ionic: update eid test for overflow

Fix up our comparison to better handle a potential (but largely
unlikely) wrap around.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index bbfa25c..db60c54 100644 (file)
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -719,7 +719,7 @@ static bool ionic_notifyq_service(struct ionic_cq *cq,
        eid = le64_to_cpu(comp->event.eid);
 
        /* Have we run out of new completions to process? */
-       if (eid <= lif->last_eid)
+       if ((s64)(eid - lif->last_eid) <= 0)
                return false;
 
        lif->last_eid = eid;