drbd: fix spurious protocol error

If we cannot satisfy a request (because our disk just broke),
we still need to drain the payload.  Or we'll get a protocol error
when interpreting the payload as DRBD packet header.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index e4e4eddf04f2..983e49cbd233 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -2085,7 +2085,8 @@ static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packets cmd, un
                             "no local data.\n");
                 drbd_send_ack_rp(mdev, cmd == P_DATA_REQUEST ? P_NEG_DREPLY :
                                  P_NEG_RS_DREPLY , p);
-                return TRUE;
+                /* drain possibly payload */
+                return drbd_drain_block(mdev, digest_size);
         }
 
         /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD