rbd: consolidate rbd_dev init in rbd_add()

Group the allocation and initialization of fields of the rbd device
structure created in rbd_add().  Move the grouped code down later in
the function, just prior to the call to rbd_dev_probe().  This is
for the most part simple code movement.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index a528d4c..4771de2 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -3232,29 +3232,16 @@ static ssize_t rbd_add(struct bus_type *bus,
        if (!try_module_get(THIS_MODULE))
                return -ENODEV;
 
-       rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL);
-       if (!rbd_dev)
-               return -ENOMEM;
-
-       /* static rbd_device initialization */
-       spin_lock_init(&rbd_dev->lock);
-       INIT_LIST_HEAD(&rbd_dev->node);
-       INIT_LIST_HEAD(&rbd_dev->snaps);
-       init_rwsem(&rbd_dev->header_rwsem);
-
        /* parse add command */
        rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec);
        if (rc < 0)
-               goto err_out_mem;
-
-       rbd_dev->mapping.read_only = rbd_opts->read_only;
+               goto err_out_module;
 
        rbdc = rbd_get_client(ceph_opts);
        if (IS_ERR(rbdc)) {
                rc = PTR_ERR(rbdc);
                goto err_out_args;
        }
-       rbd_dev->rbd_client = rbdc;
        ceph_opts = NULL;       /* ceph_opts now owned by rbd_dev client */
 
        /* pick the pool */
@@ -3264,11 +3251,22 @@ static ssize_t rbd_add(struct bus_type *bus,
                goto err_out_client;
        spec->pool_id = (u64) rc;
 
+       rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL);
+       if (!rbd_dev)
+               goto err_out_client;
+
+       spin_lock_init(&rbd_dev->lock);
+       INIT_LIST_HEAD(&rbd_dev->node);
+       INIT_LIST_HEAD(&rbd_dev->snaps);
+       init_rwsem(&rbd_dev->header_rwsem);
+       rbd_dev->rbd_client = rbdc;
        rbd_dev->spec = spec;
 
+       rbd_dev->mapping.read_only = rbd_opts->read_only;
+
        rc = rbd_dev_probe(rbd_dev);
        if (rc < 0)
-               goto err_out_client;
+               goto err_out_mem;
 
        /* no need to lock here, as rbd_dev is not registered yet */
        rc = rbd_dev_snaps_update(rbd_dev);
@@ -3348,19 +3346,20 @@ err_out_snaps:
        rbd_remove_all_snaps(rbd_dev);
 err_out_probe:
        rbd_header_free(&rbd_dev->header);
-err_out_client:
        kfree(rbd_dev->header_name);
+err_out_mem:
+       kfree(rbd_dev);
+err_out_client:
        rbd_put_client(rbdc);
 err_out_args:
        if (ceph_opts)
                ceph_destroy_options(ceph_opts);
        kfree(rbd_opts);
        rbd_spec_put(spec);
-err_out_mem:
-       kfree(rbd_dev);
+err_out_module:
+       module_put(THIS_MODULE);
 
        dout("Error adding device %s\n", buf);
-       module_put(THIS_MODULE);
 
        return (ssize_t) rc;
 }