cifs: fix potential race with cifsd thread

To avoid racing with demultiplex thread while it is handling data on
socket, use cifs_signal_cifsd_for_reconnect() helper for marking
current server to reconnect and let the demultiplex thread handle the
rest.

Fixes: dca65818c80c ("cifs: use a different reconnect helper for non-cifsd threads")
Reviewed-by: Enzo Matsumiya <ematsumiya@suse.de>
Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index ee3b7c1..3ca06bd 100644 (file)
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -4465,7 +4465,7 @@ static int tree_connect_dfs_target(const unsigned int xid, struct cifs_tcon *tco
         */
        if (rc && server->current_fullpath != server->origin_fullpath) {
                server->current_fullpath = server->origin_fullpath;
-               cifs_reconnect(tcon->ses->server, true);
+               cifs_signal_cifsd_for_reconnect(server, true);
        }
 
        dfs_cache_free_tgts(tl);

diff --git a/fs/cifs/netmisc.c b/fs/cifs/netmisc.c
index ebe236b..235aa1b 100644 (file)
--- a/fs/cifs/netmisc.c
+++ b/fs/cifs/netmisc.c
@@ -896,7 +896,7 @@ map_and_check_smb_error(struct mid_q_entry *mid, bool logErr)
                if (class == ERRSRV && code == ERRbaduid) {
                        cifs_dbg(FYI, "Server returned 0x%x, reconnecting session...\n",
                                code);
-                       cifs_reconnect(mid->server, false);
+                       cifs_signal_cifsd_for_reconnect(mid->server, false);
                }
        }