cregit-Linux how code gets into the kernel

Release 4.18 drivers/net/ethernet/cirrus/mac89x0.c

Directory: drivers/net/ethernet/cirrus
/* mac89x0.c: A Crystal Semiconductor CS89[02]0 driver for linux. */
/*
        Written 1996 by Russell Nelson, with reference to skeleton.c
        written 1993-1994 by Donald Becker.

        This software may be used and distributed according to the terms
        of the GNU General Public License, incorporated herein by reference.

        The author may be reached at nelson@crynwr.com, Crynwr
        Software, 11 Grant St., Potsdam, NY 13676

  Changelog:

  Mike Cruse        : mcruse@cti-ltd.com
                    : Changes for Linux 2.0 compatibility.
                    : Added dev_id parameter in net_interrupt(),
                    : request_irq() and free_irq(). Just NULL for now.

  Mike Cruse        : Added MOD_INC_USE_COUNT and MOD_DEC_USE_COUNT macros
                    : in net_open() and net_close() so kerneld would know
                    : that the module is in use and wouldn't eject the
                    : driver prematurely.

  Mike Cruse        : Rewrote init_module() and cleanup_module using 8390.c
                    : as an example. Disabled autoprobing in init_module(),
                    : not a good thing to do to other devices while Linux
                    : is running from all accounts.

  Alan Cox          : Removed 1.2 support, added 2.1 extra counters.

  David Huggins-Daines <dhd@debian.org>

  Split this off into mac89x0.c, and gutted it of all parts which are
  not relevant to the existing CS8900 cards on the Macintosh
  (i.e. basically the Daynaport CS and LC cards).  To be precise:

    * Removed all the media-detection stuff, because these cards are
    TP-only.

    * Lobotomized the ISA interrupt bogosity, because these cards use
    a hardwired NuBus interrupt and a magic ISAIRQ value in the card.

    * Basically eliminated everything not relevant to getting the
    cards minimally functioning on the Macintosh.

  I might add that these cards are badly designed even from the Mac
  standpoint, in that Dayna, in their infinite wisdom, used NuBus slot
  I/O space and NuBus interrupts for these cards, but neglected to
  provide anything even remotely resembling a NuBus ROM.  Therefore we
  have to probe for them in a brain-damaged ISA-like fashion.

  Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 11/01/2001
  check kmalloc and release the allocated memory on failure in
  mac89x0_probe and in init_module
  use local_irq_{save,restore}(flags) in net_get_stat, not just
  local_irq_{dis,en}able()
*/


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt


static const char version[] =
"cs89x0.c:v1.02 11/26/96 Russell Nelson <nelson@crynwr.com>\n";

#include <linux/module.h>

/*
  Sources:

        Crynwr packet driver epktisa.

        Crystal Semiconductor data sheets.

*/

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/string.h>
#include <linux/nubus.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/platform_device.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <linux/gfp.h>

#include <asm/io.h>
#include <asm/hwtest.h>
#include <asm/macints.h>

#include "cs89x0.h"


static int debug = -1;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "debug message level");

/* Information that need to be kept for each board. */

struct net_local {
	
int msg_enable;
	
int chip_type;		/* one of: CS8900, CS8920, CS8920M */
	
char chip_revision;	/* revision letter of the chip ('A'...) */
	
int send_cmd;		/* the propercommand used to send a packet. */
	
int rx_mode;
	
int curr_rx_cfg;
        
int send_underrun;      /* keep track of how many underruns in a row we get */
};

/* Index to functions, as function prototypes. */
static int net_open(struct net_device *dev);
static int net_send_packet(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t net_interrupt(int irq, void *dev_id);
static void set_multicast_list(struct net_device *dev);
static void net_rx(struct net_device *dev);
static int net_close(struct net_device *dev);
static struct net_device_stats *net_get_stats(struct net_device *dev);
static int set_mac_address(struct net_device *dev, void *addr);

