drbd: short-circuit in maybe_pull_ahead

If we already "pulled ahead", we can short-circuit,
and avoid logging the same messages over and over again.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index f07a724998ea..3824d5c737e6 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -899,6 +899,9 @@ static void maybe_pull_ahead(struct drbd_device *device)
             connection->agreed_pro_version < 96)
                 return;
 
+        if (on_congestion == OC_PULL_AHEAD && device->state.conn == C_AHEAD)
+                return; /* nothing to do ... */
+
         /* If I don't even have good local storage, we can not reasonably try
          * to pull ahead of the peer. We also need the local reference to make
          * sure device->act_log is there.