cifs: on send failure, readjust server sequence number downward

If sending a call to the server fails for some reason (for instance, the
sending thread caught a signal), then we must readjust the sequence
number downward again or the next send will have it too high.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Signed-off-by: Steve French <smfrench@gmail.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 23bcd11c8103..3efdb9d5c0b8 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -61,6 +61,9 @@ send_nt_cancel(struct TCP_Server_Info *server, void *buf,
          */
         --server->sequence_number;
         rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
+        if (rc < 0)
+                server->sequence_number--;
+
         mutex_unlock(&server->srv_mutex);
 
         cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n",