/** /proc/web100/<connection>/spec_ascii **/
static ssize_t connection_spec_ascii_read(struct file * file, char * buf,
size_t nbytes, loff_t *ppos)
{
__u32 local_addr, remote_addr;
__u16 local_port, remote_port;
int cid;
struct web100stats *stats;
struct web100directs *vars;
char tmpbuf[100];
int len = 0;
if (*ppos != 0)
return 0;
cid = cid_from_ino(file->f_dentry->d_parent->d_inode->i_ino);
read_lock_bh(&web100_linkage_lock);
stats = web100stats_lookup(cid);
read_unlock_bh(&web100_linkage_lock);
if (stats == NULL)
return -ENOENT;
vars = &stats->wc_vars;
if (vars->LocalAddressType == WC_ADDRTYPE_IPV4) {
/* These values should not change while stats are linked.
* We don't need to lock the sock. */
local_addr = ntohl(vars->LocalAddress.v4addr);
remote_addr = ntohl(vars->RemAddress.v4addr);
local_port = vars->LocalPort;
remote_port = vars->RemPort;
len = sprintf(tmpbuf, "%d.%d.%d.%d:%d %d.%d.%d.%d:%d\n",
(local_addr >> 24) & 0xff,
(local_addr >> 16) & 0xff,
(local_addr >> 8) & 0xff,
local_addr & 0xff,
local_port,
(remote_addr >> 24) & 0xff,
(remote_addr >> 16) & 0xff,
(remote_addr >> 8) & 0xff,
remote_addr & 0xff,
remote_port);
} else if (vars->LocalAddressType == WC_ADDRTYPE_IPV6) {
static int pool_change(ip_pool_t index, u_int32_t addr, int isdel)
{
struct ip_pool *pool;
int res = -1;
pool = lookup(index);
if ( !pool || !pool->members
|| addr < pool->first_ip || addr > pool->last_ip)
return -1;
read_lock_bh(&pool->lock);
if (pool->members && addr >= pool->first_ip && addr <= pool->last_ip) {
addr -= pool->first_ip;
res = isdel
? (0 != test_and_clear_bit(addr, pool->members))
: (0 != test_and_set_bit(addr, pool->members));
}
read_unlock_bh(&pool->lock);
return res;
}
static void
bitmap_ip_gc(unsigned long ul_set)
{
struct ip_set *set = (struct ip_set *) ul_set;
struct bitmap_ip *map = set->data;
unsigned long *table = map->members;
u32 id;
/* We run parallel with other readers (test element)
* but adding/deleting new entries is locked out */
read_lock_bh(&set->lock);
for (id = 0; id < map->elements; id++)
if (ip_set_timeout_expired(table[id]))
table[id] = IPSET_ELEM_UNSET;
read_unlock_bh(&set->lock);
map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ;
add_timer(&map->gc);
}
static int tcp_to_nfattr(struct sk_buff *skb, struct nfattr *nfa,
const struct nf_conn *ct)
{
struct nfattr *nest_parms;
read_lock_bh(&tcp_lock);
nest_parms = NFA_NEST(skb, CTA_PROTOINFO_TCP);
NFA_PUT(skb, CTA_PROTOINFO_TCP_STATE, sizeof(u_int8_t),
&ct->proto.tcp.state);
read_unlock_bh(&tcp_lock);
NFA_NEST_END(skb, nest_parms);
return 0;
nfattr_failure:
read_unlock_bh(&tcp_lock);
return -1;
}
static in_cache_entry *in_cache_get_by_vcc(struct atm_vcc *vcc,
struct mpoa_client *client)
{
in_cache_entry *entry;
read_lock_bh(&client->ingress_lock);
entry = client->in_cache;
while (entry != NULL) {
if (entry->shortcut == vcc) {
atomic_inc(&entry->use);
