Commit a12f801d authored by Sandeep Gopalpet's avatar Sandeep Gopalpet Committed by David S. Miller
Browse files

gianfar: Add per queue structure support 



This patch introduces per tx and per rx queue structures.
Earlier the members of these structures were inside the
gfar_private structure.

Moving forward if we want to support multiple queues, we need
to refactor the gfar_private structure so that introduction of
multiple queues is easier.

Signed-off-by: default avatarSandeep Gopalpet <Sandeep.Kumar@freescale.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 123b43e9

drivers/net/gianfar.c

+228 −156

File changed.

Preview size limit exceeded, changes collapsed.

drivers/net/gianfar.h

+75 −41
Original line number Diff line number Diff line
@@ -7,8 +7,9 @@ 
 *

 * Author: Andy Fleming

 * Maintainer: Kumar Gala

 * Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com>

 *

 * Copyright (c) 2002-2004 Freescale Semiconductor, Inc.

 * Copyright 2002-2009 Freescale Semiconductor, Inc.

 *

 * This program is free software; you can redistribute  it and/or modify it

 * under  the terms of  the GNU General  Public License as published by the
@@ -699,62 +700,95 @@ struct gfar { 
#define FSL_GIANFAR_DEV_HAS_BD_STASHING		0x00000200

#define FSL_GIANFAR_DEV_HAS_BUF_STASHING	0x00000400



/* Struct stolen almost completely (and shamelessly) from the FCC enet source

 * (Ok, that's not so true anymore, but there is a family resemblence)

 * The GFAR buffer descriptors track the ring buffers.  The rx_bd_base

 * and tx_bd_base always point to the currently available buffer.

 * The dirty_tx tracks the current buffer that is being sent by the

 * controller.  The cur_tx and dirty_tx are equal under both completely

 * empty and completely full conditions.  The empty/ready indicator in

 * the buffer descriptor determines the actual condition.

/**

 *	struct gfar_priv_tx_q - per tx queue structure

 *	@txlock: per queue tx spin lock

 *	@tx_skbuff:skb pointers

 *	@skb_curtx: to be used skb pointer

 *	@skb_dirtytx:the last used skb pointer

 *	@qindex: index of this queue

 *	@dev: back pointer to the dev structure

 *	@grp: back pointer to the group to which this queue belongs

 *	@tx_bd_base: First tx buffer descriptor

 *	@cur_tx: Next free ring entry

 *	@dirty_tx: First buffer in line to be transmitted

 *	@tx_ring_size: Tx ring size

 *	@num_txbdfree: number of free TxBds

 *	@txcoalescing: enable/disable tx coalescing

 *	@txic: transmit interrupt coalescing value

 *	@txcount: coalescing value if based on tx frame count

 *	@txtime: coalescing value if based on time

 */

struct gfar_private {

	/* Fields controlled by TX lock */

	spinlock_t txlock;



	/* Pointer to the array of skbuffs */

struct gfar_priv_tx_q {

	spinlock_t txlock __attribute__ ((aligned (SMP_CACHE_BYTES)));

	struct sk_buff ** tx_skbuff;



	/* next free skb in the array */

	/* Buffer descriptor pointers */

	dma_addr_t tx_bd_dma_base;

	struct	txbd8 *tx_bd_base;

	struct	txbd8 *cur_tx;

	struct	txbd8 *dirty_tx;

	struct	net_device *dev;

	u16	skb_curtx;



	/* First skb in line to be transmitted */

	u16	skb_dirtytx;



	u16	qindex;

	unsigned int tx_ring_size;

	unsigned int num_txbdfree;

	/* Configuration info for the coalescing features */

	unsigned char txcoalescing;

	unsigned long txic;

	unsigned short txcount;

	unsigned short txtime;

};



	/* Buffer descriptor pointers */

	dma_addr_t tx_bd_dma_base;

	struct txbd8 *tx_bd_base;	/* First tx buffer descriptor */

	struct txbd8 *cur_tx;	        /* Next free ring entry */

	struct txbd8 *dirty_tx;		/* First buffer in line

					   to be transmitted */

	unsigned int tx_ring_size;

	unsigned int num_txbdfree;	/* number of TxBDs free */



	/* RX Locked fields */

	spinlock_t rxlock;

