CIFS: reconnect thread reschedule itself

commit 18ea43113f5b74a97dd4be9bddbac10d68b1a6ce upstream.

In case of error, smb2_reconnect_server reschedule itself
with a delay, to avoid being too aggressive.

Signed-off-by: Germano Percossi <germano.percossi@citrix.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index bdd32925a15e..7080dac3592c 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1987,6 +1987,9 @@ void smb2_reconnect_server(struct work_struct *work)
         struct cifs_tcon *tcon, *tcon2;
         struct list_head tmp_list;
         int tcon_exist = false;
+        int rc;
+        int resched = false;
+
 
         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
         mutex_lock(&server->reconnect_mutex);
@@ -2014,13 +2017,18 @@ void smb2_reconnect_server(struct work_struct *work)
         spin_unlock(&cifs_tcp_ses_lock);
 
         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
-                if (!smb2_reconnect(SMB2_INTERNAL_CMD, tcon))
+                rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
+                if (!rc)
                         cifs_reopen_persistent_handles(tcon);
+                else
+                        resched = true;
                 list_del_init(&tcon->rlist);
                 cifs_put_tcon(tcon);
         }
 
         cifs_dbg(FYI, "Reconnecting tcons finished\n");
+        if (resched)
+                queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
         mutex_unlock(&server->reconnect_mutex);
 
         /* now we can safely release srv struct */