netdev - [PATCH AUTOSEL 5.4 36/45] ionic: update eid test for overflow

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Message-Id: <20200810191153.3794446-36-sashal@kernel.org>
Date:   Mon, 10 Aug 2020 15:11:44 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Shannon Nelson <snelson@...sando.io>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 36/45] ionic: update eid test for overflow

From: Shannon Nelson <snelson@...sando.io>

[ Upstream commit 3fbc9bb6ca32d12d4d32a7ae32abef67ac95f889 ]

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

Signed-off-by: Shannon Nelson <snelson@...sando.io>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/pensando/ionic/ionic_lif.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index c00ec9a020973..e66002251596b 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -666,7 +666,7 @@ 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;
-- 
2.25.1