From: Shannon Nelson <snelson@pensando.io>
Date: Mon, 30 Sep 2019 20:03:23 -0700
Subject: ionic: use wait_on_bit_lock() rather than open code
Patch-mainline: v5.5-rc1
Git-commit: d229be4b27a8b76d897f73dede9c25e6a6d3a6ad
References: bsc#1167773

Replace the open-coded ionic_wait_for_bit() with the
kernel's wait_on_bit_lock().

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/pensando/ionic/ionic_ethtool.c |   12 ++++++++----
 drivers/net/ethernet/pensando/ionic/ionic_lif.c     |    5 +++--
 drivers/net/ethernet/pensando/ionic/ionic_lif.h     |    9 ++-------
 3 files changed, 13 insertions(+), 13 deletions(-)

--- a/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
@@ -453,6 +453,7 @@ static int ionic_set_ringparam(struct ne
 {
 	struct ionic_lif *lif = netdev_priv(netdev);
 	bool running;
+	int err;
 
 	if (ring->rx_mini_pending || ring->rx_jumbo_pending) {
 		netdev_info(netdev, "Changing jumbo or mini descriptors not supported\n");
@@ -470,8 +471,9 @@ static int ionic_set_ringparam(struct ne
 	    ring->rx_pending == lif->nrxq_descs)
 		return 0;
 
-	if (!ionic_wait_for_bit(lif, IONIC_LIF_QUEUE_RESET))
-		return -EBUSY;
+	err = ionic_wait_for_bit(lif, IONIC_LIF_QUEUE_RESET);
+	if (err)
+		return err;
 
 	running = test_bit(IONIC_LIF_UP, lif->state);
 	if (running)
@@ -504,6 +506,7 @@ static int ionic_set_channels(struct net
 {
 	struct ionic_lif *lif = netdev_priv(netdev);
 	bool running;
+	int err;
 
 	if (!ch->combined_count || ch->other_count ||
 	    ch->rx_count || ch->tx_count)
@@ -512,8 +515,9 @@ static int ionic_set_channels(struct net
 	if (ch->combined_count == lif->nxqs)
 		return 0;
 
-	if (!ionic_wait_for_bit(lif, IONIC_LIF_QUEUE_RESET))
-		return -EBUSY;
+	err = ionic_wait_for_bit(lif, IONIC_LIF_QUEUE_RESET);
+	if (err)
+		return err;
 
 	running = test_bit(IONIC_LIF_UP, lif->state);
 	if (running)
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -1621,8 +1621,9 @@ int ionic_reset_queues(struct ionic_lif
 	/* Put off the next watchdog timeout */
 	netif_trans_update(lif->netdev);
 
-	if (!ionic_wait_for_bit(lif, IONIC_LIF_QUEUE_RESET))
-		return -EBUSY;
+	err = ionic_wait_for_bit(lif, IONIC_LIF_QUEUE_RESET);
+	if (err)
+		return err;
 
 	running = netif_running(lif->netdev);
 	if (running)
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
@@ -187,15 +187,10 @@ struct ionic_lif {
 #define lif_to_txq(lif, i)	(&lif_to_txqcq((lif), i)->q)
 #define lif_to_rxq(lif, i)	(&lif_to_txqcq((lif), i)->q)
 
+/* return 0 if successfully set the bit, else non-zero */
 static inline int ionic_wait_for_bit(struct ionic_lif *lif, int bitname)
 {
-	unsigned long tlimit = jiffies + HZ;
-
-	while (test_and_set_bit(bitname, lif->state) &&
-	       time_before(jiffies, tlimit))
-		usleep_range(100, 200);
-
-	return test_bit(bitname, lif->state);
+	return wait_on_bit_lock(lif->state, bitname, TASK_INTERRUPTIBLE);
 }
 
 static inline u32 ionic_coal_usec_to_hw(struct ionic *ionic, u32 usecs)