read_unlock_bh(&client->ingress_lock);
return entry;
}
entry = entry->next;
}
read_unlock_bh(&client->ingress_lock);
return NULL;
}
static inline int ip6_output_finish(struct sk_buff *skb)
{
struct dst_entry *dst = skb->dst;
struct hh_cache *hh = dst->hh;
if (hh) {
read_lock_bh(&hh->hh_lock);
memcpy(skb->data - 16, hh->hh_data, 16);
read_unlock_bh(&hh->hh_lock);
skb_push(skb, hh->hh_len);
return hh->hh_output(skb);
} else if (dst->neighbour)
return dst->neighbour->output(skb);
kfree_skb(skb);
return -EINVAL;
}
struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev)
{
struct inet6_ifaddr * ifp;
u8 hash = ipv6_addr_hash(addr);
read_lock_bh(&addrconf_hash_lock);
for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
if (ipv6_addr_cmp(&ifp->addr, addr) == 0) {
if (dev == NULL || ifp->idev->dev == dev ||
!(ifp->scope&(IFA_LINK|IFA_HOST))) {
in6_ifa_hold(ifp);
break;
}
}
}
read_unlock_bh(&addrconf_hash_lock);
return ifp;
}
/*
* Unfortunately, the neighbour code uses the device in its hash
* function, so we don't get any advantage from it. This function
* basically does a neigh_lookup(), but without comparing the device
* field. This is required for the On-Ethernet cache
*/
struct neighbour *dn_neigh_lookup(struct neigh_table *tbl, const void *ptr)
{
struct neighbour *neigh;
u32 hash_val;
hash_val = tbl->hash(ptr, NULL);
read_lock_bh(&tbl->lock);
for(neigh = tbl->hash_buckets[hash_val]; neigh != NULL; neigh = neigh->next) {
if (memcmp(neigh->primary_key, ptr, tbl->key_len) == 0) {
atomic_inc(&neigh->refcnt);
read_unlock_bh(&tbl->lock);
return neigh;
}
}
read_unlock_bh(&tbl->lock);
return NULL;
}
static void smc_lgr_free_work(struct work_struct *work)
{
struct smc_link_group *lgr = container_of(to_delayed_work(work),
struct smc_link_group,
free_work);
bool conns;
spin_lock_bh(&smc_lgr_list.lock);
if (list_empty(&lgr->list))
goto free;
read_lock_bh(&lgr->conns_lock);
conns = RB_EMPTY_ROOT(&lgr->conns_all);
read_unlock_bh(&lgr->conns_lock);
if (!conns) { /* number of lgr connections is no longer zero */
spin_unlock_bh(&smc_lgr_list.lock);
return;
}
list_del_init(&lgr->list); /* remove from smc_lgr_list */
free:
spin_unlock_bh(&smc_lgr_list.lock);
if (!lgr->is_smcd && !lgr->terminating) {
struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK];
/* try to send del link msg, on error free lgr immediately */
if (lnk->state == SMC_LNK_ACTIVE &&
!smc_link_send_delete(lnk)) {
/* reschedule in case we never receive a response */
smc_lgr_schedule_free_work(lgr);
return;
}
}
if (!delayed_work_pending(&lgr->free_work)) {
struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK];
if (!lgr->is_smcd && lnk->state != SMC_LNK_INACTIVE)
smc_llc_link_inactive(lnk);
if (lgr->is_smcd)
smc_ism_signal_shutdown(lgr);
smc_lgr_free(lgr);
}
}
static struct dst_entry *
__xfrm4_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
{
struct dst_entry *dst;
