[CIFS] Fix spurious reconnect on 2nd peek from read of SMB length

When retrying kernel_recvmsg() because of a short read, check returned
length against the remaining length, not against total length. This
avoids unneeded session reconnects which would otherwise occur when
kernel_recvmsg() finally returns zero when asked to read zero bytes.

Signed-off-by: Petr Tesarik <ptesarik@suse.cz>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index c4b32b7f435..fd9147cdb5a 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -438,9 +438,9 @@ incomplete_rcv:
                         csocket = server->ssocket;
                         wake_up(&server->response_q);
                         continue;
-                } else if (length < 4) {
-                        cFYI(1, ("less than four bytes received (%d bytes)",
-                              length));
+                } else if (length < pdu_length) {
+                        cFYI(1, ("requested %d bytes but only got %d bytes",
+                                  pdu_length, length));
                         pdu_length -= length;
                         msleep(1);
                         goto incomplete_rcv;