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[net-next,4/6] ionic: update eid test for overflow

Message ID 20200721203409.3432-5-snelson@pensando.io
State Accepted
Delegated to: David Miller
Headers show
Series ionic updates | expand

Commit Message

Shannon Nelson July 21, 2020, 8:34 p.m. UTC 
Fix up our comparison to better handle a potential (but largely
unlikely) wrap around.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
---
 drivers/net/ethernet/pensando/ionic/ionic_lif.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index bbfa25cd3294..db60c5405a58 100644
--- 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;