/* For reading/writing registers ISA-style */


static inline int

readreg_io(struct net_device *dev, int portno)
{
	nubus_writew(swab16(portno), dev->base_addr + ADD_PORT);
	return swab16(nubus_readw(dev->base_addr + DATA_PORT));
}


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Geert Uytterhoeven24.76%133.33%


Dave Jones12.38%133.33%


Total42100.00%3100.00%





static inline void

writereg_io(struct net_device *dev, int portno, int value)
{
	nubus_writew(swab16(portno), dev->base_addr + ADD_PORT);
	nubus_writew(swab16(value), dev->base_addr + DATA_PORT);
}


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Geert Uytterhoeven24.35%133.33%


Dave Jones12.17%133.33%


Total46100.00%3100.00%



/* These are for reading/writing registers in shared memory */


static inline int

readreg(struct net_device *dev, int portno)
{
	return swab16(nubus_readw(dev->mem_start + portno));
}


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Geert Uytterhoeven13.57%133.33%


Dave Jones13.57%133.33%


Total28100.00%3100.00%





static inline void

writereg(struct net_device *dev, int portno, int value)
{
	nubus_writew(swab16(value), dev->mem_start + portno);
}


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Dave Jones13.12%133.33%


Geert Uytterhoeven13.12%133.33%


Total32100.00%3100.00%




static const struct net_device_ops mac89x0_netdev_ops = {
	.ndo_open		= net_open,
	.ndo_stop		= net_close,
	.ndo_start_xmit		= net_send_packet,
	.ndo_get_stats		= net_get_stats,
	.ndo_set_rx_mode	= set_multicast_list,
	.ndo_set_mac_address	= set_mac_address,
	.ndo_validate_addr	= eth_validate_addr,
};

/* Probe for the CS8900 card in slot E.  We won't bother looking
   anywhere else until we have a really good reason to do so. */



static int mac89x0_device_probe(struct platform_device *pdev)
{
	struct net_device *dev;
	struct net_local *lp;
	int i, slot;
	unsigned rev_type = 0;
	unsigned long ioaddr;
	unsigned short sig;
	int err = -ENODEV;
	struct nubus_rsrc *fres;

	dev = alloc_etherdev(sizeof(struct net_local));
	if (!dev)
		return -ENOMEM;

	/* We might have to parameterize this later */
	slot = 0xE;
	/* Get out now if there's a real NuBus card in slot E */
	for_each_func_rsrc(fres)
		if (fres->board->slot == slot)
			goto out;

	/* The pseudo-ISA bits always live at offset 0x300 (gee,
           wonder why...) */
	ioaddr = (unsigned long)
		nubus_slot_addr(slot) | (((slot&0xf) << 20) + DEFAULTIOBASE);
	{
		int card_present;

		card_present = (hwreg_present((void *)ioaddr + 4) &&
				hwreg_present((void *)ioaddr + DATA_PORT));
		if (!card_present)
			goto out;
	}

	nubus_writew(0, ioaddr + ADD_PORT);
	sig = nubus_readw(ioaddr + DATA_PORT);
	if (sig != swab16(CHIP_EISA_ID_SIG))
		goto out;

	SET_NETDEV_DEV(dev, &pdev->dev);

	/* Initialize the net_device structure. */
	lp = netdev_priv(dev);

	lp->msg_enable = netif_msg_init(debug, 0);

	/* Fill in the 'dev' fields. */
	dev->base_addr = ioaddr;
	dev->mem_start = (unsigned long)
		nubus_slot_addr(slot) | (((slot&0xf) << 20) + MMIOBASE);
	dev->mem_end = dev->mem_start + 0x1000;

	/* Turn on shared memory */
	writereg_io(dev, PP_BusCTL, MEMORY_ON);

	/* get the chip type */
	rev_type = readreg(dev, PRODUCT_ID_ADD);
	lp->chip_type = rev_type &~ REVISON_BITS;
	lp->chip_revision = ((rev_type & REVISON_BITS) >> 8) + 'A';

