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Commit bc534d86 authored by Alex Elder's avatar Alex Elder
Browse files

rbd: move ctl_mutex lock inside rbd_client_create() 



Since rbd_client_create() is only called in one place, move the
acquisition of the mutex around that call inside that function.

Signed-off-by: default avatarAlex Elder <elder@dreamhost.com>
Signed-off-by: default avatarSage Weil <sage@newdream.net>
parent d97081b0

drivers/block/rbd.c

+7 −4
Original line number Diff line number Diff line
@@ -257,9 +257,11 @@ static struct rbd_client *rbd_client_create(struct ceph_options *opt, 
	kref_init(&rbdc->kref);

	INIT_LIST_HEAD(&rbdc->node);



	mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);



	rbdc->client = ceph_create_client(opt, rbdc, 0, 0);

	if (IS_ERR(rbdc->client))

		goto out_rbdc;

		goto out_mutex;

	opt = NULL; /* Now rbdc->client is responsible for opt */



	ret = ceph_open_session(rbdc->client);
@@ -272,12 +274,15 @@ static struct rbd_client *rbd_client_create(struct ceph_options *opt, 
	list_add_tail(&rbdc->node, &rbd_client_list);

	spin_unlock(&node_lock);



	mutex_unlock(&ctl_mutex);



	dout("rbd_client_create created %p\n", rbdc);

	return rbdc;



out_err:

	ceph_destroy_client(rbdc->client);

out_rbdc:

out_mutex:

	mutex_unlock(&ctl_mutex);

	kfree(rbdc);

out_opt:

	if (opt)
@@ -396,9 +401,7 @@ static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr, 
	}

	spin_unlock(&node_lock);



	mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);

	rbdc = rbd_client_create(opt, rbd_opts);

	mutex_unlock(&ctl_mutex);



	if (IS_ERR(rbdc)) {

		ret = PTR_ERR(rbdc);