linux-kernel - [PATCH 5.5 050/170] net: ena: fix continuous keep-alive resets

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Message-Id: <20200331085429.726319603@linuxfoundation.org>
Date:   Tue, 31 Mar 2020 10:57:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Noam Dagan <ndagan@...zon.com>,
        Arthur Kiyanovski <akiyano@...zon.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.5 050/170] net: ena: fix continuous keep-alive resets

From: Arthur Kiyanovski <akiyano@...zon.com>

[ Upstream commit dfdde1345bc124816f0fd42fa91b8748051e758e ]

last_keep_alive_jiffies is updated in probe and when a keep-alive
event is received.  In case the driver times-out on a keep-alive event,
it has high chances of continuously timing-out on keep-alive events.
This is because when the driver recovers from the keep-alive-timeout reset
the value of last_keep_alive_jiffies is very old, and if a keep-alive
event is not received before the next timer expires, the value of
last_keep_alive_jiffies will cause another keep-alive-timeout reset
and so forth in a loop.

Solution:
Update last_keep_alive_jiffies whenever the device is restored after
reset.

Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Noam Dagan <ndagan@...zon.com>
Signed-off-by: Arthur Kiyanovski <akiyano@...zon.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/amazon/ena/ena_netdev.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -2832,6 +2832,7 @@ static int ena_restore_device(struct ena
 		netif_carrier_on(adapter->netdev);
 
 	mod_timer(&adapter->timer_service, round_jiffies(jiffies + HZ));
+	adapter->last_keep_alive_jiffies = jiffies;
 	dev_err(&pdev->dev,
 		"Device reset completed successfully, Driver info: %s\n",
 		version);