xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Bluetooth: convert conn hash to RCU

Browse Source 
Handling hci_conn_hash with RCU make us avoid some locking and disable
tasklets.

Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
This commit is contained in:
Gustavo F. Padovan
2011-12-14 22:54:12 -02:00
parent 8192edef03
commit bf4c632524
3 changed files with 62 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files

45
include/net/bluetooth/hci_core.h
View File

@@ -392,7 +392,7 @@ static inline void hci_conn_hash_init(struct hci_dev *hdev)
static inline void hci_conn_hash_add(struct hci_dev *hdev, struct hci_conn *c)
{
struct hci_conn_hash *h = &hdev->conn_hash;
list_add(&c->list, &h->list);
list_add_rcu(&c->list, &h->list);
switch (c->type) {
case ACL_LINK:
h->acl_num++;
@@ -410,7 +410,10 @@ static inline void hci_conn_hash_add(struct hci_dev *hdev, struct hci_conn *c)
static inline void hci_conn_hash_del(struct hci_dev *hdev, struct hci_conn *c)
{
struct hci_conn_hash *h = &hdev->conn_hash;
list_del(&c->list);
list_del_rcu(&c->list);
synchronize_rcu();
switch (c->type) {
case ACL_LINK:
h->acl_num--;
@@ -445,14 +448,18 @@ static inline struct hci_conn *hci_conn_hash_lookup_handle(struct hci_dev *hdev,
__u16 handle)
{
struct hci_conn_hash *h = &hdev->conn_hash;
struct list_head *p;
struct hci_conn *c;
list_for_each(p, &h->list) {
c = list_entry(p, struct hci_conn, list);
if (c->handle == handle)
rcu_read_lock();
list_for_each_entry_rcu(c, &h->list, list) {
if (c->handle == handle) {
rcu_read_unlock();
return c;
}
}
rcu_read_unlock();
return NULL;
}
@@ -460,14 +467,19 @@ static inline struct hci_conn *hci_conn_hash_lookup_ba(struct hci_dev *hdev,
__u8 type, bdaddr_t *ba)
{
struct hci_conn_hash *h = &hdev->conn_hash;
struct list_head *p;
struct hci_conn *c;
list_for_each(p, &h->list) {
c = list_entry(p, struct hci_conn, list);
if (c->type == type && !bacmp(&c->dst, ba))
rcu_read_lock();
list_for_each_entry_rcu(c, &h->list, list) {
if (c->type == type && !bacmp(&c->dst, ba)) {
rcu_read_unlock();
return c;
}
}
rcu_read_unlock();
return NULL;
}
@@ -475,14 +487,19 @@ static inline struct hci_conn *hci_conn_hash_lookup_state(struct hci_dev *hdev,
__u8 type, __u16 state)
{
struct hci_conn_hash *h = &hdev->conn_hash;
struct list_head *p;
struct hci_conn *c;
list_for_each(p, &h->list) {
c = list_entry(p, struct hci_conn, list);
if (c->type == type && c->state == state)
rcu_read_lock();
list_for_each_entry_rcu(c, &h->list, list) {
if (c->type == type && c->state == state) {
rcu_read_unlock();
return c;
}
}
rcu_read_unlock();
return NULL;
}