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@semihalf.com>
Reported-by: Alexandre Fournier <alexandre.fournier@wisp-e.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/marvell/mvpp2.c b/drivers/net/ethernet/marvell/mvpp2.c
index 3e8b1bfb1f2e316212bd9b60fa06522ca4dc68db..f94bd122f0bd53c86cc3cc1f022f055d0bed2588 100644 (file)
--- 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,