diff --git a/block/blk-merge.c b/block/blk-merge.c
index a104593e70c38cdfdaebc1cf1214934e37ce3284..5a244f05360f5ca67592e29a7270f3874bf16c37 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -39,14 +39,13 @@ void blk_recalc_rq_sectors(struct request *rq, int nsect)
 }
 
 static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
-					     struct bio *bio,
-					     unsigned int *seg_size_ptr)
+					     struct bio *bio)
 {
 	unsigned int phys_size;
 	struct bio_vec *bv, *bvprv = NULL;
 	int cluster, i, high, highprv = 1;
 	unsigned int seg_size, nr_phys_segs;
-	struct bio *fbio;
+	struct bio *fbio, *bbio;
 
 	if (!bio)
 		return 0;
@@ -87,26 +86,20 @@ static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
 			seg_size = bv->bv_len;
 			highprv = high;
 		}
+		bbio = bio;
 	}
 
-	if (seg_size_ptr)
-		*seg_size_ptr = seg_size;
+	if (nr_phys_segs == 1 && seg_size > fbio->bi_seg_front_size)
+		fbio->bi_seg_front_size = seg_size;
+	if (seg_size > bbio->bi_seg_back_size)
+		bbio->bi_seg_back_size = seg_size;
 
 	return nr_phys_segs;
 }
 
 void blk_recalc_rq_segments(struct request *rq)
 {
-	unsigned int seg_size = 0, phys_segs;
-
-	phys_segs = __blk_recalc_rq_segments(rq->q, rq->bio, &seg_size);
-
-	if (phys_segs == 1 && seg_size > rq->bio->bi_seg_front_size)
-		rq->bio->bi_seg_front_size = seg_size;
-	if (seg_size > rq->biotail->bi_seg_back_size)
-		rq->biotail->bi_seg_back_size = seg_size;
-
-	rq->nr_phys_segments = phys_segs;
+	rq->nr_phys_segments = __blk_recalc_rq_segments(rq->q, rq->bio);
 }
 
 void blk_recount_segments(struct request_queue *q, struct bio *bio)
@@ -114,7 +107,7 @@ void blk_recount_segments(struct request_queue *q, struct bio *bio)
 	struct bio *nxt = bio->bi_next;
 
 	bio->bi_next = NULL;
-	bio->bi_phys_segments = __blk_recalc_rq_segments(q, bio, NULL);
+	bio->bi_phys_segments = __blk_recalc_rq_segments(q, bio);
 	bio->bi_next = nxt;
 	bio->bi_flags |= (1 << BIO_SEG_VALID);
 }
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index b5a06111463018b5d93f3d2b944caf9c60654281..4f9b6d7920173d19f85dc0cb822c3e33d87b1db9 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -3606,11 +3606,9 @@ static int __devinit cciss_init_one(struct pci_dev *pdev,
 		if (cciss_hard_reset_controller(pdev) || cciss_reset_msi(pdev))
 			return -ENODEV;
 
-		/* Some devices (notably the HP Smart Array 5i Controller)
-		   need a little pause here */
-		schedule_timeout_uninterruptible(30*HZ);
-
-		/* Now try to get the controller to respond to a no-op */
+		/* Now try to get the controller to respond to a no-op. Some
+		   devices (notably the HP Smart Array 5i Controller) need
+		   up to 30 seconds to respond. */
 		for (i=0; i<30; i++) {
 			if (cciss_noop(pdev) == 0)
 				break;
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index edbaac6c05739ab183e69f94c1dc230acea27176..bf034557767243ecbb0fd3c56538f7877e222345 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -392,8 +392,7 @@ lo_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
 	struct loop_device *lo = p->lo;
 	struct page *page = buf->page;
 	sector_t IV;
-	size_t size;
-	int ret;
+	int size, ret;
 
 	ret = buf->ops->confirm(pipe, buf);
 	if (unlikely(ret))
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index b6c8ce25435994558885e9e4b9c4ac6aafaa9357..8f905089b72b7e49c2434d1b6abba9fa76321051 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -977,6 +977,8 @@ static void backend_changed(struct xenbus_device *dev,
 		break;
 
 	case XenbusStateClosing:
+		if (info->gd == NULL)
+			xenbus_dev_fatal(dev, -ENODEV, "gd is NULL");
 		bd = bdget_disk(info->gd, 0);
 		if (bd == NULL)
 			xenbus_dev_fatal(dev, -ENODEV, "bdget failed");