RDMA/rtrs-srv: Set .release function for rtrs srv device during device init

The device .release function was not being set during the device
initialization. This was leading to the below warning, in error cases when
put_srv was called before device_add was called.

Warning:

Device '(null)' does not have a release() function, it is broken and must
be fixed. See Documentation/kobject.txt.

So, set the device .release function during device initialization in the
__alloc_srv() function.

Fixes: baa5b28b ("RDMA/rtrs-srv: Replace device_register with device_initialize and device_add")
Link: https://lore.kernel.org/r/20200907102216.104041-1-haris.iqbal@cloud.ionos.comSigned-off-by: Md Haris Iqbal <haris.iqbal@cloud.ionos.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Acked-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c

@@ -152,13 +152,6 @@ static struct attribute_group rtrs_srv_stats_attr_group = {
 	.attrs = rtrs_srv_stats_attrs,
 };
 
-static void rtrs_srv_dev_release(struct device *dev)
-{
-	struct rtrs_srv *srv = container_of(dev, struct rtrs_srv, dev);
-
-	kfree(srv);
-}
-
 static int rtrs_srv_create_once_sysfs_root_folders(struct rtrs_srv_sess *sess)
 {
 	struct rtrs_srv *srv = sess->srv;
@@ -172,7 +165,6 @@ static int rtrs_srv_create_once_sysfs_root_folders(struct rtrs_srv_sess *sess)
 		goto unlock;
 	}
 	srv->dev.class = rtrs_dev_class;
-	srv->dev.release = rtrs_srv_dev_release;
 	err = dev_set_name(&srv->dev, "%s", sess->s.sessname);
 	if (err)
 		goto unlock;

drivers/infiniband/ulp/rtrs/rtrs-srv.c

@@ -1319,6 +1319,13 @@ static int rtrs_srv_get_next_cq_vector(struct rtrs_srv_sess *sess)
 	return sess->cur_cq_vector;
 }
 
+static void rtrs_srv_dev_release(struct device *dev)
+{
+	struct rtrs_srv *srv = container_of(dev, struct rtrs_srv, dev);
+
+	kfree(srv);
+}
+
 static struct rtrs_srv *__alloc_srv(struct rtrs_srv_ctx *ctx,
 				     const uuid_t *paths_uuid)
 {
@@ -1337,6 +1344,7 @@ static struct rtrs_srv *__alloc_srv(struct rtrs_srv_ctx *ctx,
 	srv->queue_depth = sess_queue_depth;
 	srv->ctx = ctx;
 	device_initialize(&srv->dev);
+	srv->dev.release = rtrs_srv_dev_release;
 
 	srv->chunks = kcalloc(srv->queue_depth, sizeof(*srv->chunks),
 			      GFP_KERNEL);