netdev - [PATCH net-next 2/8] ionic: drain the work queue

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Message-Id: <20201001162246.18508-3-snelson@pensando.io>
Date:   Thu,  1 Oct 2020 09:22:40 -0700
From:   Shannon Nelson <snelson@...sando.io>
To:     netdev@...r.kernel.org, davem@...emloft.net
Cc:     Shannon Nelson <snelson@...sando.io>
Subject: [PATCH net-next 2/8] ionic: drain the work queue

Check through our work list for additional items.  This normally
will only have one item, but occasionally may have another
job waiting.  There really is no need reschedule ourself here.

Reported-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Shannon Nelson <snelson@...sando.io>
---
 .../net/ethernet/pensando/ionic/ionic_lif.c   | 23 +++++++++++--------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index 969979b31e93..53ac0e4402e7 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -62,15 +62,18 @@ static void ionic_lif_deferred_work(struct work_struct *work)
 	struct ionic_deferred *def = &lif->deferred;
 	struct ionic_deferred_work *w = NULL;
 
-	spin_lock_bh(&def->lock);
-	if (!list_empty(&def->list)) {
-		w = list_first_entry(&def->list,
-				     struct ionic_deferred_work, list);
-		list_del(&w->list);
-	}
-	spin_unlock_bh(&def->lock);
+	do {
+		spin_lock_bh(&def->lock);
+		if (!list_empty(&def->list)) {
+			w = list_first_entry(&def->list,
+					     struct ionic_deferred_work, list);
+			list_del(&w->list);
+		}
+		spin_unlock_bh(&def->lock);
+
+		if (!w)
+			break;
 
-	if (w) {
 		switch (w->type) {
 		case IONIC_DW_TYPE_RX_MODE:
 			ionic_lif_rx_mode(lif, w->rx_mode);
@@ -94,8 +97,8 @@ static void ionic_lif_deferred_work(struct work_struct *work)
 			break;
 		}
 		kfree(w);
-		schedule_work(&def->work);
-	}
+		w = NULL;
+	} while (true);
 }
 
 void ionic_lif_deferred_enqueue(struct ionic_deferred *def,
-- 
2.17.1