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tipc: Simplify bearer shutdown logic 

Optimize processing in TIPC's bearer shutdown code, including:

1. Remove an unnecessary check to see if TIPC bearer's can exist.
2. Don't release spinlocks before calling a media-specific disabling
routine, since the routine can't sleep.
3. Make bearer_disable() operate directly on a struct bearer, instead
of needlessly taking a name and then mapping that to the struct.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Reviewed-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Allan Stephens 2010-10-14 13:58:26 +00:00 committed by David S. Miller
parent 724829b3ad
commit ccc901ee58
1 changed files with 11 additions and 27 deletions
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38
net/tipc/bearer.c
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@ -288,9 +288,6 @@ static struct bearer *bearer_find(const char *name)
struct bearer *b_ptr;
u32 i;
if (tipc_mode != TIPC_NET_MODE)
return NULL;
for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
if (b_ptr->active && (!strcmp(b_ptr->publ.name, name)))
return b_ptr;
@ -630,30 +627,17 @@ int tipc_block_bearer(const char *name)
* Note: This routine assumes caller holds tipc_net_lock.
*/
static int bearer_disable(const char *name)
static int bearer_disable(struct bearer *b_ptr)
{
struct bearer *b_ptr;
struct link *l_ptr;
struct link *temp_l_ptr;
b_ptr = bearer_find(name);
if (!b_ptr) {
warn("Attempt to disable unknown bearer <%s>\n", name);
return -EINVAL;
}
info("Disabling bearer <%s>\n", name);
info("Disabling bearer <%s>\n", b_ptr->publ.name);
tipc_disc_stop_link_req(b_ptr->link_req);
spin_lock_bh(&b_ptr->publ.lock);
b_ptr->link_req = NULL;
b_ptr->publ.blocked = 1;
if (b_ptr->media->disable_bearer) {
spin_unlock_bh(&b_ptr->publ.lock);
write_unlock_bh(&tipc_net_lock);
b_ptr->media->disable_bearer(&b_ptr->publ);
write_lock_bh(&tipc_net_lock);
spin_lock_bh(&b_ptr->publ.lock);
}
b_ptr->media->disable_bearer(&b_ptr->publ);
list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
tipc_link_delete(l_ptr);
}
@ -664,10 +648,16 @@ static int bearer_disable(const char *name)
int tipc_disable_bearer(const char *name)
{
struct bearer *b_ptr;
int res;
write_lock_bh(&tipc_net_lock);
res = bearer_disable(name);
b_ptr = bearer_find(name);
if (b_ptr == NULL) {
warn("Attempt to disable unknown bearer <%s>\n", name);
res = -EINVAL;
} else
res = bearer_disable(b_ptr);
write_unlock_bh(&tipc_net_lock);
return res;
}
@ -680,13 +670,7 @@ void tipc_bearer_stop(void)
for (i = 0; i < MAX_BEARERS; i++) {
if (tipc_bearers[i].active)
tipc_bearers[i].publ.blocked = 1;
}
for (i = 0; i < MAX_BEARERS; i++) {
if (tipc_bearers[i].active)
bearer_disable(tipc_bearers[i].publ.name);
bearer_disable(&tipc_bearers[i]);
}
media_count = 0;
}