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drdb: Switch to kvfree_rcu() API

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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>
Reviewed-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com>
Link: https://lore.kernel.org/r/20220406190715.1938174-7-christoph.boehmwalder@linbit.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Uladzislau Rezki (Sony)
2022-04-06 21:07:14 +02:00
committed by Jens Axboe
parent e6be38a164
commit 90c6c29145
3 changed files with 6 additions and 12 deletions
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9
drivers/block/drbd/drbd_nl.c
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@@ -1602,8 +1602,7 @@ 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;
@@ -2434,8 +2433,7 @@ 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;
@@ -2849,8 +2847,7 @@ 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;
}