Merge commit 'v2.6.39' into for-2.6.40/core

Since for-2.6.40/core was forked off the 2.6.39 devel tree, we've
had churn in the core area that makes it difficult to handle
patches for eg cfq or blk-throttle. Instead of requiring that they
be based in older versions with bugs that have been fixed later
in the rc cycle, merge in 2.6.39 final.

Also fixes up conflicts in the below files.

Conflicts:
	drivers/block/paride/pcd.c
	drivers/cdrom/viocd.c
	drivers/ide/ide-cd.c

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 32 insertions, 19 deletions

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 4d2df2f76ea..86b6f1cc1b1 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -1742,11 +1742,20 @@ int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
 static inline int _dasd_term_running_cqr(struct dasd_device *device)
 {
 	struct dasd_ccw_req *cqr;
+	int rc;
 
 	if (list_empty(&device->ccw_queue))
 		return 0;
 	cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
-	return device->discipline->term_IO(cqr);
+	rc = device->discipline->term_IO(cqr);
+	if (!rc)
+		/*
+		 * CQR terminated because a more important request is pending.
+		 * Undo decreasing of retry counter because this is
+		 * not an error case.
+		 */
+		cqr->retries++;
+	return rc;
 }
 
 int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
@@ -2314,15 +2323,14 @@ static void dasd_flush_request_queue(struct dasd_block *block)
 
 static int dasd_open(struct block_device *bdev, fmode_t mode)
 {
-	struct dasd_block *block = bdev->bd_disk->private_data;
 	struct dasd_device *base;
 	int rc;
 
-	if (!block)
+	base = dasd_device_from_gendisk(bdev->bd_disk);
+	if (!base)
 		return -ENODEV;
 
-	base = block->base;
-	atomic_inc(&block->open_count);
+	atomic_inc(&base->block->open_count);
 	if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
 		rc = -ENODEV;
 		goto unlock;
@@ -2355,21 +2363,28 @@ static int dasd_open(struct block_device *bdev, fmode_t mode)
 		goto out;
 	}
 
+	dasd_put_device(base);
 	return 0;
 
 out:
 	module_put(base->discipline->owner);
 unlock:
-	atomic_dec(&block->open_count);
+	atomic_dec(&base->block->open_count);
+	dasd_put_device(base);
 	return rc;
 }
 
 static int dasd_release(struct gendisk *disk, fmode_t mode)
 {
-	struct dasd_block *block = disk->private_data;
+	struct dasd_device *base;
 
-	atomic_dec(&block->open_count);
-	module_put(block->base->discipline->owner);
+	base = dasd_device_from_gendisk(disk);
+	if (!base)
+		return -ENODEV;
+
+	atomic_dec(&base->block->open_count);
+	module_put(base->discipline->owner);
+	dasd_put_device(base);
 	return 0;
 }
 
@@ -2378,20 +2393,20 @@ static int dasd_release(struct gendisk *disk, fmode_t mode)
  */
 static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 {
-	struct dasd_block *block;
 	struct dasd_device *base;
 
-	block = bdev->bd_disk->private_data;
-	if (!block)
+	base = dasd_device_from_gendisk(bdev->bd_disk);
+	if (!base)
 		return -ENODEV;
-	base = block->base;
 
 	if (!base->discipline ||
-	    !base->discipline->fill_geometry)
+	    !base->discipline->fill_geometry) {
+		dasd_put_device(base);
 		return -EINVAL;
-
-	base->discipline->fill_geometry(block, geo);
-	geo->start = get_start_sect(bdev) >> block->s2b_shift;
+	}
+	base->discipline->fill_geometry(base->block, geo);
+	geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
+	dasd_put_device(base);
 	return 0;
 }
 
@@ -2528,7 +2543,6 @@ void dasd_generic_remove(struct ccw_device *cdev)
 	dasd_set_target_state(device, DASD_STATE_NEW);
 	/* dasd_delete_device destroys the device reference. */
 	block = device->block;
-	device->block = NULL;
 	dasd_delete_device(device);
 	/*
 	 * life cycle of block is bound to device, so delete it after
@@ -2650,7 +2664,6 @@ int dasd_generic_set_offline(struct ccw_device *cdev)
 	dasd_set_target_state(device, DASD_STATE_NEW);
 	/* dasd_delete_device destroys the device reference. */
 	block = device->block;
-	device->block = NULL;
 	dasd_delete_device(device);
 	/*
 	 * life cycle of block is bound to device, so delete it after