From: Intiyaz Basha <intiyaz.basha@cavium.com>
Date: Sun, 9 Sep 2018 23:34:26 -0700
Subject: liquidio: Removed droq lock
Patch-mainline: v4.20-rc1
Git-commit: 8bf6edcd96fc397988bbac5160fe1a5bdfb18c5f
References: bsc#1119406 FATE#326562

With the changes in patch 1 and 2, droq lock is not required.
So removing droq lock.

Signed-off-by: Intiyaz Basha <intiyaz.basha@cavium.com>
Acked-by: Derek Chickles <derek.chickles@cavium.com>
Signed-off-by: Felix Manlunas <felix.manlunas@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/cavium/liquidio/octeon_device.c |    4 --
 drivers/net/ethernet/cavium/liquidio/octeon_droq.c   |   33 +------------------
 drivers/net/ethernet/cavium/liquidio/octeon_droq.h   |    3 -
 3 files changed, 3 insertions(+), 37 deletions(-)

--- a/drivers/net/ethernet/cavium/liquidio/octeon_device.c
+++ b/drivers/net/ethernet/cavium/liquidio/octeon_device.c
@@ -1440,12 +1440,8 @@ void lio_enable_irq(struct octeon_droq *
 	/* the whole thing needs to be atomic, ideally */
 	if (droq) {
 		pkts_pend = (u32)atomic_read(&droq->pkts_pending);
-		spin_lock_bh(&droq->lock);
 		writel(droq->pkt_count - pkts_pend, droq->pkts_sent_reg);
 		droq->pkt_count = pkts_pend;
-		/* this write needs to be flushed before we release the lock */
-		mmiowb();
-		spin_unlock_bh(&droq->lock);
 		oct = droq->oct_dev;
 	}
 	if (iq) {
--- a/drivers/net/ethernet/cavium/liquidio/octeon_droq.c
+++ b/drivers/net/ethernet/cavium/liquidio/octeon_droq.c
@@ -302,8 +302,6 @@ int octeon_init_droq(struct octeon_devic
 	dev_dbg(&oct->pci_dev->dev, "DROQ INIT: max_empty_descs: %d\n",
 		droq->max_empty_descs);
 
-	spin_lock_init(&droq->lock);
-
 	INIT_LIST_HEAD(&droq->dispatch_list);
 
 	/* For 56xx Pass1, this function won't be called, so no checks. */
@@ -507,7 +505,6 @@ int octeon_retry_droq_refill(struct octe
 	int desc_refilled, reschedule = 1;
 	u32 pkts_credit;
 
-	spin_lock_bh(&droq->lock);
 	pkts_credit = readl(droq->pkts_credit_reg);
 	desc_refilled = octeon_droq_refill(oct, droq);
 	if (desc_refilled) {
@@ -523,7 +520,6 @@ int octeon_retry_droq_refill(struct octe
 		if (pkts_credit + desc_refilled >= CN23XX_SLI_DEF_BP)
 			reschedule = 0;
 	}
-	spin_unlock_bh(&droq->lock);
 
 	return reschedule;
 }
@@ -757,25 +753,17 @@ octeon_droq_process_packets(struct octeo
 	u32 pkt_count = 0;
 	struct list_head *tmp, *tmp2;
 
-	/* Grab the droq lock */
-	spin_lock(&droq->lock);
-
 	octeon_droq_check_hw_for_pkts(droq);
 	pkt_count = atomic_read(&droq->pkts_pending);
 
-	if (!pkt_count) {
-		spin_unlock(&droq->lock);
+	if (!pkt_count)
 		return 0;
-	}
 
 	if (pkt_count > budget)
 		pkt_count = budget;
 
 	octeon_droq_fast_process_packets(oct, droq, pkt_count);
 
-	/* Release the spin lock */
-	spin_unlock(&droq->lock);
-
 	list_for_each_safe(tmp, tmp2, &droq->dispatch_list) {
 		struct __dispatch *rdisp = (struct __dispatch *)tmp;
 
@@ -810,8 +798,6 @@ octeon_droq_process_poll_pkts(struct oct
 	if (budget > droq->max_count)
 		budget = droq->max_count;
 
-	spin_lock(&droq->lock);
-
 	while (total_pkts_processed < budget) {
 		octeon_droq_check_hw_for_pkts(droq);
 
@@ -828,8 +814,6 @@ octeon_droq_process_poll_pkts(struct oct
 		total_pkts_processed += pkts_processed;
 	}
 
-	spin_unlock(&droq->lock);
-
 	list_for_each_safe(tmp, tmp2, &droq->dispatch_list) {
 		struct __dispatch *rdisp = (struct __dispatch *)tmp;
 
@@ -889,9 +873,8 @@ octeon_enable_irq(struct octeon_device *
 int octeon_register_droq_ops(struct octeon_device *oct, u32 q_no,
 			     struct octeon_droq_ops *ops)
 {
-	struct octeon_droq *droq;
-	unsigned long flags;
 	struct octeon_config *oct_cfg = NULL;
+	struct octeon_droq *droq;
 
 	oct_cfg = octeon_get_conf(oct);
 
@@ -911,21 +894,15 @@ int octeon_register_droq_ops(struct octe
 	}
 
 	droq = oct->droq[q_no];
-
-	spin_lock_irqsave(&droq->lock, flags);
-
 	memcpy(&droq->ops, ops, sizeof(struct octeon_droq_ops));
 
-	spin_unlock_irqrestore(&droq->lock, flags);
-
 	return 0;
 }
 
 int octeon_unregister_droq_ops(struct octeon_device *oct, u32 q_no)
 {
-	unsigned long flags;
-	struct octeon_droq *droq;
 	struct octeon_config *oct_cfg = NULL;
+	struct octeon_droq *droq;
 
 	oct_cfg = octeon_get_conf(oct);
 
@@ -946,14 +923,10 @@ int octeon_unregister_droq_ops(struct oc
 		return 0;
 	}
 
-	spin_lock_irqsave(&droq->lock, flags);
-
 	droq->ops.fptr = NULL;
 	droq->ops.farg = NULL;
 	droq->ops.drop_on_max = 0;
 
-	spin_unlock_irqrestore(&droq->lock, flags);
-
 	return 0;
 }
 
--- a/drivers/net/ethernet/cavium/liquidio/octeon_droq.h
+++ b/drivers/net/ethernet/cavium/liquidio/octeon_droq.h
@@ -245,9 +245,6 @@ struct octeon_droq_ops {
  *  Octeon DROQ.
  */
 struct octeon_droq {
-	/** A spinlock to protect access to this ring. */
-	spinlock_t lock;
-
 	u32 q_no;
 
 	u32 pkt_count;