read_lock_bh(&policy->lock);
for (dst = policy->bundles; dst; dst = dst->next) {
struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
if (xdst->u.rt.fl.oif == fl->oif && /*XXX*/
xdst->u.rt.fl.fl4_dst == fl->fl4_dst &&
xdst->u.rt.fl.fl4_src == fl->fl4_src &&
xfrm_bundle_ok(xdst, fl, AF_INET)) {
dst_clone(dst);
break;
}
}
read_unlock_bh(&policy->lock);
return dst;
}
static int arp_req_get(struct arpreq *r, struct net_device *dev)
{
__be32 ip = ((struct sockaddr_in *) &r->arp_pa)->sin_addr.s_addr;
struct neighbour *neigh;
int err = -ENXIO;
neigh = neigh_lookup(&arp_tbl, &ip, dev);
if (neigh) {
read_lock_bh(&neigh->lock);
memcpy(r->arp_ha.sa_data, neigh->ha, dev->addr_len);
r->arp_flags = arp_state_to_flags(neigh);
read_unlock_bh(&neigh->lock);
r->arp_ha.sa_family = dev->type;
strlcpy(r->arp_dev, dev->name, sizeof(r->arp_dev));
neigh_release(neigh);
err = 0;
}
return err;
}
static in_cache_entry *in_cache_get(__be32 dst_ip,
struct mpoa_client *client)
{
in_cache_entry *entry;
read_lock_bh(&client->ingress_lock);
entry = client->in_cache;
while (entry != NULL) {
if (entry->ctrl_info.in_dst_ip == dst_ip) {
atomic_inc(&entry->use);
read_unlock_bh(&client->ingress_lock);
return entry;
}
entry = entry->next;
}
read_unlock_bh(&client->ingress_lock);
return NULL;
}
/* Stolen from ip6_output_finish
* PRE : skb->dev is set to the device we are leaving by
* skb->dst is not NULL
* POST: the packet is sent with the link layer header pushed
* the packet is destroyed
*/
static void ip_direct_send(struct sk_buff *skb)
{
struct dst_entry *dst = skb->dst;
struct hh_cache *hh = dst->hh;
if (hh) {
read_lock_bh(&hh->hh_lock);
memcpy(skb->data - 16, hh->hh_data, 16);
read_unlock_bh(&hh->hh_lock);
skb_push(skb, hh->hh_len);
hh->hh_output(skb);
} else if (dst->neighbour)
dst->neighbour->output(skb);
else {
if (net_ratelimit())
DEBUGP(KERN_DEBUG "ip6t_ROUTE: no hdr & no neighbour cache!\n");
kfree_skb(skb);
}
}
/*
* Called when the host's ARP layer makes a change to some entry that is
* loaded into the HW L2 table.
*/
void t3_l2t_update(struct t3cdev *dev, struct neighbour *neigh)
{
struct l2t_entry *e;
struct sk_buff *arpq = NULL;
struct l2t_data *d = L2DATA(dev);
u32 addr = *(u32 *) neigh->primary_key;
int ifidx = neigh->dev->ifindex;
int hash = arp_hash(addr, ifidx, d);
read_lock_bh(&d->lock);
for (e = d->l2tab[hash].first; e; e = e->next)
if (e->addr == addr && e->ifindex == ifidx) {
spin_lock(&e->lock);
goto found;
}
read_unlock_bh(&d->lock);
return;
found:
read_unlock(&d->lock);
if (atomic_read(&e->refcnt)) {
if (neigh != e->neigh)
neigh_replace(e, neigh);
if (e->state == L2T_STATE_RESOLVING) {
if (neigh->nud_state & NUD_FAILED) {
arpq = e->arpq_head;
e->arpq_head = e->arpq_tail = NULL;
} else if (neigh->nud_state & (NUD_CONNECTED|NUD_STALE))
setup_l2e_send_pending(dev, NULL, e);
} else {
e->state = neigh->nud_state & NUD_CONNECTED ?
