	if (sd_validate_opt_xfer_size(sdkp, dev_max))
 		rw_max = q->limits.io_opt =
 			sdkp->opt_xfer_blocks * sdp->sector_size;
-	} else {
-		q->limits.io_opt = 0;
+	else
 		rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
 				      (sector_t)BLK_DEF_MAX_SECTORS);
-	}
 
 	/* Do not exceed controller limit */
 	rw_max = min(rw_max, queue_max_hw_sectors(q));