netdev - [PATCH 1/3] net: mvpp2: remove excessive spinlocks from driver initialization

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Message-Id: <1438880430-5480-2-git-send-email-mw@semihalf.com>
Date:	Thu,  6 Aug 2015 19:00:28 +0200
From:	Marcin Wojtas <mw@...ihalf.com>
To:	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org
Cc:	davem@...emloft.net, jason@...edaemon.net,
	thomas.petazzoni@...e-electrons.com,
	gregory.clement@...e-electrons.com,
	ezequiel.garcia@...e-electrons.com, alior@...vell.com,
	jaz@...ihalf.com, Marcin Wojtas <mw@...ihalf.com>
Subject: [PATCH 1/3] net: mvpp2: remove excessive spinlocks from driver initialization

Using spinlocks protection during one-time driver initialization is not
necessary. Moreover it resulted in invalid GFP_KERNEL allocation under the lock.

This commit removes redundant spinlocks from buffer manager part of mvpp2
initialization.

Signed-off-by: Marcin Wojtas <mw@...ihalf.com>
Reported-by: Alexandre Fournier <alexandre.fournier@...p-e.com>
---
 drivers/net/ethernet/marvell/mvpp2.c | 15 ---------------
 1 file changed, 15 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2.c b/drivers/net/ethernet/marvell/mvpp2.c
index 3e8b1bf..f94bd12 100644
--- a/drivers/net/ethernet/marvell/mvpp2.c
+++ b/drivers/net/ethernet/marvell/mvpp2.c
@@ -913,8 +913,6 @@ struct mvpp2_bm_pool {
 	/* Occupied buffers indicator */
 	atomic_t in_use;
 	int in_use_thresh;
-
-	spinlock_t lock;
 };
 
 struct mvpp2_buff_hdr {
@@ -3376,7 +3374,6 @@ static int mvpp2_bm_pool_create(struct platform_device *pdev,
 	bm_pool->pkt_size = 0;
 	bm_pool->buf_num = 0;
 	atomic_set(&bm_pool->in_use, 0);
-	spin_lock_init(&bm_pool->lock);
 
 	return 0;
 }
@@ -3647,7 +3644,6 @@ static struct mvpp2_bm_pool *
 mvpp2_bm_pool_use(struct mvpp2_port *port, int pool, enum mvpp2_bm_type type,
 		  int pkt_size)
 {
-	unsigned long flags = 0;
 	struct mvpp2_bm_pool *new_pool = &port->priv->bm_pools[pool];
 	int num;
 
@@ -3656,8 +3652,6 @@ mvpp2_bm_pool_use(struct mvpp2_port *port, int pool, enum mvpp2_bm_type type,
 		return NULL;
 	}
 
-	spin_lock_irqsave(&new_pool->lock, flags);
-
 	if (new_pool->type == MVPP2_BM_FREE)
 		new_pool->type = type;
 
@@ -3686,8 +3680,6 @@ mvpp2_bm_pool_use(struct mvpp2_port *port, int pool, enum mvpp2_bm_type type,
 		if (num != pkts_num) {
 			WARN(1, "pool %d: %d of %d allocated\n",
 			     new_pool->id, num, pkts_num);
-			/* We need to undo the bufs_add() allocations */
-			spin_unlock_irqrestore(&new_pool->lock, flags);
 			return NULL;
 		}
 	}
@@ -3695,15 +3687,12 @@ mvpp2_bm_pool_use(struct mvpp2_port *port, int pool, enum mvpp2_bm_type type,
 	mvpp2_bm_pool_bufsize_set(port->priv, new_pool,
 				  MVPP2_RX_BUF_SIZE(new_pool->pkt_size));
 
-	spin_unlock_irqrestore(&new_pool->lock, flags);
-
 	return new_pool;
 }
 
 /* Initialize pools for swf */
 static int mvpp2_swf_bm_pool_init(struct mvpp2_port *port)
 {
-	unsigned long flags = 0;
 	int rxq;
 
 	if (!port->pool_long) {
@@ -3714,9 +3703,7 @@ static int mvpp2_swf_bm_pool_init(struct mvpp2_port *port)
 		if (!port->pool_long)
 			return -ENOMEM;
 
-		spin_lock_irqsave(&port->pool_long->lock, flags);
 		port->pool_long->port_map |= (1 << port->id);
-		spin_unlock_irqrestore(&port->pool_long->lock, flags);
 
 		for (rxq = 0; rxq < rxq_number; rxq++)
 			mvpp2_rxq_long_pool_set(port, rxq, port->pool_long->id);
@@ -3730,9 +3717,7 @@ static int mvpp2_swf_bm_pool_init(struct mvpp2_port *port)
 		if (!port->pool_short)
 			return -ENOMEM;
 
-		spin_lock_irqsave(&port->pool_short->lock, flags);
 		port->pool_short->port_map |= (1 << port->id);
-		spin_unlock_irqrestore(&port->pool_short->lock, flags);
 
 		for (rxq = 0; rxq < rxq_number; rxq++)
 			mvpp2_rxq_short_pool_set(port, rxq,
-- 
1.8.3.1

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