Merge branch 'for-linus' of git://git.kernel.dk/linux-block

Pull block layer fixes from Jens Axboe:
 "A small collection of fixes for the current kernel.  This contains:

   - Two error handling fixes from Jan Kara.  One for null_blk on
     failure to add a device, and the other for the block/scsi_ioctl
     SCSI_IOCTL_SEND_COMMAND fixing up the error jump point.

   - A commit added in the merge window for the bio integrity bits
     unfortunately disabled merging for all requests if
     CONFIG_BLK_DEV_INTEGRITY wasn't set.  Reverse the logic, so that
     integrity checking wont disallow merges when not enabled.

   - A fix from Ming Lei for merging and generating too many segments.
     This caused a BUG in virtio_blk.

   - Two error handling printk() fixups from Robert Elliott, improving
     the information given when we rate limit.

   - Error handling fixup on elevator_init() failure from Sudip
     Mukherjee.

   - A fix from Tony Battersby, fixing up a memory leak in the
     scatterlist handling with scsi-mq"

* 'for-linus' of git://git.kernel.dk/linux-block:
  block: Fix merge logic when CONFIG_BLK_DEV_INTEGRITY is not defined
  lib/scatterlist: fix memory leak with scsi-mq
  block: fix wrong error return in elevator_init()
  scsi: Fix error handling in SCSI_IOCTL_SEND_COMMAND
  null_blk: Cleanup error recovery in null_add_dev()
  blk-merge: recaculate segment if it isn't less than max segments
  fs: clarify rate limit suppressed buffer I/O errors
  fs: merge I/O error prints into one line

7 files changed, 28 insertions, 46 deletions

diff --git a/block/blk-merge.c b/block/blk-merge.c
index ba99351c0f58..b3ac40aef46b 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -99,16 +99,17 @@ void blk_recount_segments(struct request_queue *q, struct bio *bio)
 {
 	bool no_sg_merge = !!test_bit(QUEUE_FLAG_NO_SG_MERGE,
 			&q->queue_flags);
+	bool merge_not_need = bio->bi_vcnt < queue_max_segments(q);
 
 	if (no_sg_merge && !bio_flagged(bio, BIO_CLONED) &&
-			bio->bi_vcnt < queue_max_segments(q))
+			merge_not_need)
 		bio->bi_phys_segments = bio->bi_vcnt;
 	else {
 		struct bio *nxt = bio->bi_next;
 
 		bio->bi_next = NULL;
 		bio->bi_phys_segments = __blk_recalc_rq_segments(q, bio,
-				no_sg_merge);
+				no_sg_merge && merge_not_need);
 		bio->bi_next = nxt;
 	}
 
diff --git a/block/elevator.c b/block/elevator.c
index 24c28b659bb3..afa3b037a17c 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -229,7 +229,9 @@ int elevator_init(struct request_queue *q, char *name)
 	}
 
 	err = e->ops.elevator_init_fn(q, e);
-	return 0;
+	if (err)
+		elevator_put(e);
+	return err;
 }
 EXPORT_SYMBOL(elevator_init);
 
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index abb2e65b24cc..1e053d911240 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -508,7 +508,7 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 
 	if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
 		err = DRIVER_ERROR << 24;
-		goto out;
+		goto error;
 	}
 
 	memset(sense, 0, sizeof(sense));
@@ -517,7 +517,6 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 
 	blk_execute_rq(q, disk, rq, 0);
 
-out:
 	err = rq->errors & 0xff;	/* only 8 bit SCSI status */
 	if (err) {
 		if (rq->sense_len && rq->sense) {
diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
index 2671a3f02f0c..8001e812018b 100644
--- a/drivers/block/null_blk.c
+++ b/drivers/block/null_blk.c
@@ -450,14 +450,10 @@ static int init_driver_queues(struct nullb *nullb)
 
 		ret = setup_commands(nq);
 		if (ret)
-			goto err_queue;
+			return ret;
 		nullb->nr_queues++;
 	}
-
 	return 0;
-err_queue:
-	cleanup_queues(nullb);
-	return ret;
 }
 
 static int null_add_dev(void)
@@ -507,7 +503,9 @@ static int null_add_dev(void)
 			goto out_cleanup_queues;
 		}
 		blk_queue_make_request(nullb->q, null_queue_bio);
-		init_driver_queues(nullb);
+		rv = init_driver_queues(nullb);
+		if (rv)
+			goto out_cleanup_blk_queue;
 	} else {
 		nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock, home_node);
 		if (!nullb->q) {
@@ -516,7 +514,9 @@ static int null_add_dev(void)
 		}
 		blk_queue_prep_rq(nullb->q, null_rq_prep_fn);
 		blk_queue_softirq_done(nullb->q, null_softirq_done_fn);
-		init_driver_queues(nullb);
+		rv = init_driver_queues(nullb);
+		if (rv)
+			goto out_cleanup_blk_queue;
 	}
 
 	nullb->q->queuedata = nullb;
diff --git a/fs/buffer.c b/fs/buffer.c
index 6c48f20eddd4..20805db2c987 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -128,21 +128,15 @@ __clear_page_buffers(struct page *page)
 	page_cache_release(page);
 }
 
