smb: client: use disable[_delayed]_work_sync in smbdirect.c

This makes it safer during the disconnect and avoids
requeueing.

It's ok to call disable[delayed_]work[_sync]() more than once.

Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Fixes: 050b8c3 ("smbd: Make upper layer decide when to destroy the transport")
Fixes: f198186 ("CIFS: SMBD: Establish SMB Direct connection")
Fixes: c739858 ("CIFS: SMBD: Implement RDMA memory registration")
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: metze-samba

fs/smb/client/smbdirect.c

@@ -1353,7 +1353,7 @@ void smbd_destroy(struct TCP_Server_Info *server)
 	sc->ib.qp = NULL;
 
 	log_rdma_event(INFO, "cancelling idle timer\n");
-	cancel_delayed_work_sync(&info->idle_timer_work);
+	disable_delayed_work_sync(&info->idle_timer_work);
 
 	/* It's not possible for upper layer to get to reassembly */
 	log_rdma_event(INFO, "drain the reassembly queue\n");
@@ -1726,7 +1726,7 @@ static struct smbd_connection *_smbd_get_connection(
 	return NULL;
 
 negotiation_failed:
-	cancel_delayed_work_sync(&info->idle_timer_work);
+	disable_delayed_work_sync(&info->idle_timer_work);
 	destroy_caches_and_workqueue(info);
 	sc->status = SMBDIRECT_SOCKET_NEGOTIATE_FAILED;
 	rdma_disconnect(sc->rdma.cm_id);
@@ -2085,7 +2085,7 @@ static void destroy_mr_list(struct smbd_connection *info)
 	struct smbdirect_socket *sc = &info->socket;
 	struct smbd_mr *mr, *tmp;
 
-	cancel_work_sync(&info->mr_recovery_work);
+	disable_work_sync(&info->mr_recovery_work);
 	list_for_each_entry_safe(mr, tmp, &info->mr_list, list) {
 		if (mr->state == MR_INVALIDATED)
 			ib_dma_unmap_sg(sc->ib.dev, mr->sgt.sgl,