[CIFS] Add support for suspend

cifsd had been preventing software suspend from completing.

Signed-off-by: pavel@suse.de
Signed-off-by: Steve French <sfrench@us.ibm.com>  lightly modified
---

 fs/cifs/CHANGES   |    3 ++-
 fs/cifs/cifsfs.c  |    4 ++++
 fs/cifs/connect.c |    2 ++
 3 files changed, 8 insertions(+), 1 deletions(-)

fs/cifs/connect.c

@@ -355,6 +355,8 @@ cifs_demultiplex_thread(struct TCP_Server_Info *server)
 	}
 
 	while (server->tcpStatus != CifsExiting) {
+		if(try_to_freeze())
+			continue;
 		if (bigbuf == NULL) {
 			bigbuf = cifs_buf_get();
 			if(bigbuf == NULL) {