L2T_STATE_VALID : L2T_STATE_STALE;
if (memcmp(e->dmac, neigh->ha, 6))
setup_l2e_send_pending(dev, NULL, e);
}
}
spin_unlock_bh(&e->lock);
if (arpq)
handle_failed_resolution(dev, arpq);
}
/* Do some firewalling */
unsigned int ebt_do_table (unsigned int hook, struct sk_buff **pskb,
const struct net_device *in, const struct net_device *out,
struct ebt_table *table)
{
int i, nentries;
struct ebt_entry *point;
struct ebt_counter *counter_base, *cb_base;
struct ebt_entry_target *t;
int verdict, sp = 0;
struct ebt_chainstack *cs;
struct ebt_entries *chaininfo;
char *base;
struct ebt_table_info *private = table->private;
read_lock_bh(&table->lock);
cb_base = COUNTER_BASE(private->counters, private->nentries,
smp_processor_id());
if (private->chainstack)
cs = private->chainstack[smp_processor_id()];
else
struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label)
{
struct ipv6_fl_socklist *sfl;
struct ipv6_pinfo *np = inet6_sk(sk);
label &= IPV6_FLOWLABEL_MASK;
read_lock_bh(&ip6_sk_fl_lock);
for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) {
struct ip6_flowlabel *fl = sfl->fl;
if (fl->label == label) {
fl->lastuse = jiffies;
atomic_inc(&fl->users);
read_unlock_bh(&ip6_sk_fl_lock);
return fl;
}
}
read_unlock_bh(&ip6_sk_fl_lock);
return NULL;
}
/*
* check if the interface/address pair is valid
*/
int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *addr)
{
struct inet6_dev *idev;
struct ifmcaddr6 *mc;
idev = in6_dev_get(dev);
if (idev) {
read_lock_bh(&idev->lock);
for (mc = idev->mc_list; mc; mc=mc->next) {
if (ipv6_addr_cmp(&mc->mca_addr, addr) == 0) {
read_unlock_bh(&idev->lock);
in6_dev_put(idev);
return 1;
}
}
read_unlock_bh(&idev->lock);
in6_dev_put(idev);
}
return 0;
}
struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr,
int oif, int flags)
{
struct fib6_node *fn;
struct rt6_info *rt;
read_lock_bh(&rt6_lock);
fn = fib6_lookup(&ip6_routing_table, daddr, saddr);
rt = rt6_device_match(fn->leaf, oif, !!(flags & RT6_LOOKUP_FLAG_STRICT));
dst_hold(&rt->u.dst);
rt->u.dst.__use++;
read_unlock_bh(&rt6_lock);
if (!(flags & RT6_LOOKUP_FLAG_NOUSE))
rt->u.dst.lastuse = jiffies;
if (rt->u.dst.error == 0)
return rt;
dst_release(&rt->u.dst);
return NULL;
}
static int dccp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
const struct nf_conn *ct)
{
struct nlattr *nest_parms;
read_lock_bh(&dccp_lock);
nest_parms = nla_nest_start(skb, CTA_PROTOINFO_DCCP | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
NLA_PUT_U8(skb, CTA_PROTOINFO_DCCP_STATE, ct->proto.dccp.state);
NLA_PUT_U8(skb, CTA_PROTOINFO_DCCP_ROLE,
ct->proto.dccp.role[IP_CT_DIR_ORIGINAL]);
nla_nest_end(skb, nest_parms);
read_unlock_bh(&dccp_lock);
return 0;
nla_put_failure:
read_unlock_bh(&dccp_lock);
return -1;
}
static in_cache_entry *in_cache_get_with_mask(uint32_t dst_ip,
struct mpoa_client *client,
uint32_t mask)
{
in_cache_entry *entry;
read_lock_bh(&client->ingress_lock);
entry = client->in_cache;
while(entry != NULL){
if((entry->ctrl_info.in_dst_ip & mask) == (dst_ip & mask )){
atomic_inc(&entry->use);
read_unlock_bh(&client->ingress_lock);
return entry;
}
entry = entry->next;
}
read_unlock_bh(&client->ingress_lock);
return NULL;
}
/* Stolen from ip_finish_output2 */
static void ip_direct_send(struct sk_buff *skb)
{
struct dst_entry *dst = skb->dst;
struct hh_cache *hh = dst->hh;
if (hh) {
int hh_alen;