/**

 *	struct gfar_priv_rx_q - per rx queue structure

 *	@rxlock: per queue rx spin lock

 *	@napi: the napi poll function

 *	@rx_skbuff: skb pointers

 *	@skb_currx: currently use skb pointer

 *	@rx_bd_base: First rx buffer descriptor

 *	@cur_rx: Next free rx ring entry

 *	@qindex: index of this queue

 *	@dev: back pointer to the dev structure

 *	@rx_ring_size: Rx ring size

 *	@rxcoalescing: enable/disable rx-coalescing

 *	@rxic: receive interrupt coalescing vlaue

 */



	struct device_node *node;

	struct net_device *ndev;

	struct of_device *ofdev;

struct gfar_priv_rx_q {

	spinlock_t rxlock __attribute__ ((aligned (SMP_CACHE_BYTES)));

	struct	napi_struct napi;



	/* skb array and index */

	struct	sk_buff ** rx_skbuff;

	struct	rxbd8 *rx_bd_base;

	struct	rxbd8 *cur_rx;

	struct	net_device *dev;

	u16	skb_currx;



	u16	qindex;

	unsigned int	rx_ring_size;

	/* RX Coalescing values */

	unsigned char rxcoalescing;

	unsigned long rxic;

};



/* Struct stolen almost completely (and shamelessly) from the FCC enet source

 * (Ok, that's not so true anymore, but there is a family resemblence)

 * The GFAR buffer descriptors track the ring buffers.  The rx_bd_base

 * and tx_bd_base always point to the currently available buffer.

 * The dirty_tx tracks the current buffer that is being sent by the

 * controller.  The cur_tx and dirty_tx are equal under both completely

 * empty and completely full conditions.  The empty/ready indicator in

 * the buffer descriptor determines the actual condition.

 */

struct gfar_private {



	struct rxbd8 *rx_bd_base;	/* First Rx buffers */

	struct rxbd8 *cur_rx;           /* Next free rx ring entry */

	struct device_node *node;

	struct net_device *ndev;

	struct of_device *ofdev;



	/* RX parameters */

	unsigned int rx_ring_size;

	struct gfar_priv_tx_q *tx_queue;

	struct gfar_priv_rx_q *rx_queue;



	/* RX per device parameters */

	unsigned int rx_buffer_size;

	unsigned int rx_stash_size;

	unsigned int rx_stash_index;

drivers/net/gianfar_ethtool.c

+65 −35
Original line number Diff line number Diff line
@@ -7,8 +7,9 @@ 
 *

 *  Author: Andy Fleming

 *  Maintainer: Kumar Gala

 *  Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com>

 *

 *  Copyright (c) 2003,2004 Freescale Semiconductor, Inc.

 *  Copyright 2003-2006, 2008-2009 Freescale Semiconductor, Inc.

 *

 *  This software may be used and distributed according to

 *  the terms of the GNU Public License, Version 2, incorporated herein
@@ -41,7 +42,7 @@ 
#include "gianfar.h"



extern void gfar_start(struct net_device *dev);

extern int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit);

extern int gfar_clean_rx_ring(struct gfar_priv_rx_q *rx_queue, int rx_work_limit);



#define GFAR_MAX_COAL_USECS 0xffff

#define GFAR_MAX_COAL_FRAMES 0xff
@@ -197,12 +198,16 @@ static int gfar_gsettings(struct net_device *dev, struct ethtool_cmd *cmd) 
{

	struct gfar_private *priv = netdev_priv(dev);

	struct phy_device *phydev = priv->phydev;

	struct gfar_priv_rx_q *rx_queue = NULL;

	struct gfar_priv_tx_q *tx_queue = NULL;



	if (NULL == phydev)

		return -ENODEV;

	tx_queue = priv->tx_queue;

	rx_queue = priv->rx_queue;



	cmd->maxtxpkt = get_icft_value(priv->txic);

	cmd->maxrxpkt = get_icft_value(priv->rxic);

	cmd->maxtxpkt = get_icft_value(tx_queue->txic);

	cmd->maxrxpkt = get_icft_value(rx_queue->rxic);



	return phy_ethtool_gset(phydev, cmd);