-
-static int quiet_error(struct buffer_head *bh)
-{
-	if (!test_bit(BH_Quiet, &bh->b_state) && printk_ratelimit())
-		return 0;
-	return 1;
-}
-
-
-static void buffer_io_error(struct buffer_head *bh)
+static void buffer_io_error(struct buffer_head *bh, char *msg)
 {
 	char b[BDEVNAME_SIZE];
-	printk(KERN_ERR "Buffer I/O error on device %s, logical block %Lu\n",
+
+	if (!test_bit(BH_Quiet, &bh->b_state))
+		printk_ratelimited(KERN_ERR
+			"Buffer I/O error on dev %s, logical block %llu%s\n",
 			bdevname(bh->b_bdev, b),
-			(unsigned long long)bh->b_blocknr);
+			(unsigned long long)bh->b_blocknr, msg);
 }
 
 /*
@@ -177,17 +171,10 @@ EXPORT_SYMBOL(end_buffer_read_sync);
 
 void end_buffer_write_sync(struct buffer_head *bh, int uptodate)
 {
-	char b[BDEVNAME_SIZE];
-
 	if (uptodate) {
 		set_buffer_uptodate(bh);
 	} else {
-		if (!quiet_error(bh)) {
-			buffer_io_error(bh);
-			printk(KERN_WARNING "lost page write due to "
-					"I/O error on %s\n",
-				       bdevname(bh->b_bdev, b));
-		}
+		buffer_io_error(bh, ", lost sync page write");
 		set_buffer_write_io_error(bh);
 		clear_buffer_uptodate(bh);
 	}
@@ -304,8 +291,7 @@ static void end_buffer_async_read(struct buffer_head *bh, int uptodate)
 		set_buffer_uptodate(bh);
 	} else {
 		clear_buffer_uptodate(bh);
-		if (!quiet_error(bh))
-			buffer_io_error(bh);
+		buffer_io_error(bh, ", async page read");
 		SetPageError(page);
 	}
 
@@ -353,7 +339,6 @@ still_busy:
  */
 void end_buffer_async_write(struct buffer_head *bh, int uptodate)
 {
-	char b[BDEVNAME_SIZE];
 	unsigned long flags;
 	struct buffer_head *first;
 	struct buffer_head *tmp;
@@ -365,12 +350,7 @@ void end_buffer_async_write(struct buffer_head *bh, int uptodate)
 	if (uptodate) {
 		set_buffer_uptodate(bh);
 	} else {
-		if (!quiet_error(bh)) {
-			buffer_io_error(bh);
-			printk(KERN_WARNING "lost page write due to "
-					"I/O error on %s\n",
-			       bdevname(bh->b_bdev, b));
-		}
+		buffer_io_error(bh, ", lost async page write");
 		set_bit(AS_EIO, &page->mapping->flags);
 		set_buffer_write_io_error(bh);
 		clear_buffer_uptodate(bh);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 0207a78a8d82..6cbee8395f60 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1583,13 +1583,13 @@ static inline bool blk_integrity_merge_rq(struct request_queue *rq,
 					  struct request *r1,
 					  struct request *r2)
 {
-	return 0;
+	return true;
 }
 static inline bool blk_integrity_merge_bio(struct request_queue *rq,
 					   struct request *r,
 					   struct bio *b)
 {
-	return 0;
+	return true;
 }
 static inline bool blk_integrity_is_initialized(struct gendisk *g)
 {
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index 9cdf62f8accd..c9f2e8c6ccc9 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -203,10 +203,10 @@ void __sg_free_table(struct sg_table *table, unsigned int max_ents,
 		}
 
 		table->orig_nents -= sg_size;
-		if (!skip_first_chunk) {
-			free_fn(sgl, alloc_size);
+		if (skip_first_chunk)
 			skip_first_chunk = false;
-		}
+		else
+			free_fn(sgl, alloc_size);
 		sgl = next;
 	}