1 files changed, 40 insertions, 8 deletions

diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c
index 1a137b33858a..57c2a7df3457 100644
--- a/fs/smb/client/connect.c
+++ b/fs/smb/client/connect.c
@@ -132,6 +132,9 @@ static void smb2_query_server_interfaces(struct work_struct *work)
 	free_xid(xid);
 
 	if (rc) {
+		if (rc == -EOPNOTSUPP)
+			return;
+
 		cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n",
 				__func__, rc);
 	}
@@ -173,8 +176,12 @@ cifs_signal_cifsd_for_reconnect(struct TCP_Server_Info *server,
 	list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
 		spin_lock(&ses->chan_lock);
 		for (i = 0; i < ses->chan_count; i++) {
+			if (!ses->chans[i].server)
+				continue;
+
 			spin_lock(&ses->chans[i].server->srv_lock);
-			ses->chans[i].server->tcpStatus = CifsNeedReconnect;
+			if (ses->chans[i].server->tcpStatus != CifsExiting)
+				ses->chans[i].server->tcpStatus = CifsNeedReconnect;
 			spin_unlock(&ses->chans[i].server->srv_lock);
 		}
 		spin_unlock(&ses->chan_lock);
@@ -212,6 +219,14 @@ cifs_mark_tcp_ses_conns_for_reconnect(struct TCP_Server_Info *server,
 
 	spin_lock(&cifs_tcp_ses_lock);
 	list_for_each_entry_safe(ses, nses, &pserver->smb_ses_list, smb_ses_list) {
+		/*
+		 * if channel has been marked for termination, nothing to do
+		 * for the channel. in fact, we cannot find the channel for the
+		 * server. So safe to exit here
+		 */
+		if (server->terminate)
+			break;
+
 		/* check if iface is still active */
 		if (!cifs_chan_is_iface_active(ses, server))
 			cifs_chan_update_iface(ses, server);
@@ -246,6 +261,8 @@ cifs_mark_tcp_ses_conns_for_reconnect(struct TCP_Server_Info *server,
 			spin_lock(&tcon->tc_lock);
 			tcon->status = TID_NEED_RECON;
 			spin_unlock(&tcon->tc_lock);
+
+			cancel_delayed_work(&tcon->query_interfaces);
 		}
 		if (ses->tcon_ipc) {
 			ses->tcon_ipc->need_reconnect = true;
@@ -385,7 +402,13 @@ static int __cifs_reconnect(struct TCP_Server_Info *server,
 			spin_unlock(&server->srv_lock);
 			cifs_swn_reset_server_dstaddr(server);
 			cifs_server_unlock(server);
-			mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
+
+			/* increase ref count which reconnect work will drop */
+			spin_lock(&cifs_tcp_ses_lock);
+			server->srv_count++;
+			spin_unlock(&cifs_tcp_ses_lock);
+			if (mod_delayed_work(cifsiod_wq, &server->reconnect, 0))
+				cifs_put_tcp_session(server, false);
 		}
 	} while (server->tcpStatus == CifsNeedReconnect);
 
@@ -515,7 +538,13 @@ static int reconnect_dfs_server(struct TCP_Server_Info *server)
 		spin_unlock(&server->srv_lock);
 		cifs_swn_reset_server_dstaddr(server);
 		cifs_server_unlock(server);
-		mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
+
+		/* increase ref count which reconnect work will drop */
+		spin_lock(&cifs_tcp_ses_lock);
+		server->srv_count++;
+		spin_unlock(&cifs_tcp_ses_lock);
+		if (mod_delayed_work(cifsiod_wq, &server->reconnect, 0))
+			cifs_put_tcp_session(server, false);
 	} while (server->tcpStatus == CifsNeedReconnect);
 
 	mutex_lock(&server->refpath_lock);
@@ -1597,16 +1626,19 @@ cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
 
 	cancel_delayed_work_sync(&server->echo);
 
-	if (from_reconnect)
+	if (from_reconnect) {
 		/*
 		 * Avoid deadlock here: reconnect work calls
 		 * cifs_put_tcp_session() at its end. Need to be sure
 		 * that reconnect work does nothing with server pointer after
 		 * that step.
 		 */
-		cancel_delayed_work(&server->reconnect);
-	else
-		cancel_delayed_work_sync(&server->reconnect);
+		if (cancel_delayed_work(&server->reconnect))
+			cifs_put_tcp_session(server, from_reconnect);
+	} else {
+		if (cancel_delayed_work_sync(&server->reconnect))
+			cifs_put_tcp_session(server, from_reconnect);
+	}
 
 	spin_lock(&server->srv_lock);
 	server->tcpStatus = CifsExiting;
@@ -3560,7 +3592,7 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
 	ctx->prepath = NULL;
 
 out:
-	cifs_try_adding_channels(cifs_sb, mnt_ctx.ses);
+	cifs_try_adding_channels(mnt_ctx.ses);
 	rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
 	if (rc)
 		goto error;