}
@@ -279,6 +284,8 @@ static unsigned int gfar_ticks2usecs(struct gfar_private *priv, unsigned int tic 
static int gfar_gcoalesce(struct net_device *dev, struct ethtool_coalesce *cvals)

{

	struct gfar_private *priv = netdev_priv(dev);

	struct gfar_priv_rx_q *rx_queue = NULL;

	struct gfar_priv_tx_q *tx_queue = NULL;

	unsigned long rxtime;

	unsigned long rxcount;

	unsigned long txtime;
@@ -290,10 +297,13 @@ static int gfar_gcoalesce(struct net_device *dev, struct ethtool_coalesce *cvals 
	if (NULL == priv->phydev)

		return -ENODEV;



	rxtime  = get_ictt_value(priv->rxic);

	rxcount = get_icft_value(priv->rxic);

	txtime  = get_ictt_value(priv->txic);

	txcount = get_icft_value(priv->txic);

	rx_queue = priv->rx_queue;

	tx_queue = priv->tx_queue;



	rxtime  = get_ictt_value(rx_queue->rxic);

	rxcount = get_icft_value(rx_queue->rxic);

	txtime  = get_ictt_value(tx_queue->txic);

	txcount = get_icft_value(tx_queue->txic);

	cvals->rx_coalesce_usecs = gfar_ticks2usecs(priv, rxtime);

	cvals->rx_max_coalesced_frames = rxcount;
@@ -339,16 +349,21 @@ static int gfar_gcoalesce(struct net_device *dev, struct ethtool_coalesce *cvals 
static int gfar_scoalesce(struct net_device *dev, struct ethtool_coalesce *cvals)

{

	struct gfar_private *priv = netdev_priv(dev);

	struct gfar_priv_tx_q *tx_queue = NULL;

	struct gfar_priv_rx_q *rx_queue = NULL;



	if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_COALESCE))

		return -EOPNOTSUPP;



	tx_queue = priv->tx_queue;

	rx_queue = priv->rx_queue;



	/* Set up rx coalescing */

	if ((cvals->rx_coalesce_usecs == 0) ||

	    (cvals->rx_max_coalesced_frames == 0))

		priv->rxcoalescing = 0;

		rx_queue->rxcoalescing = 0;

	else

		priv->rxcoalescing = 1;

		rx_queue->rxcoalescing = 1;



	if (NULL == priv->phydev)

		return -ENODEV;
@@ -366,15 +381,15 @@ static int gfar_scoalesce(struct net_device *dev, struct ethtool_coalesce *cvals 
		return -EINVAL;

	}



	priv->rxic = mk_ic_value(cvals->rx_max_coalesced_frames,

	rx_queue->rxic = mk_ic_value(cvals->rx_max_coalesced_frames,

		gfar_usecs2ticks(priv, cvals->rx_coalesce_usecs));



	/* Set up tx coalescing */

	if ((cvals->tx_coalesce_usecs == 0) ||

	    (cvals->tx_max_coalesced_frames == 0))

		priv->txcoalescing = 0;

		tx_queue->txcoalescing = 0;

	else

		priv->txcoalescing = 1;

		tx_queue->txcoalescing = 1;



	/* Check the bounds of the values */

	if (cvals->tx_coalesce_usecs > GFAR_MAX_COAL_USECS) {
@@ -389,16 +404,16 @@ static int gfar_scoalesce(struct net_device *dev, struct ethtool_coalesce *cvals 
		return -EINVAL;

	}



	priv->txic = mk_ic_value(cvals->tx_max_coalesced_frames,

	tx_queue->txic = mk_ic_value(cvals->tx_max_coalesced_frames,

		gfar_usecs2ticks(priv, cvals->tx_coalesce_usecs));



	gfar_write(&priv->regs->rxic, 0);

	if (priv->rxcoalescing)

		gfar_write(&priv->regs->rxic, priv->rxic);

	if (rx_queue->rxcoalescing)

		gfar_write(&priv->regs->rxic, rx_queue->rxic);



	gfar_write(&priv->regs->txic, 0);

	if (priv->txcoalescing)

		gfar_write(&priv->regs->txic, priv->txic);

	if (tx_queue->txcoalescing)

		gfar_write(&priv->regs->txic, tx_queue->txic);



	return 0;

