lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

tipc: Enhance handling of discovery object creation failures

Browse Source 
Modifies bearer creation and deletion code to improve handling of
scenarios when a neighbor discovery object cannot be created. The
creation routine now aborts the creation of a bearer if its discovery
object cannot be created, and deletes the newly created bearer, rather
than failing quietly and leaving an unusable bearer hanging around.

Since the exit via the goto label really isn't a definitive failure
in all cases, relabel it appropriately.

Signed-off-by: Allan Stephens <Allan.Stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
This commit is contained in:
Allan Stephens
2011-04-21 13:58:26 -05:00
committed by Paul Gortmaker
parent dc63d91eb1
commit 3a777ff8b1
3 changed files with 42 additions and 41 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
net/tipc/bearer.c
View File

@@ -46,6 +46,8 @@ static u32 media_count;
struct tipc_bearer tipc_bearers[MAX_BEARERS];
static void bearer_disable(struct tipc_bearer *b_ptr);
/**
* media_name_valid - validate media name
*
@@ -518,7 +520,7 @@ int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority)
if (!m_ptr) {
warn("Bearer <%s> rejected, media <%s> not registered\n", name,
b_name.media_name);
goto failed;
goto exit;
}
if (priority == TIPC_MEDIA_LINK_PRI)
@@ -534,14 +536,14 @@ restart:
}
if (!strcmp(name, tipc_bearers[i].name)) {
warn("Bearer <%s> rejected, already enabled\n", name);
goto failed;
goto exit;
}
if ((tipc_bearers[i].priority == priority) &&
(++with_this_prio > 2)) {
if (priority-- == 0) {
warn("Bearer <%s> rejected, duplicate priority\n",
name);
goto failed;
goto exit;
}
warn("Bearer <%s> priority adjustment required %u->%u\n",
name, priority + 1, priority);
@@ -551,7 +553,7 @@ restart:
if (bearer_id >= MAX_BEARERS) {
warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
name, MAX_BEARERS);
goto failed;
goto exit;
}
b_ptr = &tipc_bearers[bearer_id];
@@ -559,7 +561,7 @@ restart:
res = m_ptr->enable_bearer(b_ptr);
if (res) {
warn("Bearer <%s> rejected, enable failure (%d)\n", name, -res);
goto failed;
goto exit;
}
b_ptr->identity = bearer_id;
@@ -569,14 +571,18 @@ restart:
b_ptr->priority = priority;
INIT_LIST_HEAD(&b_ptr->cong_links);
INIT_LIST_HEAD(&b_ptr->links);
b_ptr->link_req = tipc_disc_init_link_req(b_ptr, &m_ptr->bcast_addr,
disc_domain);
spin_lock_init(&b_ptr->lock);
write_unlock_bh(&tipc_net_lock);
res = tipc_disc_create(b_ptr, &m_ptr->bcast_addr, disc_domain);
if (res) {
bearer_disable(b_ptr);
warn("Bearer <%s> rejected, discovery object creation failed\n",
name);
goto exit;
}
info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
name, tipc_addr_string_fill(addr_string, disc_domain), priority);
return 0;
failed:
exit:
write_unlock_bh(&tipc_net_lock);
return res;
}
@@ -627,14 +633,14 @@ static void bearer_disable(struct tipc_bearer *b_ptr)
struct link *temp_l_ptr;
info("Disabling bearer <%s>\n", b_ptr->name);
tipc_disc_stop_link_req(b_ptr->link_req);
spin_lock_bh(&b_ptr->lock);
b_ptr->link_req = NULL;
b_ptr->blocked = 1;
b_ptr->media->disable_bearer(b_ptr);
list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
tipc_link_delete(l_ptr);
}
if (b_ptr->link_req)
tipc_disc_delete(b_ptr->link_req);
spin_unlock_bh(&b_ptr->lock);
memset(b_ptr, 0, sizeof(struct tipc_bearer));
}