cifs: call helper functions for marking channels for reconnect

cifs_mark_tcp_ses_conns_for_reconnect helper function is now
meant to be used by any of the threads to mark a channel
(or all the channels) for reconnect.

Replace all such manual changes to tcpStatus to use this
helper function, which takes care that the right channels,
smb sessions and tcons are marked for reconnect.

Also includes one line minor change
Reported-by: kernel test robot <lkp@intel.com>

Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/cifs_swn.c

@@ -396,11 +396,11 @@ static int cifs_swn_resource_state_changed(struct cifs_swn_reg *swnreg, const ch
 	switch (state) {
 	case CIFS_SWN_RESOURCE_STATE_UNAVAILABLE:
 		cifs_dbg(FYI, "%s: resource name '%s' become unavailable\n", __func__, name);
-		cifs_reconnect(swnreg->tcon->ses->server, true);
+		cifs_mark_tcp_ses_conns_for_reconnect(swnreg->tcon->ses->server, true);
 		break;
 	case CIFS_SWN_RESOURCE_STATE_AVAILABLE:
 		cifs_dbg(FYI, "%s: resource name '%s' become available\n", __func__, name);
-		cifs_reconnect(swnreg->tcon->ses->server, true);
+		cifs_mark_tcp_ses_conns_for_reconnect(swnreg->tcon->ses->server, true);
 		break;
 	case CIFS_SWN_RESOURCE_STATE_UNKNOWN:
 		cifs_dbg(FYI, "%s: resource name '%s' changed to unknown state\n", __func__, name);
@@ -498,7 +498,7 @@ static int cifs_swn_reconnect(struct cifs_tcon *tcon, struct sockaddr_storage *a
 		goto unlock;
 	}
 
-	cifs_reconnect(tcon->ses->server, false);
+	cifs_mark_tcp_ses_conns_for_reconnect(tcon->ses->server, false);
 
 unlock:
 	mutex_unlock(&tcon->ses->server->srv_mutex);

fs/cifs/dfs_cache.c

@@ -1355,7 +1355,7 @@ static void mark_for_reconnect_if_needed(struct cifs_tcon *tcon, struct dfs_cach
 	}
 
 	cifs_dbg(FYI, "%s: no cached or matched targets. mark dfs share for reconnect.\n", __func__);
-	cifs_reconnect(tcon->ses->server, true);
+	cifs_mark_tcp_ses_conns_for_reconnect(tcon->ses->server, true);
 }
 
 /* Refresh dfs referral of tcon and mark it for reconnect if needed */

fs/cifs/smb1ops.c

@@ -228,9 +228,7 @@ cifs_get_next_mid(struct TCP_Server_Info *server)
 	spin_unlock(&GlobalMid_Lock);
 
 	if (reconnect) {
-		spin_lock(&cifs_tcp_ses_lock);
-		server->tcpStatus = CifsNeedReconnect;
-		spin_unlock(&cifs_tcp_ses_lock);
+		cifs_mark_tcp_ses_conns_for_reconnect(server, false);
 	}
 
 	return mid;

fs/cifs/transport.c

@@ -430,10 +430,7 @@ __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst,
 		 * be taken as the remainder of this one. We need to kill the
 		 * socket so the server throws away the partial SMB
 		 */
-		spin_lock(&cifs_tcp_ses_lock);
-		if (server->tcpStatus != CifsExiting)
-			server->tcpStatus = CifsNeedReconnect;
-		spin_unlock(&cifs_tcp_ses_lock);
+		cifs_mark_tcp_ses_conns_for_reconnect(server, false);
 		trace_smb3_partial_send_reconnect(server->CurrentMid,
 						  server->conn_id, server->hostname);
 	}