	/* Check the chip type and revision in order to set the correct send command
        CS8920 revision C and CS8900 revision F can use the faster send. */
	lp->send_cmd = TX_AFTER_381;
	if (lp->chip_type == CS8900 && lp->chip_revision >= 'F')
		lp->send_cmd = TX_NOW;
	if (lp->chip_type != CS8900 && lp->chip_revision >= 'C')
		lp->send_cmd = TX_NOW;

	netif_dbg(lp, drv, dev, "%s", version);

	pr_info("cs89%c0%s rev %c found at %#8lx\n",
		lp->chip_type == CS8900 ? '0' : '2',
		lp->chip_type == CS8920M ? "M" : "",
		lp->chip_revision, dev->base_addr);

	/* Try to read the MAC address */
	if ((readreg(dev, PP_SelfST) & (EEPROM_PRESENT | EEPROM_OK)) == 0) {
		pr_info("No EEPROM, giving up now.\n");
		goto out1;
        } else {
                for (i = 0; i < ETH_ALEN; i += 2) {
			/* Big-endian (why??!) */
			unsigned short s = readreg(dev, PP_IA + i);
                        dev->dev_addr[i] = s >> 8;
                        dev->dev_addr[i+1] = s & 0xff;
                }
        }

	dev->irq = SLOT2IRQ(slot);

	/* print the IRQ and ethernet address. */

	pr_info("MAC %pM, IRQ %d\n", dev->dev_addr, dev->irq);

	dev->netdev_ops		= &mac89x0_netdev_ops;

	err = register_netdev(dev);
	if (err)
		goto out1;

	platform_set_drvdata(pdev, dev);
	return 0;
out1:
	nubus_writew(0, dev->base_addr + ADD_PORT);
out:
	free_netdev(dev);
	return err;
}


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Linus Torvalds (pre-git)42074.60%323.08%


Finn Thain6711.90%430.77%


Stephen Hemminger6511.55%17.69%


Joe Perches40.71%215.38%


Randy Dunlap30.53%17.69%


Alexander Beregalov20.36%17.69%


Geert Uytterhoeven20.36%17.69%


Total563100.00%13100.00%



/* Open/initialize the board.  This is called (in the current kernel)
   sometime after booting when the 'ifconfig' program is run.

   This routine should set everything up anew at each open, even
   registers that "should" only need to be set once at boot, so that
   there is non-reboot way to recover if something goes wrong.
   */


static int

net_open(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	int i;

	/* Disable the interrupt for now */
	writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL) & ~ENABLE_IRQ);

	/* Grab the interrupt */
	if (request_irq(dev->irq, net_interrupt, 0, "cs89x0", dev))
		return -EAGAIN;

	/* Set up the IRQ - Apparently magic */
	if (lp->chip_type == CS8900)
		writereg(dev, PP_CS8900_ISAINT, 0);
	else
		writereg(dev, PP_CS8920_ISAINT, 0);

	/* set the Ethernet address */
	for (i=0; i < ETH_ALEN/2; i++)
		writereg(dev, PP_IA+i*2, dev->dev_addr[i*2] | (dev->dev_addr[i*2+1] << 8));

	/* Turn on both receive and transmit operations */
	writereg(dev, PP_LineCTL, readreg(dev, PP_LineCTL) | SERIAL_RX_ON | SERIAL_TX_ON);

	/* Receive only error free packets addressed to this card */
	lp->rx_mode = 0;
	writereg(dev, PP_RxCTL, DEF_RX_ACCEPT);

	lp->curr_rx_cfg = RX_OK_ENBL | RX_CRC_ERROR_ENBL;

	writereg(dev, PP_RxCFG, lp->curr_rx_cfg);

	writereg(dev, PP_TxCFG, TX_LOST_CRS_ENBL | TX_SQE_ERROR_ENBL | TX_OK_ENBL |
	       TX_LATE_COL_ENBL | TX_JBR_ENBL | TX_ANY_COL_ENBL | TX_16_COL_ENBL);

	writereg(dev, PP_BufCFG, READY_FOR_TX_ENBL | RX_MISS_COUNT_OVRFLOW_ENBL |
		 TX_COL_COUNT_OVRFLOW_ENBL | TX_UNDERRUN_ENBL);

