Commit de3cb747 authored by Daniel Lezcano's avatar Daniel Lezcano Committed by David S. Miller
Browse files

[NET]: Dynamically allocate the loopback device, part 1. 



This patch replaces all occurences to the static variable
loopback_dev to a pointer loopback_dev. That provides the
mindless, trivial, uninteressting change part for the dynamic
allocation for the loopback.

Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
Signed-off-by: default avatarDaniel Lezcano <dlezcano@fr.ibm.com>
Acked-By: default avatarKirill Korotaev <dev@sw.ru>
Acked-by: default avatarBenjamin Thery <benjamin.thery@bull.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 55682965

drivers/net/loopback.c

+4 −2
Original line number Diff line number Diff line
@@ -202,7 +202,7 @@ static const struct ethtool_ops loopback_ethtool_ops = { 
 * The loopback device is special. There is only one instance and

 * it is statically allocated. Don't do this for other devices.

 */

struct net_device loopback_dev = {

struct net_device __loopback_dev = {

	.name	 		= "lo",

	.get_stats		= &get_stats,

	.mtu			= (16 * 1024) + 20 + 20 + 12,
@@ -227,10 +227,12 @@ struct net_device loopback_dev = { 
	.nd_net                 = &init_net,

};



struct net_device *loopback_dev = &__loopback_dev;



/* Setup and register the loopback device. */

static int __init loopback_init(void)

{

	int err = register_netdev(&loopback_dev);

	int err = register_netdev(loopback_dev);



	if (err)

		panic("loopback: Failed to register netdevice: %d\n", err);

include/linux/netdevice.h

+1 −1
Original line number Diff line number Diff line
@@ -741,7 +741,7 @@ struct packet_type { 
#include <linux/interrupt.h>

#include <linux/notifier.h>



extern struct net_device		loopback_dev;		/* The loopback */

extern struct net_device		*loopback_dev;		/* The loopback */

extern rwlock_t				dev_base_lock;		/* Device list lock */

net/core/dst.c

+4 −4
Original line number Diff line number Diff line
@@ -278,13 +278,13 @@ static inline void dst_ifdown(struct dst_entry *dst, struct net_device *dev, 
	if (!unregister) {

		dst->input = dst->output = dst_discard;

	} else {

		dst->dev = &loopback_dev;

		dev_hold(&loopback_dev);

		dst->dev = loopback_dev;

		dev_hold(dst->dev);

		dev_put(dev);

		if (dst->neighbour && dst->neighbour->dev == dev) {

			dst->neighbour->dev = &loopback_dev;

			dst->neighbour->dev = loopback_dev;

			dev_put(dev);

			dev_hold(&loopback_dev);

			dev_hold(dst->neighbour->dev);

		}

	}

}

net/decnet/dn_dev.c

+2 −2
Original line number Diff line number Diff line
@@ -869,10 +869,10 @@ last_chance: 
		rv = dn_dev_get_first(dev, addr);

		read_unlock(&dev_base_lock);

		dev_put(dev);

		if (rv == 0 || dev == &loopback_dev)

		if (rv == 0 || dev == loopback_dev)

			return rv;

	}

	dev = &loopback_dev;

	dev = loopback_dev;

	dev_hold(dev);

	goto last_chance;

}

net/decnet/dn_route.c

+7 −7
Original line number Diff line number Diff line
@@ -887,7 +887,7 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *old 
					.scope = RT_SCOPE_UNIVERSE,

				     } },

			    .mark = oldflp->mark,

			    .iif = loopback_dev.ifindex,

			    .iif = loopback_dev->ifindex,

			    .oif = oldflp->oif };

	struct dn_route *rt = NULL;

	struct net_device *dev_out = NULL, *dev;
@@ -904,7 +904,7 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *old 
		       "dn_route_output_slow: dst=%04x src=%04x mark=%d"

		       " iif=%d oif=%d\n", dn_ntohs(oldflp->fld_dst),

		       dn_ntohs(oldflp->fld_src),

		       oldflp->mark, loopback_dev.ifindex, oldflp->oif);

		       oldflp->mark, loopback_dev->ifindex, oldflp->oif);



	/* If we have an output interface, verify its a DECnet device */

	if (oldflp->oif) {
@@ -957,7 +957,7 @@ source_ok: 
		err = -EADDRNOTAVAIL;

		if (dev_out)

			dev_put(dev_out);

		dev_out = &loopback_dev;

		dev_out = loopback_dev;

		dev_hold(dev_out);

		if (!fl.fld_dst) {

			fl.fld_dst =
@@ -966,7 +966,7 @@ source_ok: 
			if (!fl.fld_dst)

				goto out;

		}

		fl.oif = loopback_dev.ifindex;

		fl.oif = loopback_dev->ifindex;

		res.type = RTN_LOCAL;

		goto make_route;

	}
@@ -1012,7 +1012,7 @@ source_ok: 
					if (dev_out)

						dev_put(dev_out);

					if (dn_dev_islocal(neigh->dev, fl.fld_dst)) {

						dev_out = &loopback_dev;

						dev_out = loopback_dev;

						res.type = RTN_LOCAL;

					} else {

						dev_out = neigh->dev;
@@ -1033,7 +1033,7 @@ source_ok: 
		/* Possible improvement - check all devices for local addr */

		if (dn_dev_islocal(dev_out, fl.fld_dst)) {

			dev_put(dev_out);

			dev_out = &loopback_dev;

			dev_out = loopback_dev;

			dev_hold(dev_out);

			res.type = RTN_LOCAL;

			goto select_source;
@@ -1069,7 +1069,7 @@ select_source: 
			fl.fld_src = fl.fld_dst;

		if (dev_out)

			dev_put(dev_out);

		dev_out = &loopback_dev;

		dev_out = loopback_dev;

		dev_hold(dev_out);

		fl.oif = dev_out->ifindex;

		if (res.fi)

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