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authorYing Xue <ying.xue@windriver.com>2014-03-27 08:54:33 +0400
committerDavid S. Miller <davem@davemloft.net>2014-03-27 21:08:37 +0400
commit3874ccbba80f3b3127e94b1e055fb3d502a44718 (patch)
tree7a2e83182a543b53dfdca95f132e5463987576aa /net/tipc/bearer.c
parent78dfb789b69f161703ef322a0c2e3e61c7f7573a (diff)
downloadlinux-3874ccbba80f3b3127e94b1e055fb3d502a44718.tar.xz
tipc: convert tipc_bearers array to pointer list
As part of the effort to introduce RCU protection for the bearer list, we first need to change it to a list of pointers. Signed-off-by: Ying Xue <ying.xue@windriver.com> Reviewed-by: Erik Hugne <erik.hugne@ericsson.com> Reviewed-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc/bearer.c')
-rw-r--r--net/tipc/bearer.c46
1 files changed, 35 insertions, 11 deletions
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 7f1f95c57476..7ff98efd4890 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -49,7 +49,7 @@ static struct tipc_media * const media_info_array[] = {
NULL
};
-struct tipc_bearer tipc_bearers[MAX_BEARERS];
+struct tipc_bearer *bearer_list[MAX_BEARERS];
static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down);
@@ -177,8 +177,9 @@ struct tipc_bearer *tipc_bearer_find(const char *name)
struct tipc_bearer *b_ptr;
u32 i;
- for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
- if (b_ptr->active && (!strcmp(b_ptr->name, name)))
+ for (i = 0; i < MAX_BEARERS; i++) {
+ b_ptr = bearer_list[i];
+ if (b_ptr && b_ptr->active && (!strcmp(b_ptr->name, name)))
return b_ptr;
}
return NULL;
@@ -200,7 +201,9 @@ struct sk_buff *tipc_bearer_get_names(void)
read_lock_bh(&tipc_net_lock);
for (i = 0; media_info_array[i] != NULL; i++) {
for (j = 0; j < MAX_BEARERS; j++) {
- b = &tipc_bearers[j];
+ b = bearer_list[j];
+ if (!b)
+ continue;
if (b->active && (b->media == media_info_array[i])) {
tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
b->name,
@@ -284,16 +287,17 @@ restart:
bearer_id = MAX_BEARERS;
with_this_prio = 1;
for (i = MAX_BEARERS; i-- != 0; ) {
- if (!tipc_bearers[i].active) {
+ b_ptr = bearer_list[i];
+ if (!b_ptr || !b_ptr->active) {
bearer_id = i;
continue;
}
- if (!strcmp(name, tipc_bearers[i].name)) {
+ if (!strcmp(name, b_ptr->name)) {
pr_warn("Bearer <%s> rejected, already enabled\n",
name);
goto exit;
}
- if ((tipc_bearers[i].priority == priority) &&
+ if ((b_ptr->priority == priority) &&
(++with_this_prio > 2)) {
if (priority-- == 0) {
pr_warn("Bearer <%s> rejected, duplicate priority\n",
@@ -311,7 +315,11 @@ restart:
goto exit;
}
- b_ptr = &tipc_bearers[bearer_id];
+ b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC);
+ if (!b_ptr) {
+ res = -ENOMEM;
+ goto exit;
+ }
strcpy(b_ptr->name, name);
b_ptr->media = m_ptr;
res = m_ptr->enable_media(b_ptr);
@@ -335,6 +343,9 @@ restart:
name);
goto exit;
}
+
+ bearer_list[bearer_id] = b_ptr;
+
pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
name,
tipc_addr_string_fill(addr_string, disc_domain), priority);
@@ -362,13 +373,22 @@ static int tipc_reset_bearer(struct tipc_bearer *b_ptr)
*/
static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down)
{
+ u32 i;
+
pr_info("Disabling bearer <%s>\n", b_ptr->name);
b_ptr->media->disable_media(b_ptr);
tipc_link_delete_list(b_ptr->identity, shutting_down);
if (b_ptr->link_req)
tipc_disc_delete(b_ptr->link_req);
- memset(b_ptr, 0, sizeof(struct tipc_bearer));
+
+ for (i = 0; i < MAX_BEARERS; i++) {
+ if (b_ptr == bearer_list[i]) {
+ bearer_list[i] = NULL;
+ break;
+ }
+ }
+ kfree(b_ptr);
}
int tipc_disable_bearer(const char *name)
@@ -603,10 +623,14 @@ void tipc_bearer_cleanup(void)
void tipc_bearer_stop(void)
{
+ struct tipc_bearer *b_ptr;
u32 i;
for (i = 0; i < MAX_BEARERS; i++) {
- if (tipc_bearers[i].active)
- bearer_disable(&tipc_bearers[i], true);
+ b_ptr = bearer_list[i];
+ if (b_ptr && b_ptr->active) {
+ bearer_disable(b_ptr, true);
+ bearer_list[i] = NULL;
+ }
}
}