	/* now that we've got our act together, enable everything */
	writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL) | ENABLE_IRQ);
	netif_start_queue(dev);
	return 0;
}


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Randy Dunlap31.16%133.33%


Total258100.00%3100.00%





static int

net_send_packet(struct sk_buff *skb, struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	unsigned long flags;

	netif_dbg(lp, tx_queued, dev, "sent %d byte packet of type %x\n",
		  skb->len, skb->data[ETH_ALEN + ETH_ALEN] << 8 |
		  skb->data[ETH_ALEN + ETH_ALEN + 1]);

	/* keep the upload from being interrupted, since we
           ask the chip to start transmitting before the
           whole packet has been completely uploaded. */
	local_irq_save(flags);
	netif_stop_queue(dev);

	/* initiate a transmit sequence */
	writereg(dev, PP_TxCMD, lp->send_cmd);
	writereg(dev, PP_TxLength, skb->len);

	/* Test to see if the chip has allocated memory for the packet */
	if ((readreg(dev, PP_BusST) & READY_FOR_TX_NOW) == 0) {
		/* Gasp!  It hasn't.  But that shouldn't happen since
                   we're waiting for TxOk, so return 1 and requeue this packet. */
		local_irq_restore(flags);
		return NETDEV_TX_BUSY;
	}

	/* Write the contents of the packet */
	skb_copy_from_linear_data(skb, (void *)(dev->mem_start + PP_TxFrame),
				  skb->len+1);

	local_irq_restore(flags);
	dev_kfree_skb (skb);

	return NETDEV_TX_OK;
}


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Linus Torvalds (pre-git)13581.82%114.29%


Matthias Urlichs169.70%114.29%


Finn Thain63.64%114.29%


Randy Dunlap31.82%114.29%


Geert Uytterhoeven31.82%114.29%


Patrick McHardy21.21%228.57%


Total165100.00%7100.00%



/* The typical workload of the driver:
   Handle the network interface interrupts. */



static irqreturn_t net_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct net_local *lp;
	int ioaddr, status;

	ioaddr = dev->base_addr;
	lp = netdev_priv(dev);

	/* we MUST read all the events out of the ISQ, otherwise we'll never
           get interrupted again.  As a consequence, we can't have any limit
           on the number of times we loop in the interrupt handler.  The
           hardware guarantees that eventually we'll run out of events.  Of
           course, if you're on a slow machine, and packets are arriving
           faster than you can read them off, you're screwed.  Hasta la
           vista, baby!  */
	while ((status = swab16(nubus_readw(dev->base_addr + ISQ_PORT)))) {
		netif_dbg(lp, intr, dev, "status=%04x\n", status);
		switch(status & ISQ_EVENT_MASK) {
		case ISQ_RECEIVER_EVENT:
			/* Got a packet(s). */
			net_rx(dev);
			break;
		case ISQ_TRANSMITTER_EVENT:
			dev->stats.tx_packets++;
			netif_wake_queue(dev);
			if ((status & TX_OK) == 0)
				dev->stats.tx_errors++;
			if (status & TX_LOST_CRS)
				dev->stats.tx_carrier_errors++;
			if (status & TX_SQE_ERROR)
				dev->stats.tx_heartbeat_errors++;
			if (status & TX_LATE_COL)
				dev->stats.tx_window_errors++;
			if (status & TX_16_COL)
				dev->stats.tx_aborted_errors++;
			break;
		case ISQ_BUFFER_EVENT:
			if (status & READY_FOR_TX) {
				/* we tried to transmit a packet earlier,
                                   but inexplicably ran out of buffers.
                                   That shouldn't happen since we only ever
                                   load one packet.  Shrug.  Do the right
                                   thing anyway. */
				netif_wake_queue(dev);
			}
			if (status & TX_UNDERRUN) {
				netif_dbg(lp, tx_err, dev, "transmit underrun\n");
                                lp->send_underrun++;
                                if (lp->send_underrun == 3) lp->send_cmd = TX_AFTER_381;
                                else if (lp->send_underrun == 6) lp->send_cmd = TX_AFTER_ALL;
                        }
			break;
		case ISQ_RX_MISS_EVENT:
			dev->stats.rx_missed_errors += (status >> 6);
			break;
		case ISQ_TX_COL_EVENT:
			dev->stats.collisions += (status >> 6);
			break;
		}
	}
	return IRQ_HANDLED;
}


