netdev - [PATCH net] ionic: Add missing err handling for queue reconfig

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Date: Fri, 4 Aug 2023 13:56:22 -0700
From: Shannon Nelson <shannon.nelson@....com>
To: <netdev@...r.kernel.org>, <davem@...emloft.net>, <kuba@...nel.org>
CC: <brett.creeley@....com>, <drivers@...sando.io>, Nitya Sunkad
	<nitya.sunkad@....com>, Shannon Nelson <shannon.nelson@....com>
Subject: [PATCH net] ionic: Add missing err handling for queue reconfig

From: Nitya Sunkad <nitya.sunkad@....com>

ionic_start_queues_reconfig returns an error code if txrx_init fails.
Handle this error code in the relevant places.

This fixes a corner case where the device could get left in a detached
state if the CMB reconfig fails and the attempt to clean up the mess
also fails. Note that calling netif_device_attach when the netdev is
already attached does not lead to unexpected behavior.

Change goto name "errout" to "err_out" to maintain consistency across
goto statements.

Fixes: 40bc471dc714 ("ionic: add tx/rx-push support with device Component Memory Buffers")
Fixes: 6f7d6f0fd7a3 ("ionic: pull reset_queues into tx_timeout handler")
Signed-off-by: Nitya Sunkad <nitya.sunkad@....com>
Signed-off-by: Shannon Nelson <shannon.nelson@....com>
---
 .../net/ethernet/pensando/ionic/ionic_lif.c   | 23 +++++++++++++------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index 612b0015dc43..432fb93aa801 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -1817,6 +1817,7 @@ static int ionic_change_mtu(struct net_device *netdev, int new_mtu)
 static void ionic_tx_timeout_work(struct work_struct *ws)
 {
 	struct ionic_lif *lif = container_of(ws, struct ionic_lif, tx_timeout_work);
+	int err;
 
 	if (test_bit(IONIC_LIF_F_FW_RESET, lif->state))
 		return;
@@ -1829,8 +1830,11 @@ static void ionic_tx_timeout_work(struct work_struct *ws)
 
 	mutex_lock(&lif->queue_lock);
 	ionic_stop_queues_reconfig(lif);
-	ionic_start_queues_reconfig(lif);
+	err = ionic_start_queues_reconfig(lif);
 	mutex_unlock(&lif->queue_lock);
+
+	if (err)
+		dev_err(lif->ionic->dev, "%s: Restarting queues failed\n", __func__);
 }
 
 static void ionic_tx_timeout(struct net_device *netdev, unsigned int txqueue)
@@ -2800,17 +2804,22 @@ static int ionic_cmb_reconfig(struct ionic_lif *lif,
 			if (err) {
 				dev_err(lif->ionic->dev,
 					"CMB restore failed: %d\n", err);
-				goto errout;
+				goto err_out;
 			}
 		}
 
-		ionic_start_queues_reconfig(lif);
-	} else {
-		/* This was detached in ionic_stop_queues_reconfig() */
-		netif_device_attach(lif->netdev);
+		err = ionic_start_queues_reconfig(lif);
+		if (err) {
+			dev_err(lif->ionic->dev,
+				"CMB reconfig failed: %d\n", err);
+			goto err_out;
+		}
 	}
 
-errout:
+err_out:
+	/* This was detached in ionic_stop_queues_reconfig() */
+	netif_device_attach(lif->netdev);
+
 	return err;
 }
 
-- 
2.17.1