read_lock_bh(&hh->hh_lock);
hh_alen = HH_DATA_ALIGN(hh->hh_len);
memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
read_unlock_bh(&hh->hh_lock);
skb_push(skb, hh->hh_len);
hh->hh_output(skb);
} else if (dst->neighbour)
dst->neighbour->output(skb);
else {
printk(KERN_DEBUG "khm in MIRROR\n");
kfree_skb(skb);
}
}
s32 mpls_vpws_output(struct sk_buff * skb)
{
s32 ret = 0;
struct mpls_vpws_table * vpws ;
struct mpls_vpws_net * vpws_net;
if(!(vpws_net = skb->dev->vpws_info))
return MPLS_L2VPN_IGNORE;
MPLS_DEBUG_COUNTER_INC(vpws_output);
read_lock_bh(&vpws_net->lock);
vpws = &vpws_net->vpws;
ret = mpls_vpws_xmit(skb, vpws);
read_unlock_bh(&vpws_net->lock);
return ret;
}
/* ----- Proc fs support ------ */
static int l2cap_sock_dump(char *buf, struct bluez_sock_list *list)
{
struct l2cap_pinfo *pi;
struct sock *sk;
char *ptr = buf;
read_lock_bh(&list->lock);
for (sk = list->head; sk; sk = sk->next) {
pi = l2cap_pi(sk);
ptr += sprintf(ptr, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d 0x%x\n",
batostr(&bluez_pi(sk)->src), batostr(&bluez_pi(sk)->dst),
sk->state, pi->psm, pi->scid, pi->dcid, pi->imtu, pi->omtu,
pi->link_mode);
}
read_unlock_bh(&list->lock);
ptr += sprintf(ptr, "\n");
return ptr - buf;
}
static int lowpan_ndisc_opt_addr_space(const struct net_device *dev,
u8 icmp6_type, struct neighbour *neigh,
u8 *ha_buf, u8 **ha)
{
struct lowpan_802154_neigh *n;
struct wpan_dev *wpan_dev;
int addr_space = 0;
if (!lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154))
return 0;
switch (icmp6_type) {
case NDISC_REDIRECT:
n = lowpan_802154_neigh(neighbour_priv(neigh));
read_lock_bh(&neigh->lock);
if (lowpan_802154_is_valid_src_short_addr(n->short_addr)) {
memcpy(ha_buf, &n->short_addr,
IEEE802154_SHORT_ADDR_LEN);
read_unlock_bh(&neigh->lock);
addr_space += __ndisc_opt_addr_space(IEEE802154_SHORT_ADDR_LEN, 0);
*ha = ha_buf;
} else {
read_unlock_bh(&neigh->lock);
}
break;
case NDISC_NEIGHBOUR_ADVERTISEMENT:
case NDISC_NEIGHBOUR_SOLICITATION:
case NDISC_ROUTER_SOLICITATION:
wpan_dev = lowpan_802154_dev(dev)->wdev->ieee802154_ptr;
if (lowpan_802154_is_valid_src_short_addr(wpan_dev->short_addr))
addr_space = __ndisc_opt_addr_space(IEEE802154_SHORT_ADDR_LEN, 0);
break;
default:
break;
}
return addr_space;
}
static bool
match(const struct sk_buff *skb, struct xt_action_param *par)
{
const struct xt_helper_info *info = par->matchinfo;
struct nf_conn *ct;
struct nf_conn_help *master_help;
enum ip_conntrack_info ctinfo;
bool ret = info->invert;
ct = nf_ct_get((struct sk_buff *)skb, &ctinfo);
if (!ct) {
DEBUGP("xt_helper: Eek! invalid conntrack?\n");
return ret;
}
if (!ct->master) {
DEBUGP("xt_helper: conntrack %p has no master\n", ct);
return ret;
}
read_lock_bh(&nf_conntrack_lock);
master_help = nfct_help(ct->master);
if (!master_help || !master_help->helper) {
DEBUGP("xt_helper: master ct %p has no helper\n",
exp->expectant);
goto out_unlock;
}
DEBUGP("master's name = %s , info->name = %s\n",
ct->master->helper->name, info->name);
if (info->name[0] == '\0')
ret = !ret;
else
ret ^= !strncmp(master_help->helper->name, info->name,
strlen(master_help->helper->name));
out_unlock:
read_unlock_bh(&nf_conntrack_lock);
return ret;
}
static void
bitmap_ipmac_gc(unsigned long ul_set)
{
struct ip_set *set = (struct ip_set *) ul_set;
struct bitmap_ipmac *map = set->data;
struct ipmac_telem *elem;
