[PATCH 2/4] nvdimm/btt: don't allocate unused major device number

[NeilBrown]

alloc_disk(0) does not require or use a ->major number,
all devices are allocated with a major of BLOCK_EXT_MAJOR.

So don't allocate btt_major.

Signed-off-by: NeilBrown <ne...@suse.com>
---
 drivers/nvdimm/btt.c |   19 ++-----------------
 1 file changed, 2 insertions(+), 17 deletions(-)

diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index efb2c1ceef98..c32cbb593600 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -31,8 +31,6 @@ enum log_ent_request {
        LOG_OLD_ENT
 };
 
-static int btt_major;
-
 static int arena_read_bytes(struct arena_info *arena, resource_size_t offset,
                void *buf, size_t n)
 {
@@ -1246,7 +1244,6 @@ static int btt_blk_init(struct btt *btt)
 
        nvdimm_namespace_disk_name(ndns, btt->btt_disk->disk_name);
        btt->btt_disk->driverfs_dev = &btt->nd_btt->dev;
-       btt->btt_disk->major = btt_major;
        btt->btt_disk->first_minor = 0;
        btt->btt_disk->fops = &btt_fops;
        btt->btt_disk->private_data = btt;
@@ -1423,22 +1420,11 @@ EXPORT_SYMBOL(nvdimm_namespace_detach_btt);
 
 static int __init nd_btt_init(void)
 {
-       int rc;
-
-       btt_major = register_blkdev(0, "btt");
-       if (btt_major < 0)
-               return btt_major;
+       int rc = 0;
 
        debugfs_root = debugfs_create_dir("btt", NULL);
-       if (IS_ERR_OR_NULL(debugfs_root)) {
+       if (IS_ERR_OR_NULL(debugfs_root))
                rc = -ENXIO;
-               goto err_debugfs;
-       }
-
-       return 0;
-
- err_debugfs:
-       unregister_blkdev(btt_major, "btt");
 
        return rc;
 }
@@ -1446,7 +1432,6 @@ static int __init nd_btt_init(void)
 static void __exit nd_btt_exit(void)
 {
        debugfs_remove_recursive(debugfs_root);
-       unregister_blkdev(btt_major, "btt");
 }
 
 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_BTT);