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Finn Thain124.20%114.29%


Vasiliy Kulikov82.80%114.29%


Matthias Urlichs41.40%114.29%


Andrew Morton41.40%114.29%


Randy Dunlap31.05%114.29%


Geert Uytterhoeven10.35%114.29%


Total286100.00%7100.00%



/* We have a good packet(s), get it/them out of the buffers. */


static void

net_rx(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	struct sk_buff *skb;
	int status, length;

	status = readreg(dev, PP_RxStatus);
	if ((status & RX_OK) == 0) {
		dev->stats.rx_errors++;
		if (status & RX_RUNT)
				dev->stats.rx_length_errors++;
		if (status & RX_EXTRA_DATA)
				dev->stats.rx_length_errors++;
		if ((status & RX_CRC_ERROR) &&
		    !(status & (RX_EXTRA_DATA|RX_RUNT)))
			/* per str 172 */
			dev->stats.rx_crc_errors++;
		if (status & RX_DRIBBLE)
				dev->stats.rx_frame_errors++;
		return;
	}

	length = readreg(dev, PP_RxLength);
	/* Malloc up new buffer. */
	skb = alloc_skb(length, GFP_ATOMIC);
	if (skb == NULL) {
		dev->stats.rx_dropped++;
		return;
	}
	skb_put(skb, length);

	skb_copy_to_linear_data(skb, (void *)(dev->mem_start + PP_RxFrame),
				length);

	netif_dbg(lp, rx_status, dev, "received %d byte packet of type %x\n",
		  length, skb->data[ETH_ALEN + ETH_ALEN] << 8 |
		  skb->data[ETH_ALEN + ETH_ALEN + 1]);

        skb->protocol=eth_type_trans(skb,dev);
	netif_rx(skb);
	dev->stats.rx_packets++;
	dev->stats.rx_bytes += length;
}


Contributors
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Linus Torvalds (pre-git)21484.58%116.67%


Finn Thain166.32%116.67%


Vasiliy Kulikov114.35%116.67%


Matthias Urlichs72.77%116.67%


Linus Torvalds51.98%233.33%


Total253100.00%6100.00%



/* The inverse routine to net_open(). */


static int

net_close(struct net_device *dev)
{

	writereg(dev, PP_RxCFG, 0);
	writereg(dev, PP_TxCFG, 0);
	writereg(dev, PP_BufCFG, 0);
	writereg(dev, PP_BusCTL, 0);

	netif_stop_queue(dev);

	free_irq(dev->irq, dev);

	/* Update the statistics here. */

	return 0;

}


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Linus Torvalds (pre-git)65100.00%2100.00%


Total65100.00%2100.00%



/* Get the current statistics.  This may be called with the card open or
   closed. */


static struct net_device_stats *

net_get_stats(struct net_device *dev)
{
	unsigned long flags;

	local_irq_save(flags);
	/* Update the statistics from the device registers. */
	dev->stats.rx_missed_errors += (readreg(dev, PP_RxMiss) >> 6);
	dev->stats.collisions += (readreg(dev, PP_TxCol) >> 6);
	local_irq_restore(flags);

	return &dev->stats;
}


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Linus Torvalds (pre-git)5276.47%125.00%