u32 id, last = map->last_ip - map->first_ip;
/* We run parallel with other readers (test element)
* but adding/deleting new entries is locked out */
read_lock_bh(&set->lock);
for (id = 0; id <= last; id++) {
elem = bitmap_ipmac_elem(map, id);
if (elem->match == MAC_FILLED &&
ip_set_timeout_expired(elem->timeout))
elem->match = MAC_EMPTY;
}
read_unlock_bh(&set->lock);
map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ;
add_timer(&map->gc);
}
int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
{
struct inet6_dev *idev;
int err = -EADDRNOTAVAIL;
read_lock(&addrconf_lock);
if ((idev = __in6_dev_get(dev)) != NULL) {
struct inet6_ifaddr *ifp;
read_lock_bh(&idev->lock);
for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
ipv6_addr_copy(addr, &ifp->addr);
err = 0;
break;
}
}
read_unlock_bh(&idev->lock);
}
read_unlock(&addrconf_lock);
return err;
}
static inline int lapd_pass_frame_to_socket_te(
struct sk_buff *skb)
{
struct sock *sk;
struct hlist_node *node;
struct lapd_data_hdr *hdr = (struct lapd_data_hdr *)skb->data;
struct lapd_device *dev = to_lapd_dev(skb->dev);
int queued = 0;
read_lock_bh(&lapd_hash_lock);
sk_for_each(sk, node, lapd_get_hash(dev)) {
struct lapd_sock *lapd_sock = to_lapd_sock(sk);
if (lapd_sock->dev == dev &&
(sk->sk_state == LAPD_SK_STATE_NORMAL_DLC ||
sk->sk_state == LAPD_SK_STATE_BROADCAST_DLC) &&
lapd_sock->sapi == hdr->addr.sapi &&
lapd_sock->tei == hdr->addr.tei) {
struct sk_buff *new_skb;
if (!queued) {
new_skb = skb;
queued = TRUE;
} else {
new_skb = skb_clone(skb, GFP_ATOMIC);
}
new_skb->sk = sk;
queued = lapd_pass_frame_to_socket(
to_lapd_sock(sk), new_skb);
}
}
read_unlock_bh(&lapd_hash_lock);
return queued;
}
/* Stolen from ip_finish_output2
* PRE : skb->dev is set to the device we are leaving by
* skb->dst is not NULL
* POST: the packet is sent with the link layer header pushed
* the packet is destroyed
*/
static void ip_direct_send(struct sk_buff *skb)
{
struct dst_entry *dst = skb->dst;
struct hh_cache *hh = dst->hh;
struct net_device *dev = dst->dev;
int hh_len = LL_RESERVED_SPACE(dev);
/* Be paranoid, rather than too clever. */
if (unlikely(skb_headroom(skb) < hh_len && dev->hard_header)) {
struct sk_buff *skb2;
skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
if (skb2 == NULL) {
kfree_skb(skb);
return;
}
if (skb->sk)
skb_set_owner_w(skb2, skb->sk);
kfree_skb(skb);
skb = skb2;
}
if (hh) {
int hh_alen;
read_lock_bh(&hh->hh_lock);
hh_alen = HH_DATA_ALIGN(hh->hh_len);
memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
read_unlock_bh(&hh->hh_lock);
skb_push(skb, hh->hh_len);
hh->hh_output(skb);
} else if (dst->neighbour)
dst->neighbour->output(skb);
else {
if (net_ratelimit())
DEBUGP(KERN_DEBUG "ipt_ROUTE: no hdr & no neighbour cache!\n");
kfree_skb(skb);
}
}
static void smc_lgr_free_work(struct work_struct *work)
{
struct smc_link_group *lgr = container_of(to_delayed_work(work),
struct smc_link_group,
free_work);
bool conns;
spin_lock_bh(&smc_lgr_list.lock);
if (list_empty(&lgr->list))
goto free;
read_lock_bh(&lgr->conns_lock);
conns = RB_EMPTY_ROOT(&lgr->conns_all);
read_unlock_bh(&lgr->conns_lock);
if (!conns) { /* number of lgr connections is no longer zero */
spin_unlock_bh(&smc_lgr_list.lock);
return;
}
list_del_init(&lgr->list); /* remove from smc_lgr_list */
free:
spin_unlock_bh(&smc_lgr_list.lock);
smc_lgr_free(lgr);
}