}
@@ -409,6 +424,11 @@ static int gfar_scoalesce(struct net_device *dev, struct ethtool_coalesce *cvals 
static void gfar_gringparam(struct net_device *dev, struct ethtool_ringparam *rvals)

{

	struct gfar_private *priv = netdev_priv(dev);

	struct gfar_priv_tx_q *tx_queue = NULL;

	struct gfar_priv_rx_q *rx_queue = NULL;



	tx_queue = priv->tx_queue;

	rx_queue = priv->rx_queue;



	rvals->rx_max_pending = GFAR_RX_MAX_RING_SIZE;

	rvals->rx_mini_max_pending = GFAR_RX_MAX_RING_SIZE;
@@ -418,10 +438,10 @@ static void gfar_gringparam(struct net_device *dev, struct ethtool_ringparam *rv 
	/* Values changeable by the user.  The valid values are

	 * in the range 1 to the "*_max_pending" counterpart above.

	 */

	rvals->rx_pending = priv->rx_ring_size;

	rvals->rx_mini_pending = priv->rx_ring_size;

	rvals->rx_jumbo_pending = priv->rx_ring_size;

	rvals->tx_pending = priv->tx_ring_size;

	rvals->rx_pending = rx_queue->rx_ring_size;

	rvals->rx_mini_pending = rx_queue->rx_ring_size;

	rvals->rx_jumbo_pending = rx_queue->rx_ring_size;

	rvals->tx_pending = tx_queue->tx_ring_size;

}



/* Change the current ring parameters, stopping the controller if
@@ -431,6 +451,8 @@ static void gfar_gringparam(struct net_device *dev, struct ethtool_ringparam *rv 
static int gfar_sringparam(struct net_device *dev, struct ethtool_ringparam *rvals)

{

	struct gfar_private *priv = netdev_priv(dev);

	struct gfar_priv_tx_q *tx_queue = NULL;

	struct gfar_priv_rx_q *rx_queue = NULL;

	int err = 0;



	if (rvals->rx_pending > GFAR_RX_MAX_RING_SIZE)
@@ -451,29 +473,32 @@ static int gfar_sringparam(struct net_device *dev, struct ethtool_ringparam *rva 
		return -EINVAL;

	}



	tx_queue = priv->tx_queue;

	rx_queue = priv->rx_queue;



	if (dev->flags & IFF_UP) {

		unsigned long flags;



		/* Halt TX and RX, and process the frames which

		 * have already been received */

		spin_lock_irqsave(&priv->txlock, flags);

		spin_lock(&priv->rxlock);

		spin_lock_irqsave(&tx_queue->txlock, flags);

		spin_lock(&rx_queue->rxlock);



		gfar_halt(dev);



		spin_unlock(&priv->rxlock);

		spin_unlock_irqrestore(&priv->txlock, flags);

		spin_unlock(&rx_queue->rxlock);

		spin_unlock_irqrestore(&tx_queue->txlock, flags);



		gfar_clean_rx_ring(dev, priv->rx_ring_size);

		gfar_clean_rx_ring(rx_queue, rx_queue->rx_ring_size);



		/* Now we take down the rings to rebuild them */

		stop_gfar(dev);

	}



	/* Change the size */

	priv->rx_ring_size = rvals->rx_pending;

	priv->tx_ring_size = rvals->tx_pending;

	priv->num_txbdfree = priv->tx_ring_size;

	rx_queue->rx_ring_size = rvals->rx_pending;

	tx_queue->tx_ring_size = rvals->tx_pending;

	tx_queue->num_txbdfree = tx_queue->tx_ring_size;



	/* Rebuild the rings with the new size */

	if (dev->flags & IFF_UP) {
@@ -486,24 +511,29 @@ static int gfar_sringparam(struct net_device *dev, struct ethtool_ringparam *rva 
static int gfar_set_rx_csum(struct net_device *dev, uint32_t data)

