[PATCH] Undo SCSI 8-byte alignment relaxation

This makes the default alignment requirements be 512 bytes for SCSI,
the way it used to be.

Jens will fix the SCSI layer problems, but low-level drivers might have
other restrictions on alignment.

drivers/scsi/scsi_lib.c

@@ -1285,15 +1285,6 @@ struct request_queue *scsi_alloc_queue(struct scsi_device *sdev)
 	blk_queue_bounce_limit(q, scsi_calculate_bounce_limit(shost));
 	blk_queue_segment_boundary(q, shost->dma_boundary);
  
-	/*
-	 * Set the queue's mask to require a mere 8-byte alignment for
-	 * DMA buffers, rather than the default 512.  This shouldn't
-	 * inconvenience any user programs and should be okay for most
-	 * host adapters.  A host driver can alter this mask in its
-	 * slave_alloc() or slave_configure() callback if necessary.
-	 */
-	blk_queue_dma_alignment(q, (8 - 1));
-
 	if (!shost->use_clustering)
 		clear_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);
 	return q;