be2net: don't rearm mcc cq when device is not open

When an MCC cmd is issued (via a netdev/ethtool op)
while the device is not open, the MCC CQ gets processed but the EQ
is not processed (as isr is not registered.) This can cause the EQ
to become full. So, while the device is not open, CQ must not be re-armed
to prevent EQ entries.

Signed-off-by: Sathya Perla <sathyap@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 2 deletions

diff --git a/drivers/net/benet/be_cmds.c b/drivers/net/benet/be_cmds.c
index 477f82b..d7546b4 100644
--- a/drivers/net/benet/be_cmds.c
+++ b/drivers/net/benet/be_cmds.c
@@ -104,10 +104,26 @@ static struct be_mcc_compl *be_mcc_compl_get(struct be_adapter *adapter)
 	return NULL;
 }
 
+void be_async_mcc_enable(struct be_adapter *adapter)
+{
+	spin_lock_bh(&adapter->mcc_cq_lock);
+
+	be_cq_notify(adapter, adapter->mcc_obj.cq.id, true, 0);
+	adapter->mcc_obj.rearm_cq = true;
+
+	spin_unlock_bh(&adapter->mcc_cq_lock);
+}
+
+void be_async_mcc_disable(struct be_adapter *adapter)
+{
+	adapter->mcc_obj.rearm_cq = false;
+}
+
 int be_process_mcc(struct be_adapter *adapter)
 {
 	struct be_mcc_compl *compl;
 	int num = 0, status = 0;
+	struct be_mcc_obj *mcc_obj = &adapter->mcc_obj;
 
 	spin_lock_bh(&adapter->mcc_cq_lock);
 	while ((compl = be_mcc_compl_get(adapter))) {
@@ -120,14 +136,14 @@ int be_process_mcc(struct be_adapter *adapter)
 				(struct be_async_event_link_state *) compl);
 		} else if (compl->flags & CQE_FLAGS_COMPLETED_MASK) {
 				status = be_mcc_compl_process(adapter, compl);
-				atomic_dec(&adapter->mcc_obj.q.used);
+				atomic_dec(&mcc_obj->q.used);
 		}
 		be_mcc_compl_use(compl);
 		num++;
 	}
 
 	if (num)
-		be_cq_notify(adapter, adapter->mcc_obj.cq.id, true, num);
+		be_cq_notify(adapter, mcc_obj->cq.id, mcc_obj->rearm_cq, num);
 
 	spin_unlock_bh(&adapter->mcc_cq_lock);
 	return status;