{

	struct gfar_private *priv = netdev_priv(dev);

	struct gfar_priv_rx_q *rx_queue = NULL;

	struct gfar_priv_tx_q *tx_queue = NULL;

	unsigned long flags;

	int err = 0;



	if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_CSUM))

		return -EOPNOTSUPP;



	tx_queue = priv->tx_queue;

	rx_queue = priv->rx_queue;



	if (dev->flags & IFF_UP) {

		/* Halt TX and RX, and process the frames which

		 * have already been received */

		spin_lock_irqsave(&priv->txlock, flags);

		spin_lock(&priv->rxlock);

		spin_lock_irqsave(&tx_queue->txlock, flags);

		spin_lock(&rx_queue->rxlock);



		gfar_halt(dev);



		spin_unlock(&priv->rxlock);

		spin_unlock_irqrestore(&priv->txlock, flags);

		spin_unlock(&rx_queue->rxlock);

		spin_unlock_irqrestore(&tx_queue->txlock, flags);



		gfar_clean_rx_ring(dev, priv->rx_ring_size);

		gfar_clean_rx_ring(rx_queue, rx_queue->rx_ring_size);



		/* Now we take down the rings to rebuild them */

		stop_gfar(dev);

drivers/net/gianfar_sysfs.c

+30 −13
Original line number Diff line number Diff line
@@ -8,8 +8,9 @@ 
 *

 * Author: Andy Fleming

 * Maintainer: Kumar Gala (galak@kernel.crashing.org)

 * Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com>

 *

 * Copyright (c) 2002-2005 Freescale Semiconductor, Inc.

 * Copyright 2002-2009 Freescale Semiconductor, Inc.

 *

 * This program is free software; you can redistribute  it and/or modify it

 * under  the terms of  the GNU General  Public License as published by the
@@ -49,6 +50,7 @@ static ssize_t gfar_set_bd_stash(struct device *dev, 
				 const char *buf, size_t count)

{

	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

	struct gfar_priv_rx_q *rx_queue = NULL;

	int new_setting = 0;

	u32 temp;

	unsigned long flags;
@@ -56,6 +58,8 @@ static ssize_t gfar_set_bd_stash(struct device *dev, 
	if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BD_STASHING))

		return count;



	rx_queue = priv->rx_queue;



	/* Find out the new setting */

	if (!strncmp("on", buf, count - 1) || !strncmp("1", buf, count - 1))

		new_setting = 1;
@@ -65,7 +69,7 @@ static ssize_t gfar_set_bd_stash(struct device *dev, 
	else

		return count;



	spin_lock_irqsave(&priv->rxlock, flags);

	spin_lock_irqsave(&rx_queue->rxlock, flags);



	/* Set the new stashing value */

	priv->bd_stash_en = new_setting;
@@ -79,7 +83,7 @@ static ssize_t gfar_set_bd_stash(struct device *dev, 


	gfar_write(&priv->regs->attr, temp);



	spin_unlock_irqrestore(&priv->rxlock, flags);

	spin_unlock_irqrestore(&rx_queue->rxlock, flags);



	return count;

}
@@ -99,6 +103,7 @@ static ssize_t gfar_set_rx_stash_size(struct device *dev, 
				      const char *buf, size_t count)

{

	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

	struct gfar_priv_rx_q *rx_queue = NULL;

	unsigned int length = simple_strtoul(buf, NULL, 0);

	u32 temp;

	unsigned long flags;
@@ -106,7 +111,9 @@ static ssize_t gfar_set_rx_stash_size(struct device *dev, 
	if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BUF_STASHING))

		return count;



	spin_lock_irqsave(&priv->rxlock, flags);

	rx_queue = priv->rx_queue;



	spin_lock_irqsave(&rx_queue->rxlock, flags);

	if (length > priv->rx_buffer_size)

		goto out;
@@ -131,7 +138,7 @@ static ssize_t gfar_set_rx_stash_size(struct device *dev, 
	gfar_write(&priv->regs->attr, temp);



out:

	spin_unlock_irqrestore(&priv->rxlock, flags);

	spin_unlock_irqrestore(&rx_queue->rxlock, flags);



	return count;

}
@@ -154,6 +161,7 @@ static ssize_t gfar_set_rx_stash_index(struct device *dev, 
				       const char *buf, size_t count)

