[PATCH 7/8] block: pass a request_queue to __blk_alloc_disk

[Christoph Hellwig]

Pass in a request_queue and assign disk->queue in __blk_alloc_disk to
ensure struct gendisk always has a valid ->queue pointer.

Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 block/blk-mq.c                  | 3 +--
 block/genhd.c                   | 7 ++++---
 drivers/s390/block/dasd_genhd.c | 4 ++--
 drivers/scsi/sd.c               | 4 ++--
 drivers/scsi/sr.c               | 4 ++--
 include/linux/genhd.h           | 3 ++-
 6 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index b9021d801f28..9aa208af12fa 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -3143,12 +3143,11 @@ struct gendisk *__blk_mq_alloc_disk(struct blk_mq_tag_set *set, void *queuedata,
 	if (IS_ERR(q))
 		return ERR_CAST(q);
 
-	disk = __alloc_disk_node(set->numa_node, lkclass);
+	disk = __alloc_disk_node(q, set->numa_node, lkclass);
 	if (!disk) {
 		blk_cleanup_queue(q);
 		return ERR_PTR(-ENOMEM);
 	}
-	disk->queue = q;
 	return disk;
 }
 EXPORT_SYMBOL(__blk_mq_alloc_disk);
diff --git a/block/genhd.c b/block/genhd.c
index 395013545137..283cf0c649e1 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1263,7 +1263,8 @@ dev_t blk_lookup_devt(const char *name, int partno)
 	return devt;
 }
 
-struct gendisk *__alloc_disk_node(int node_id, struct lock_class_key *lkclass)
+struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id,
+		struct lock_class_key *lkclass)
 {
 	struct gendisk *disk;
 
@@ -1286,6 +1287,7 @@ struct gendisk *__alloc_disk_node(int node_id, struct lock_class_key *lkclass)
 	disk_to_dev(disk)->type = &disk_type;
 	device_initialize(disk_to_dev(disk));
 	inc_diskseq(disk);
+	disk->queue = q;
 	lockdep_init_map(&disk->lockdep_map, "(bio completion)", lkclass, 0);
 
 	return disk;
@@ -1308,12 +1310,11 @@ struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass)
 	if (!q)
 		return NULL;
 
-	disk = __alloc_disk_node(node, lkclass);
+	disk = __alloc_disk_node(q, node, lkclass);
 	if (!disk) {
 		blk_cleanup_queue(q);
 		return NULL;
 	}
-	disk->queue = q;
 	return disk;
 }
 EXPORT_SYMBOL(__blk_alloc_disk);
diff --git a/drivers/s390/block/dasd_genhd.c b/drivers/s390/block/dasd_genhd.c
index 6e44515b4d33..fa966e0db6ca 100644
--- a/drivers/s390/block/dasd_genhd.c
+++ b/drivers/s390/block/dasd_genhd.c
@@ -40,7 +40,8 @@ int dasd_gendisk_alloc(struct dasd_block *block)
 	if (base->devindex >= DASD_PER_MAJOR)
 		return -EBUSY;
 
-	gdp = __alloc_disk_node(NUMA_NO_NODE, &dasd_bio_compl_lkclass);
+	gdp = __alloc_disk_node(block->request_queue, NUMA_NO_NODE,
+				&dasd_bio_compl_lkclass);
 	if (!gdp)
 		return -ENOMEM;
 
@@ -76,7 +77,6 @@ int dasd_gendisk_alloc(struct dasd_block *block)
 	    test_bit(DASD_FLAG_DEVICE_RO, &base->flags))
 		set_disk_ro(gdp, 1);
 	dasd_add_link_to_gendisk(gdp, base);
-	gdp->queue = block->request_queue;
 	block->gdp = gdp;
 	set_capacity(block->gdp, 0);
 	device_add_disk(&base->cdev->dev, block->gdp, NULL);
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 4e22d1bb6226..93e92dec77ed 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -3409,7 +3409,8 @@ static int sd_probe(struct device *dev)
 	if (!sdkp)
 		goto out;
 
-	gd = __alloc_disk_node(NUMA_NO_NODE, &sd_bio_compl_lkclass);
+	gd = __alloc_disk_node(sdp->request_queue, NUMA_NO_NODE,
+			       &sd_bio_compl_lkclass);
 	if (!gd)
 		goto out_free;
 
@@ -3459,7 +3460,6 @@ static int sd_probe(struct device *dev)
 
 	gd->fops = &sd_fops;
 	gd->private_data = &sdkp->driver;
-	gd->queue = sdkp->device->request_queue;
 
 	/* defaults, until the device tells us otherwise */
 	sdp->sector_size = 512;
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 2c45b4140e67..a0df27db4d61 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -714,7 +714,8 @@ static int sr_probe(struct device *dev)
 
 	kref_init(&cd->kref);
 
-	disk = __alloc_disk_node(NUMA_NO_NODE, &sr_bio_compl_lkclass);
+	disk = __alloc_disk_node(sdev->request_queue, NUMA_NO_NODE,
+				 &sr_bio_compl_lkclass);
 	if (!disk)
 		goto fail_free;
 	mutex_init(&cd->lock);
@@ -765,7 +766,6 @@ static int sr_probe(struct device *dev)
 
 	set_capacity(disk, cd->capacity);
 	disk->private_data = &cd->driver;
-	disk->queue = sdev->request_queue;
 
 	if (register_cdrom(disk, &cd->cdi))
 		goto fail_minor;
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 02c0977993f2..875be3bc8afb 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -262,7 +262,8 @@ static inline sector_t get_capacity(struct gendisk *disk)
 int bdev_disk_changed(struct gendisk *disk, bool invalidate);
 void blk_drop_partitions(struct gendisk *disk);
 
-struct gendisk *__alloc_disk_node(int node_id, struct lock_class_key *lkclass);
+struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id,
+		struct lock_class_key *lkclass);
 extern void put_disk(struct gendisk *disk);
 struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass);
 
-- 
2.30.2