From: Lars Ellenberg <lars.ellenb...@linbit.com>
drbd_destroy_device means to give up reference counts
on the connection(s) reachable via the peer_device(s).
It must not do that by iterating via device->resource->connections,
resource and connections may have already been disassociated
by drbd_free_resource, and we'd leak connection refs.
Instead, iterate via device->peer_devices->connection.
Signed-off-by: Philipp Reisner <philipp.reis...@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenb...@linbit.com>
---
drivers/block/drbd/drbd_main.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 92547d1..56cf11b 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2160,7 +2160,7 @@ void drbd_destroy_device(struct kref *kref)
{
struct drbd_device *device = container_of(kref, struct drbd_device,
kref);
struct drbd_resource *resource = device->resource;
- struct drbd_connection *connection;
+ struct drbd_peer_device *peer_device, *tmp_peer_device;
del_timer_sync(&device->request_timer);
@@ -2191,12 +2191,16 @@ void drbd_destroy_device(struct kref *kref)
put_disk(device->vdisk);
blk_cleanup_queue(device->rq_queue);
kfree(device->rs_plan_s);
- kfree(first_peer_device(device));
+
+ /* not for_each_connection(connection, resource):
+ * those may have been cleaned up and disassociated already.
+ */
+ for_each_peer_device_safe(peer_device, tmp_peer_device, device) {
+ kref_put(&peer_device->connection->kref,
drbd_destroy_connection);
+ kfree(peer_device);
+ }
memset(device, 0xfd, sizeof(*device));
kfree(device);
-
- for_each_connection(connection, resource)
- kref_put(&connection->kref, drbd_destroy_connection);
kref_put(&resource->kref, drbd_destroy_resource);
}
--
1.9.1
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