netdev - [PATCH net-next 4/6] ionic: add queue lock around open and stop

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Message-Id: <20210827185512.50206-5-snelson@pensando.io>
Date:   Fri, 27 Aug 2021 11:55:10 -0700
From:   Shannon Nelson <snelson@...sando.io>
To:     davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org
Cc:     drivers@...sando.io, jtoppins@...hat.com,
        Shannon Nelson <snelson@...sando.io>
Subject: [PATCH net-next 4/6] ionic: add queue lock around open and stop

Add the queue configuration lock to ionic_open() and
ionic_stop() so that they don't collide with other in parallel
queue configuration actions such as MTU changes as can be
demonstrated with a tight loop of ifup/change-mtu/ifdown.

Signed-off-by: Shannon Nelson <snelson@...sando.io>
---
 drivers/net/ethernet/pensando/ionic/ionic_lif.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index d69c80c3eaa2..1d31b9385849 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -2233,9 +2233,11 @@ static int ionic_open(struct net_device *netdev)
 	if (test_and_clear_bit(IONIC_LIF_F_BROKEN, lif->state))
 		netdev_info(netdev, "clearing broken state\n");
 
+	mutex_lock(&lif->queue_lock);
+
 	err = ionic_txrx_alloc(lif);
 	if (err)
-		return err;
+		goto err_unlock;
 
 	err = ionic_txrx_init(lif);
 	if (err)
@@ -2256,12 +2258,15 @@ static int ionic_open(struct net_device *netdev)
 			goto err_txrx_deinit;
 	}
 
+	mutex_unlock(&lif->queue_lock);
 	return 0;
 
 err_txrx_deinit:
 	ionic_txrx_deinit(lif);
 err_txrx_free:
 	ionic_txrx_free(lif);
+err_unlock:
+	mutex_unlock(&lif->queue_lock);
 	return err;
 }
 
@@ -2281,9 +2286,11 @@ static int ionic_stop(struct net_device *netdev)
 	if (test_bit(IONIC_LIF_F_FW_RESET, lif->state))
 		return 0;
 
+	mutex_lock(&lif->queue_lock);
 	ionic_stop_queues(lif);
 	ionic_txrx_deinit(lif);
 	ionic_txrx_free(lif);
+	mutex_unlock(&lif->queue_lock);
 
 	return 0;
 }
-- 
2.17.1