Linus Torvalds1116.18%125.00%


Vasiliy Kulikov34.41%125.00%


Geert Uytterhoeven22.94%125.00%


Total68100.00%4100.00%






static void set_multicast_list(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);

	if(dev->flags&IFF_PROMISC)
	{
		lp->rx_mode = RX_ALL_ACCEPT;
	} else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev)) {
		/* The multicast-accept list is initialized to accept-all, and we
                   rely on higher-level filtering for now. */
		lp->rx_mode = RX_MULTCAST_ACCEPT;
	}
	else
		lp->rx_mode = 0;

	writereg(dev, PP_RxCTL, DEF_RX_ACCEPT | lp->rx_mode);

	/* in promiscuous mode, we accept errored packets, so we have to enable interrupts on them also */
	writereg(dev, PP_RxCFG, lp->curr_rx_cfg |
	     (lp->rx_mode == RX_ALL_ACCEPT? (RX_CRC_ERROR_ENBL|RX_RUNT_ENBL|RX_EXTRA_DATA_ENBL) : 0));
}



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Jiri Pirko43.54%133.33%


Randy Dunlap32.65%133.33%


Total113100.00%3100.00%






static int set_mac_address(struct net_device *dev, void *addr)
{
	struct sockaddr *saddr = addr;
	int i;

	if (!is_valid_ether_addr(saddr->sa_data))
		return -EADDRNOTAVAIL;

	memcpy(dev->dev_addr, saddr->sa_data, ETH_ALEN);
	netdev_info(dev, "Setting MAC address to %pM\n", dev->dev_addr);

	/* set the Ethernet address */
	for (i=0; i < ETH_ALEN/2; i++)
		writereg(dev, PP_IA+i*2, dev->dev_addr[i*2] | (dev->dev_addr[i*2+1] << 8));

	return 0;
}


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Linus Torvalds (pre-git)8169.23%125.00%


Danny Kukawka2823.93%125.00%


David S. Miller54.27%125.00%


Finn Thain32.56%125.00%


Total117100.00%4100.00%



MODULE_LICENSE("GPL");




static int mac89x0_device_remove(struct platform_device *pdev)
{
	struct net_device *dev = platform_get_drvdata(pdev);

	unregister_netdev(dev);
	nubus_writew(0, dev->base_addr + ADD_PORT);
	free_netdev(dev);
	return 0;
}


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Finn Thain2044.44%120.00%


Linus Torvalds (pre-git)1635.56%120.00%


Stephen Hemminger613.33%120.00%


Linus Torvalds24.44%120.00%


Geert Uytterhoeven12.22%120.00%


Total45100.00%5100.00%




static struct platform_driver mac89x0_platform_driver = {
	.probe = mac89x0_device_probe,
	.remove = mac89x0_device_remove,
	.driver = {
		.name = "mac89x0",
        },
};

module_platform_driver(mac89x0_platform_driver);

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Linus Torvalds (pre-git)192079.97%38.82%


Finn Thain1928.00%411.76%


Stephen Hemminger712.96%12.94%


Alexander Beregalov441.83%12.94%


Danny Kukawka281.17%12.94%


Matthias Urlichs271.12%12.94%


Linus Torvalds241.00%411.76%


Vasiliy Kulikov220.92%12.94%


Randy Dunlap150.62%12.94%


Geert Uytterhoeven150.62%25.88%


Arnaldo Carvalho de Melo80.33%12.94%


Andrew Morton50.21%12.94%


Jiri Pirko50.21%25.88%


David S. Miller50.21%12.94%


Dave Jones40.17%12.94%


Joe Perches40.17%25.88%


Nishanth Aravamudan30.12%12.94%


Tejun Heo30.12%12.94%


Patrick McHardy20.08%25.88%


Kees Cook20.08%12.94%


Jiri Slaby10.04%12.94%


Jeff Garzik10.04%12.94%


David Howells0.00%00.00%


Total2401100.00%34100.00%


Directory: drivers/net/ethernet/cirrus



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