[PATCH] drdb: Switch to kvfree_rcu() API

["Uladzislau Rezki (Sony)" <urezki@gmail.com>]

Instead of invoking a synchronize_rcu() to free a pointer
after a grace period we can directly make use of new API
that does the same but in more efficient way.

TO: Jens Axboe <axboe@kernel.dk>
TO: Philipp Reisner <philipp.reisner@linbit.com>
TO: Jason Gunthorpe <jgg@nvidia.com>
TO: drbd-dev@lists.linbit.com
TO: linux-block@vger.kernel.org
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
---
 drivers/block/drbd/drbd_nl.c       | 9 +++------
 drivers/block/drbd/drbd_receiver.c | 6 ++----
 drivers/block/drbd/drbd_state.c    | 3 +--
 3 files changed, 6 insertions(+), 12 deletions(-)

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 44ccf8b4f4b2..28f4d84945fd 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -1679,8 +1679,7 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
 			drbd_send_sync_param(peer_device);
 	}
 
-	synchronize_rcu();
-	kfree(old_disk_conf);
+	kvfree_rcu(old_disk_conf);
 	kfree(old_plan);
 	mod_timer(&device->request_timer, jiffies + HZ);
 	goto success;
@@ -2511,8 +2510,7 @@ int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
 
 	mutex_unlock(&connection->resource->conf_update);
 	mutex_unlock(&connection->data.mutex);
-	synchronize_rcu();
-	kfree(old_net_conf);
+	kvfree_rcu(old_net_conf);
 
 	if (connection->cstate >= C_WF_REPORT_PARAMS) {
 		struct drbd_peer_device *peer_device;
@@ -2925,8 +2923,7 @@ int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
 		new_disk_conf->disk_size = (sector_t)rs.resize_size;
 		rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf);
 		mutex_unlock(&device->resource->conf_update);
-		synchronize_rcu();
-		kfree(old_disk_conf);
+		kvfree_rcu(old_disk_conf);
 		new_disk_conf = NULL;
 	}
 
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 1f740e42e457..d73a53242a75 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -3799,8 +3799,7 @@ static int receive_protocol(struct drbd_connection *connection, struct packet_in
 		drbd_info(connection, "peer data-integrity-alg: %s\n",
 			  integrity_alg[0] ? integrity_alg : "(none)");
 
-	synchronize_rcu();
-	kfree(old_net_conf);
+	kvfree_rcu(old_net_conf);
 	return 0;
 
 disconnect_rcu_unlock:
@@ -4168,8 +4167,7 @@ static int receive_sizes(struct drbd_connection *connection, struct packet_info
 
 			rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf);
 			mutex_unlock(&connection->resource->conf_update);
-			synchronize_rcu();
-			kfree(old_disk_conf);
+			kvfree_rcu(old_disk_conf);
 
 			drbd_info(device, "Peer sets u_size to %lu sectors (old: %lu)\n",
 				 (unsigned long)p_usize, (unsigned long)my_usize);
diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c
index b8a27818ab3f..826e496821c7 100644
--- a/drivers/block/drbd/drbd_state.c
+++ b/drivers/block/drbd/drbd_state.c
@@ -2071,8 +2071,7 @@ static int w_after_conn_state_ch(struct drbd_work *w, int unused)
 		conn_free_crypto(connection);
 		mutex_unlock(&connection->resource->conf_update);
 
-		synchronize_rcu();
-		kfree(old_conf);
+		kvfree_rcu(old_conf);
 	}
 
 	if (ns_max.susp_fen) {
-- 
2.30.2