{

	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

	struct gfar_priv_rx_q *rx_queue = NULL;

	unsigned short index = simple_strtoul(buf, NULL, 0);

	u32 temp;

	unsigned long flags;
@@ -161,7 +169,9 @@ static ssize_t gfar_set_rx_stash_index(struct device *dev, 
	if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BUF_STASHING))

		return count;



	spin_lock_irqsave(&priv->rxlock, flags);

	rx_queue = priv->rx_queue;



	spin_lock_irqsave(&rx_queue->rxlock, flags);

	if (index > priv->rx_stash_size)

		goto out;
@@ -176,7 +186,7 @@ static ssize_t gfar_set_rx_stash_index(struct device *dev, 
	gfar_write(&priv->regs->attreli, flags);



out:

	spin_unlock_irqrestore(&priv->rxlock, flags);

	spin_unlock_irqrestore(&rx_queue->rxlock, flags);



	return count;

}
@@ -198,6 +208,7 @@ static ssize_t gfar_set_fifo_threshold(struct device *dev, 
				       const char *buf, size_t count)

{

	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

	struct gfar_priv_tx_q *tx_queue = NULL;

	unsigned int length = simple_strtoul(buf, NULL, 0);

	u32 temp;

	unsigned long flags;
@@ -205,7 +216,9 @@ static ssize_t gfar_set_fifo_threshold(struct device *dev, 
	if (length > GFAR_MAX_FIFO_THRESHOLD)

		return count;



	spin_lock_irqsave(&priv->txlock, flags);

	tx_queue = priv->tx_queue;



	spin_lock_irqsave(&tx_queue->txlock, flags);



	priv->fifo_threshold = length;
@@ -214,7 +227,7 @@ static ssize_t gfar_set_fifo_threshold(struct device *dev, 
	temp |= length;

	gfar_write(&priv->regs->fifo_tx_thr, temp);



	spin_unlock_irqrestore(&priv->txlock, flags);

	spin_unlock_irqrestore(&tx_queue->txlock, flags);



	return count;

}
@@ -235,6 +248,7 @@ static ssize_t gfar_set_fifo_starve(struct device *dev, 
				    const char *buf, size_t count)

{

	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

	struct gfar_priv_tx_q *tx_queue = NULL;

	unsigned int num = simple_strtoul(buf, NULL, 0);

	u32 temp;

	unsigned long flags;
@@ -242,7 +256,8 @@ static ssize_t gfar_set_fifo_starve(struct device *dev, 
	if (num > GFAR_MAX_FIFO_STARVE)

		return count;



	spin_lock_irqsave(&priv->txlock, flags);

	tx_queue = priv->tx_queue;

	spin_lock_irqsave(&tx_queue->txlock, flags);



	priv->fifo_starve = num;
@@ -251,7 +266,7 @@ static ssize_t gfar_set_fifo_starve(struct device *dev, 
	temp |= num;

	gfar_write(&priv->regs->fifo_tx_starve, temp);



	spin_unlock_irqrestore(&priv->txlock, flags);

	spin_unlock_irqrestore(&tx_queue->txlock, flags);



	return count;

}
@@ -273,6 +288,7 @@ static ssize_t gfar_set_fifo_starve_off(struct device *dev, 
					const char *buf, size_t count)

{

	struct gfar_private *priv = netdev_priv(to_net_dev(dev));

	struct gfar_priv_tx_q *tx_queue = NULL;

	unsigned int num = simple_strtoul(buf, NULL, 0);

	u32 temp;

	unsigned long flags;
@@ -280,7 +296,8 @@ static ssize_t gfar_set_fifo_starve_off(struct device *dev, 
	if (num > GFAR_MAX_FIFO_STARVE_OFF)

		return count;



	spin_lock_irqsave(&priv->txlock, flags);

	tx_queue = priv->tx_queue;

	spin_lock_irqsave(&tx_queue->txlock, flags);



	priv->fifo_starve_off = num;
@@ -289,7 +306,7 @@ static ssize_t gfar_set_fifo_starve_off(struct device *dev, 
	temp |= num;

	gfar_write(&priv->regs->fifo_tx_starve_shutoff, temp);



	spin_unlock_irqrestore(&priv->txlock, flags);

	spin_unlock_irqrestore(&tx_queue->txlock, flags);



	return count;

}

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